sched.h 100.7 KB
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#ifndef _LINUX_SCHED_H
#define _LINUX_SCHED_H

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#include <uapi/linux/sched.h>
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#include <linux/sched/prio.h>

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struct sched_param {
	int sched_priority;
};

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#include <asm/param.h>	/* for HZ */

#include <linux/capability.h>
#include <linux/threads.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/timex.h>
#include <linux/jiffies.h>
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#include <linux/plist.h>
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#include <linux/rbtree.h>
#include <linux/thread_info.h>
#include <linux/cpumask.h>
#include <linux/errno.h>
#include <linux/nodemask.h>
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#include <linux/mm_types.h>
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#include <linux/preempt.h>
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#include <asm/page.h>
#include <asm/ptrace.h>
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#include <linux/cputime.h>
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#include <linux/smp.h>
#include <linux/sem.h>
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#include <linux/shm.h>
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#include <linux/signal.h>
#include <linux/compiler.h>
#include <linux/completion.h>
#include <linux/pid.h>
#include <linux/percpu.h>
#include <linux/topology.h>
#include <linux/seccomp.h>
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#include <linux/rcupdate.h>
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#include <linux/rculist.h>
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#include <linux/rtmutex.h>
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#include <linux/time.h>
#include <linux/param.h>
#include <linux/resource.h>
#include <linux/timer.h>
#include <linux/hrtimer.h>
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#include <linux/kcov.h>
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#include <linux/task_io_accounting.h>
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#include <linux/latencytop.h>
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#include <linux/cred.h>
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#include <linux/llist.h>
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#include <linux/uidgid.h>
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#include <linux/gfp.h>
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#include <linux/magic.h>
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#include <linux/cgroup-defs.h>
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#include <asm/processor.h>
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#define SCHED_ATTR_SIZE_VER0	48	/* sizeof first published struct */

/*
 * Extended scheduling parameters data structure.
 *
 * This is needed because the original struct sched_param can not be
 * altered without introducing ABI issues with legacy applications
 * (e.g., in sched_getparam()).
 *
 * However, the possibility of specifying more than just a priority for
 * the tasks may be useful for a wide variety of application fields, e.g.,
 * multimedia, streaming, automation and control, and many others.
 *
 * This variant (sched_attr) is meant at describing a so-called
 * sporadic time-constrained task. In such model a task is specified by:
 *  - the activation period or minimum instance inter-arrival time;
 *  - the maximum (or average, depending on the actual scheduling
 *    discipline) computation time of all instances, a.k.a. runtime;
 *  - the deadline (relative to the actual activation time) of each
 *    instance.
 * Very briefly, a periodic (sporadic) task asks for the execution of
 * some specific computation --which is typically called an instance--
 * (at most) every period. Moreover, each instance typically lasts no more
 * than the runtime and must be completed by time instant t equal to
 * the instance activation time + the deadline.
 *
 * This is reflected by the actual fields of the sched_attr structure:
 *
 *  @size		size of the structure, for fwd/bwd compat.
 *
 *  @sched_policy	task's scheduling policy
 *  @sched_flags	for customizing the scheduler behaviour
 *  @sched_nice		task's nice value      (SCHED_NORMAL/BATCH)
 *  @sched_priority	task's static priority (SCHED_FIFO/RR)
 *  @sched_deadline	representative of the task's deadline
 *  @sched_runtime	representative of the task's runtime
 *  @sched_period	representative of the task's period
 *
 * Given this task model, there are a multiplicity of scheduling algorithms
 * and policies, that can be used to ensure all the tasks will make their
 * timing constraints.
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 *
 * As of now, the SCHED_DEADLINE policy (sched_dl scheduling class) is the
 * only user of this new interface. More information about the algorithm
 * available in the scheduling class file or in Documentation/.
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 */
struct sched_attr {
	u32 size;

	u32 sched_policy;
	u64 sched_flags;

	/* SCHED_NORMAL, SCHED_BATCH */
	s32 sched_nice;

	/* SCHED_FIFO, SCHED_RR */
	u32 sched_priority;

	/* SCHED_DEADLINE */
	u64 sched_runtime;
	u64 sched_deadline;
	u64 sched_period;
};

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struct futex_pi_state;
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struct robust_list_head;
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struct bio_list;
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struct fs_struct;
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struct perf_event_context;
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struct blk_plug;
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struct filename;
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struct nameidata;
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#define VMACACHE_BITS 2
#define VMACACHE_SIZE (1U << VMACACHE_BITS)
#define VMACACHE_MASK (VMACACHE_SIZE - 1)

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/*
 * These are the constant used to fake the fixed-point load-average
 * counting. Some notes:
 *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
 *    a load-average precision of 10 bits integer + 11 bits fractional
 *  - if you want to count load-averages more often, you need more
 *    precision, or rounding will get you. With 2-second counting freq,
 *    the EXP_n values would be 1981, 2034 and 2043 if still using only
 *    11 bit fractions.
 */
extern unsigned long avenrun[];		/* Load averages */
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extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
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#define FSHIFT		11		/* nr of bits of precision */
#define FIXED_1		(1<<FSHIFT)	/* 1.0 as fixed-point */
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#define LOAD_FREQ	(5*HZ+1)	/* 5 sec intervals */
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#define EXP_1		1884		/* 1/exp(5sec/1min) as fixed-point */
#define EXP_5		2014		/* 1/exp(5sec/5min) */
#define EXP_15		2037		/* 1/exp(5sec/15min) */

#define CALC_LOAD(load,exp,n) \
	load *= exp; \
	load += n*(FIXED_1-exp); \
	load >>= FSHIFT;

extern unsigned long total_forks;
extern int nr_threads;
DECLARE_PER_CPU(unsigned long, process_counts);
extern int nr_processes(void);
extern unsigned long nr_running(void);
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extern bool single_task_running(void);
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extern unsigned long nr_iowait(void);
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extern unsigned long nr_iowait_cpu(int cpu);
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extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load);
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extern void calc_global_load(unsigned long ticks);
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#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
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extern void cpu_load_update_nohz_start(void);
extern void cpu_load_update_nohz_stop(void);
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#else
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static inline void cpu_load_update_nohz_start(void) { }
static inline void cpu_load_update_nohz_stop(void) { }
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#endif
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extern void dump_cpu_task(int cpu);

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struct seq_file;
struct cfs_rq;
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struct task_group;
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#ifdef CONFIG_SCHED_DEBUG
extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m);
extern void proc_sched_set_task(struct task_struct *p);
#endif
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/*
 * Task state bitmask. NOTE! These bits are also
 * encoded in fs/proc/array.c: get_task_state().
 *
 * We have two separate sets of flags: task->state
 * is about runnability, while task->exit_state are
 * about the task exiting. Confusing, but this way
 * modifying one set can't modify the other one by
 * mistake.
 */
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#define TASK_RUNNING		0
#define TASK_INTERRUPTIBLE	1
#define TASK_UNINTERRUPTIBLE	2
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#define __TASK_STOPPED		4
#define __TASK_TRACED		8
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/* in tsk->exit_state */
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#define EXIT_DEAD		16
#define EXIT_ZOMBIE		32
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#define EXIT_TRACE		(EXIT_ZOMBIE | EXIT_DEAD)
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/* in tsk->state again */
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#define TASK_DEAD		64
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#define TASK_WAKEKILL		128
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#define TASK_WAKING		256
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#define TASK_PARKED		512
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#define TASK_NOLOAD		1024
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#define TASK_NEW		2048
#define TASK_STATE_MAX		4096
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#define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPNn"
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extern char ___assert_task_state[1 - 2*!!(
		sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)];
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/* Convenience macros for the sake of set_task_state */
#define TASK_KILLABLE		(TASK_WAKEKILL | TASK_UNINTERRUPTIBLE)
#define TASK_STOPPED		(TASK_WAKEKILL | __TASK_STOPPED)
#define TASK_TRACED		(TASK_WAKEKILL | __TASK_TRACED)
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#define TASK_IDLE		(TASK_UNINTERRUPTIBLE | TASK_NOLOAD)

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/* Convenience macros for the sake of wake_up */
#define TASK_NORMAL		(TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
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#define TASK_ALL		(TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED)
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/* get_task_state() */
#define TASK_REPORT		(TASK_RUNNING | TASK_INTERRUPTIBLE | \
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				 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
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				 __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD)
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#define task_is_traced(task)	((task->state & __TASK_TRACED) != 0)
#define task_is_stopped(task)	((task->state & __TASK_STOPPED) != 0)
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#define task_is_stopped_or_traced(task)	\
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			((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0)
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#define task_contributes_to_load(task)	\
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				((task->state & TASK_UNINTERRUPTIBLE) != 0 && \
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				 (task->flags & PF_FROZEN) == 0 && \
				 (task->state & TASK_NOLOAD) == 0)
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#ifdef CONFIG_DEBUG_ATOMIC_SLEEP

#define __set_task_state(tsk, state_value)			\
	do {							\
		(tsk)->task_state_change = _THIS_IP_;		\
		(tsk)->state = (state_value);			\
	} while (0)
#define set_task_state(tsk, state_value)			\
	do {							\
		(tsk)->task_state_change = _THIS_IP_;		\
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		smp_store_mb((tsk)->state, (state_value));		\
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	} while (0)

/*
 * set_current_state() includes a barrier so that the write of current->state
 * is correctly serialised wrt the caller's subsequent test of whether to
 * actually sleep:
 *
 *	set_current_state(TASK_UNINTERRUPTIBLE);
 *	if (do_i_need_to_sleep())
 *		schedule();
 *
 * If the caller does not need such serialisation then use __set_current_state()
 */
#define __set_current_state(state_value)			\
	do {							\
		current->task_state_change = _THIS_IP_;		\
		current->state = (state_value);			\
	} while (0)
#define set_current_state(state_value)				\
	do {							\
		current->task_state_change = _THIS_IP_;		\
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		smp_store_mb(current->state, (state_value));		\
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	} while (0)

#else

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#define __set_task_state(tsk, state_value)		\
	do { (tsk)->state = (state_value); } while (0)
#define set_task_state(tsk, state_value)		\
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	smp_store_mb((tsk)->state, (state_value))
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/*
 * set_current_state() includes a barrier so that the write of current->state
 * is correctly serialised wrt the caller's subsequent test of whether to
 * actually sleep:
 *
 *	set_current_state(TASK_UNINTERRUPTIBLE);
 *	if (do_i_need_to_sleep())
 *		schedule();
 *
 * If the caller does not need such serialisation then use __set_current_state()
 */
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#define __set_current_state(state_value)		\
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	do { current->state = (state_value); } while (0)
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#define set_current_state(state_value)			\
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	smp_store_mb(current->state, (state_value))
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#endif

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/* Task command name length */
#define TASK_COMM_LEN 16

#include <linux/spinlock.h>

/*
 * This serializes "schedule()" and also protects
 * the run-queue from deletions/modifications (but
 * _adding_ to the beginning of the run-queue has
 * a separate lock).
 */
extern rwlock_t tasklist_lock;
extern spinlock_t mmlist_lock;

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struct task_struct;
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#ifdef CONFIG_PROVE_RCU
extern int lockdep_tasklist_lock_is_held(void);
#endif /* #ifdef CONFIG_PROVE_RCU */

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extern void sched_init(void);
extern void sched_init_smp(void);
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extern asmlinkage void schedule_tail(struct task_struct *prev);
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extern void init_idle(struct task_struct *idle, int cpu);
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extern void init_idle_bootup_task(struct task_struct *idle);
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extern cpumask_var_t cpu_isolated_map;

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extern int runqueue_is_locked(int cpu);
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#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
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extern void nohz_balance_enter_idle(int cpu);
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extern void set_cpu_sd_state_idle(void);
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extern int get_nohz_timer_target(void);
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#else
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static inline void nohz_balance_enter_idle(int cpu) { }
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static inline void set_cpu_sd_state_idle(void) { }
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#endif
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/*
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 * Only dump TASK_* tasks. (0 for all tasks)
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 */
extern void show_state_filter(unsigned long state_filter);

static inline void show_state(void)
{
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	show_state_filter(0);
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}

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extern void show_regs(struct pt_regs *);

/*
 * TASK is a pointer to the task whose backtrace we want to see (or NULL for current
 * task), SP is the stack pointer of the first frame that should be shown in the back
 * trace (or NULL if the entire call-chain of the task should be shown).
 */
extern void show_stack(struct task_struct *task, unsigned long *sp);

extern void cpu_init (void);
extern void trap_init(void);
extern void update_process_times(int user);
extern void scheduler_tick(void);
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extern int sched_cpu_starting(unsigned int cpu);
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extern int sched_cpu_activate(unsigned int cpu);
extern int sched_cpu_deactivate(unsigned int cpu);
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#ifdef CONFIG_HOTPLUG_CPU
extern int sched_cpu_dying(unsigned int cpu);
#else
# define sched_cpu_dying	NULL
#endif
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extern void sched_show_task(struct task_struct *p);

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#ifdef CONFIG_LOCKUP_DETECTOR
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extern void touch_softlockup_watchdog_sched(void);
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extern void touch_softlockup_watchdog(void);
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extern void touch_softlockup_watchdog_sync(void);
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extern void touch_all_softlockup_watchdogs(void);
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extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
				  void __user *buffer,
				  size_t *lenp, loff_t *ppos);
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extern unsigned int  softlockup_panic;
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extern unsigned int  hardlockup_panic;
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void lockup_detector_init(void);
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#else
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static inline void touch_softlockup_watchdog_sched(void)
{
}
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static inline void touch_softlockup_watchdog(void)
{
}
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static inline void touch_softlockup_watchdog_sync(void)
{
}
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static inline void touch_all_softlockup_watchdogs(void)
{
}
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static inline void lockup_detector_init(void)
{
}
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#endif

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#ifdef CONFIG_DETECT_HUNG_TASK
void reset_hung_task_detector(void);
#else
static inline void reset_hung_task_detector(void)
{
}
#endif

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/* Attach to any functions which should be ignored in wchan output. */
#define __sched		__attribute__((__section__(".sched.text")))
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/* Linker adds these: start and end of __sched functions */
extern char __sched_text_start[], __sched_text_end[];

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/* Is this address in the __sched functions? */
extern int in_sched_functions(unsigned long addr);

#define	MAX_SCHEDULE_TIMEOUT	LONG_MAX
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extern signed long schedule_timeout(signed long timeout);
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extern signed long schedule_timeout_interruptible(signed long timeout);
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extern signed long schedule_timeout_killable(signed long timeout);
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extern signed long schedule_timeout_uninterruptible(signed long timeout);
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extern signed long schedule_timeout_idle(signed long timeout);
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asmlinkage void schedule(void);
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extern void schedule_preempt_disabled(void);
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extern long io_schedule_timeout(long timeout);

static inline void io_schedule(void)
{
	io_schedule_timeout(MAX_SCHEDULE_TIMEOUT);
}

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struct nsproxy;
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struct user_namespace;
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#ifdef CONFIG_MMU
extern void arch_pick_mmap_layout(struct mm_struct *mm);
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extern unsigned long
arch_get_unmapped_area(struct file *, unsigned long, unsigned long,
		       unsigned long, unsigned long);
extern unsigned long
arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
			  unsigned long len, unsigned long pgoff,
			  unsigned long flags);
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#else
static inline void arch_pick_mmap_layout(struct mm_struct *mm) {}
#endif
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#define SUID_DUMP_DISABLE	0	/* No setuid dumping */
#define SUID_DUMP_USER		1	/* Dump as user of process */
#define SUID_DUMP_ROOT		2	/* Dump as root */

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/* mm flags */
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/* for SUID_DUMP_* above */
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#define MMF_DUMPABLE_BITS 2
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#define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1)
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extern void set_dumpable(struct mm_struct *mm, int value);
/*
 * This returns the actual value of the suid_dumpable flag. For things
 * that are using this for checking for privilege transitions, it must
 * test against SUID_DUMP_USER rather than treating it as a boolean
 * value.
 */
static inline int __get_dumpable(unsigned long mm_flags)
{
	return mm_flags & MMF_DUMPABLE_MASK;
}

static inline int get_dumpable(struct mm_struct *mm)
{
	return __get_dumpable(mm->flags);
}

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/* coredump filter bits */
#define MMF_DUMP_ANON_PRIVATE	2
#define MMF_DUMP_ANON_SHARED	3
#define MMF_DUMP_MAPPED_PRIVATE	4
#define MMF_DUMP_MAPPED_SHARED	5
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#define MMF_DUMP_ELF_HEADERS	6
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#define MMF_DUMP_HUGETLB_PRIVATE 7
#define MMF_DUMP_HUGETLB_SHARED  8
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#define MMF_DUMP_DAX_PRIVATE	9
#define MMF_DUMP_DAX_SHARED	10
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#define MMF_DUMP_FILTER_SHIFT	MMF_DUMPABLE_BITS
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#define MMF_DUMP_FILTER_BITS	9
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#define MMF_DUMP_FILTER_MASK \
	(((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
#define MMF_DUMP_FILTER_DEFAULT \
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	((1 << MMF_DUMP_ANON_PRIVATE) |	(1 << MMF_DUMP_ANON_SHARED) |\
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	 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)

#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS
# define MMF_DUMP_MASK_DEFAULT_ELF	(1 << MMF_DUMP_ELF_HEADERS)
#else
# define MMF_DUMP_MASK_DEFAULT_ELF	0
#endif
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					/* leave room for more dump flags */
#define MMF_VM_MERGEABLE	16	/* KSM may merge identical pages */
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#define MMF_VM_HUGEPAGE		17	/* set when VM_HUGEPAGE is set on vma */
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#define MMF_EXE_FILE_CHANGED	18	/* see prctl_set_mm_exe_file() */
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#define MMF_HAS_UPROBES		19	/* has uprobes */
#define MMF_RECALC_UPROBES	20	/* MMF_HAS_UPROBES can be wrong */
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#define MMF_OOM_REAPED		21	/* mm has been already reaped */
526
#define MMF_OOM_NOT_REAPABLE	22	/* mm couldn't be reaped */
527

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#define MMF_INIT_MASK		(MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK)
529

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struct sighand_struct {
	atomic_t		count;
	struct k_sigaction	action[_NSIG];
	spinlock_t		siglock;
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	wait_queue_head_t	signalfd_wqh;
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};

537
struct pacct_struct {
538 539
	int			ac_flag;
	long			ac_exitcode;
540
	unsigned long		ac_mem;
541 542
	cputime_t		ac_utime, ac_stime;
	unsigned long		ac_minflt, ac_majflt;
543 544
};

545 546 547
struct cpu_itimer {
	cputime_t expires;
	cputime_t incr;
548 549
	u32 error;
	u32 incr_error;
550 551
};

552
/**
553
 * struct prev_cputime - snaphsot of system and user cputime
554 555
 * @utime: time spent in user mode
 * @stime: time spent in system mode
556
 * @lock: protects the above two fields
557
 *
558 559
 * Stores previous user/system time values such that we can guarantee
 * monotonicity.
560
 */
561 562
struct prev_cputime {
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
563 564
	cputime_t utime;
	cputime_t stime;
565 566
	raw_spinlock_t lock;
#endif
567 568
};

569 570 571 572 573 574 575 576
static inline void prev_cputime_init(struct prev_cputime *prev)
{
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
	prev->utime = prev->stime = 0;
	raw_spin_lock_init(&prev->lock);
#endif
}

577 578 579 580 581
/**
 * struct task_cputime - collected CPU time counts
 * @utime:		time spent in user mode, in &cputime_t units
 * @stime:		time spent in kernel mode, in &cputime_t units
 * @sum_exec_runtime:	total time spent on the CPU, in nanoseconds
582
 *
583 584 585
 * This structure groups together three kinds of CPU time that are tracked for
 * threads and thread groups.  Most things considering CPU time want to group
 * these counts together and treat all three of them in parallel.
586 587 588 589 590 591
 */
struct task_cputime {
	cputime_t utime;
	cputime_t stime;
	unsigned long long sum_exec_runtime;
};
592

593 594
/* Alternate field names when used to cache expirations. */
#define virt_exp	utime
595
#define prof_exp	stime
596 597
#define sched_exp	sum_exec_runtime

598 599
#define INIT_CPUTIME	\
	(struct task_cputime) {					\
600 601
		.utime = 0,					\
		.stime = 0,					\
602 603 604
		.sum_exec_runtime = 0,				\
	}

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/*
 * This is the atomic variant of task_cputime, which can be used for
 * storing and updating task_cputime statistics without locking.
 */
struct task_cputime_atomic {
	atomic64_t utime;
	atomic64_t stime;
	atomic64_t sum_exec_runtime;
};

#define INIT_CPUTIME_ATOMIC \
	(struct task_cputime_atomic) {				\
		.utime = ATOMIC64_INIT(0),			\
		.stime = ATOMIC64_INIT(0),			\
		.sum_exec_runtime = ATOMIC64_INIT(0),		\
	}

622
#define PREEMPT_DISABLED	(PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
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/*
625 626
 * Disable preemption until the scheduler is running -- use an unconditional
 * value so that it also works on !PREEMPT_COUNT kernels.
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 *
628
 * Reset by start_kernel()->sched_init()->init_idle()->init_idle_preempt_count().
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 */
630
#define INIT_PREEMPT_COUNT	PREEMPT_OFFSET
631

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/*
633 634
 * Initial preempt_count value; reflects the preempt_count schedule invariant
 * which states that during context switches:
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 *
636 637 638 639
 *    preempt_count() == 2*PREEMPT_DISABLE_OFFSET
 *
 * Note: PREEMPT_DISABLE_OFFSET is 0 for !PREEMPT_COUNT kernels.
 * Note: See finish_task_switch().
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 */
641
#define FORK_PREEMPT_COUNT	(2*PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED)
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643
/**
644
 * struct thread_group_cputimer - thread group interval timer counts
645
 * @cputime_atomic:	atomic thread group interval timers.
646 647
 * @running:		true when there are timers running and
 *			@cputime_atomic receives updates.
648 649
 * @checking_timer:	true when a thread in the group is in the
 *			process of checking for thread group timers.
650 651
 *
 * This structure contains the version of task_cputime, above, that is
652
 * used for thread group CPU timer calculations.
653
 */
654
struct thread_group_cputimer {
655
	struct task_cputime_atomic cputime_atomic;
656
	bool running;
657
	bool checking_timer;
658 659
};

660
#include <linux/rwsem.h>
661 662
struct autogroup;

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/*
664
 * NOTE! "signal_struct" does not have its own
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 * locking, because a shared signal_struct always
 * implies a shared sighand_struct, so locking
 * sighand_struct is always a proper superset of
 * the locking of signal_struct.
 */
struct signal_struct {
671
	atomic_t		sigcnt;
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	atomic_t		live;
673
	int			nr_threads;
674
	atomic_t oom_victims; /* # of TIF_MEDIE threads in this thread group */
675
	struct list_head	thread_head;
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	wait_queue_head_t	wait_chldexit;	/* for wait4() */

	/* current thread group signal load-balancing target: */
680
	struct task_struct	*curr_target;
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	/* shared signal handling: */
	struct sigpending	shared_pending;

	/* thread group exit support */
	int			group_exit_code;
	/* overloaded:
	 * - notify group_exit_task when ->count is equal to notify_count
	 * - everyone except group_exit_task is stopped during signal delivery
	 *   of fatal signals, group_exit_task processes the signal.
	 */
	int			notify_count;
693
	struct task_struct	*group_exit_task;
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	/* thread group stop support, overloads group_exit_code too */
	int			group_stop_count;
	unsigned int		flags; /* see SIGNAL_* flags below */

699 700 701 702 703 704 705 706 707 708 709 710
	/*
	 * PR_SET_CHILD_SUBREAPER marks a process, like a service
	 * manager, to re-parent orphan (double-forking) child processes
	 * to this process instead of 'init'. The service manager is
	 * able to receive SIGCHLD signals and is able to investigate
	 * the process until it calls wait(). All children of this
	 * process will inherit a flag if they should look for a
	 * child_subreaper process at exit.
	 */
	unsigned int		is_child_subreaper:1;
	unsigned int		has_child_subreaper:1;

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	/* POSIX.1b Interval Timers */
712 713
	int			posix_timer_id;
	struct list_head	posix_timers;
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	/* ITIMER_REAL timer for the process */
716
	struct hrtimer real_timer;
717
	struct pid *leader_pid;
718
	ktime_t it_real_incr;
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720 721 722 723 724 725
	/*
	 * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use
	 * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these
	 * values are defined to 0 and 1 respectively
	 */
	struct cpu_itimer it[2];
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727
	/*
728 729
	 * Thread group totals for process CPU timers.
	 * See thread_group_cputimer(), et al, for details.
730
	 */
731
	struct thread_group_cputimer cputimer;
732 733 734 735

	/* Earliest-expiration cache. */
	struct task_cputime cputime_expires;

736
#ifdef CONFIG_NO_HZ_FULL
737
	atomic_t tick_dep_mask;
738 739
#endif

740 741
	struct list_head cpu_timers[3];

742
	struct pid *tty_old_pgrp;
743

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	/* boolean value for session group leader */
	int leader;

	struct tty_struct *tty; /* NULL if no tty */

749 750 751
#ifdef CONFIG_SCHED_AUTOGROUP
	struct autogroup *autogroup;
#endif
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	/*
	 * Cumulative resource counters for dead threads in the group,
	 * and for reaped dead child processes forked by this group.
	 * Live threads maintain their own counters and add to these
	 * in __exit_signal, except for the group leader.
	 */
758
	seqlock_t stats_lock;
759
	cputime_t utime, stime, cutime, cstime;
760 761
	cputime_t gtime;
	cputime_t cgtime;
762
	struct prev_cputime prev_cputime;
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	unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
	unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
765
	unsigned long inblock, oublock, cinblock, coublock;
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	unsigned long maxrss, cmaxrss;
767
	struct task_io_accounting ioac;
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769 770 771 772 773 774 775 776
	/*
	 * Cumulative ns of schedule CPU time fo dead threads in the
	 * group, not including a zombie group leader, (This only differs
	 * from jiffies_to_ns(utime + stime) if sched_clock uses something
	 * other than jiffies.)
	 */
	unsigned long long sum_sched_runtime;

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	/*
	 * We don't bother to synchronize most readers of this at all,
	 * because there is no reader checking a limit that actually needs
	 * to get both rlim_cur and rlim_max atomically, and either one
	 * alone is a single word that can safely be read normally.
	 * getrlimit/setrlimit use task_lock(current->group_leader) to
	 * protect this instead of the siglock, because they really
	 * have no need to disable irqs.
	 */
	struct rlimit rlim[RLIM_NLIMITS];

788 789 790
#ifdef CONFIG_BSD_PROCESS_ACCT
	struct pacct_struct pacct;	/* per-process accounting information */
#endif
791 792 793
#ifdef CONFIG_TASKSTATS
	struct taskstats *stats;
#endif
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#ifdef CONFIG_AUDIT
	unsigned audit_tty;
	struct tty_audit_buf *tty_audit_buf;
#endif
798

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	/*
	 * Thread is the potential origin of an oom condition; kill first on
	 * oom
	 */
	bool oom_flag_origin;
804 805 806
	short oom_score_adj;		/* OOM kill score adjustment */
	short oom_score_adj_min;	/* OOM kill score adjustment min value.
					 * Only settable by CAP_SYS_RESOURCE. */
807 808 809 810

	struct mutex cred_guard_mutex;	/* guard against foreign influences on
					 * credential calculations
					 * (notably. ptrace) */
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811 812 813 814 815 816
};

/*
 * Bits in flags field of signal_struct.
 */
#define SIGNAL_STOP_STOPPED	0x00000001 /* job control stop in effect */
817 818
#define SIGNAL_STOP_CONTINUED	0x00000002 /* SIGCONT since WCONTINUED reap */
#define SIGNAL_GROUP_EXIT	0x00000004 /* group exit in progress */
819
#define SIGNAL_GROUP_COREDUMP	0x00000008 /* coredump in progress */
820 821 822 823 824 825
/*
 * Pending notifications to parent.
 */
#define SIGNAL_CLD_STOPPED	0x00000010
#define SIGNAL_CLD_CONTINUED	0x00000020
#define SIGNAL_CLD_MASK		(SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
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827 828
#define SIGNAL_UNKILLABLE	0x00000040 /* for init: ignore fatal signals */

829 830 831 832 833 834 835
/* If true, all threads except ->group_exit_task have pending SIGKILL */
static inline int signal_group_exit(const struct signal_struct *sig)
{
	return	(sig->flags & SIGNAL_GROUP_EXIT) ||
		(sig->group_exit_task != NULL);
}

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/*
 * Some day this will be a full-fledged user tracking system..
 */
struct user_struct {
	atomic_t __count;	/* reference count */
	atomic_t processes;	/* How many processes does this user have? */
	atomic_t sigpending;	/* How many pending signals does this user have? */
843
#ifdef CONFIG_INOTIFY_USER
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844 845 846
	atomic_t inotify_watches; /* How many inotify watches does this user have? */
	atomic_t inotify_devs;	/* How many inotify devs does this user have opened? */
#endif
847 848 849
#ifdef CONFIG_FANOTIFY
	atomic_t fanotify_listeners;
#endif
850
#ifdef CONFIG_EPOLL
851
	atomic_long_t epoll_watches; /* The number of file descriptors currently watched */
852
#endif
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#ifdef CONFIG_POSIX_MQUEUE
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	/* protected by mq_lock	*/
	unsigned long mq_bytes;	/* How many bytes can be allocated to mqueue? */
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856
#endif
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	unsigned long locked_shm; /* How many pages of mlocked shm ? */
858
	unsigned long unix_inflight;	/* How many files in flight in unix sockets */
859
	atomic_long_t pipe_bufs;  /* how many pages are allocated in pipe buffers */
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#ifdef CONFIG_KEYS
	struct key *uid_keyring;	/* UID specific keyring */
	struct key *session_keyring;	/* UID's default session keyring */
#endif

	/* Hash table maintenance information */
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	struct hlist_node uidhash_node;
868
	kuid_t uid;
869

870
#if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL)
871 872
	atomic_long_t locked_vm;
#endif
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873 874
};

875
extern int uids_sysfs_init(void);
876

877
extern struct user_struct *find_user(kuid_t);
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878 879 880 881

extern struct user_struct root_user;
#define INIT_USER (&root_user)

882

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struct backing_dev_info;
struct reclaim_state;

886
#ifdef CONFIG_SCHED_INFO
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887 888
struct sched_info {
	/* cumulative counters */
889
	unsigned long pcount;	      /* # of times run on this cpu */
890
	unsigned long long run_delay; /* time spent waiting on a runqueue */
L
Linus Torvalds 已提交
891 892

	/* timestamps */
893 894
	unsigned long long last_arrival,/* when we last ran on a cpu */
			   last_queued;	/* when we were last queued to run */
L
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895
};
896
#endif /* CONFIG_SCHED_INFO */
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898 899 900 901 902 903 904 905 906 907 908 909 910 911
#ifdef CONFIG_TASK_DELAY_ACCT
struct task_delay_info {
	spinlock_t	lock;
	unsigned int	flags;	/* Private per-task flags */

	/* For each stat XXX, add following, aligned appropriately
	 *
	 * struct timespec XXX_start, XXX_end;
	 * u64 XXX_delay;
	 * u32 XXX_count;
	 *
	 * Atomicity of updates to XXX_delay, XXX_count protected by
	 * single lock above (split into XXX_lock if contention is an issue).
	 */
912 913 914 915 916 917

	/*
	 * XXX_count is incremented on every XXX operation, the delay
	 * associated with the operation is added to XXX_delay.
	 * XXX_delay contains the accumulated delay time in nanoseconds.
	 */
918
	u64 blkio_start;	/* Shared by blkio, swapin */
919 920 921 922 923 924
	u64 blkio_delay;	/* wait for sync block io completion */
	u64 swapin_delay;	/* wait for swapin block io completion */
	u32 blkio_count;	/* total count of the number of sync block */
				/* io operations performed */
	u32 swapin_count;	/* total count of the number of swapin block */
				/* io operations performed */
925

926
	u64 freepages_start;
927 928
	u64 freepages_delay;	/* wait for memory reclaim */
	u32 freepages_count;	/* total count of memory reclaim */
929
};
930 931 932 933 934 935 936 937 938 939 940
#endif	/* CONFIG_TASK_DELAY_ACCT */

static inline int sched_info_on(void)
{
#ifdef CONFIG_SCHEDSTATS
	return 1;
#elif defined(CONFIG_TASK_DELAY_ACCT)
	extern int delayacct_on;
	return delayacct_on;
#else
	return 0;
941
#endif
942
}
943

944 945 946 947
#ifdef CONFIG_SCHEDSTATS
void force_schedstat_enabled(void);
#endif

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948 949 950 951 952
enum cpu_idle_type {
	CPU_IDLE,
	CPU_NOT_IDLE,
	CPU_NEWLY_IDLE,
	CPU_MAX_IDLE_TYPES
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953 954
};

955 956 957 958 959 960 961 962 963 964
/*
 * Integer metrics need fixed point arithmetic, e.g., sched/fair
 * has a few: load, load_avg, util_avg, freq, and capacity.
 *
 * We define a basic fixed point arithmetic range, and then formalize
 * all these metrics based on that basic range.
 */
# define SCHED_FIXEDPOINT_SHIFT	10
# define SCHED_FIXEDPOINT_SCALE	(1L << SCHED_FIXEDPOINT_SHIFT)

965
/*
966
 * Increase resolution of cpu_capacity calculations
967
 */
968
#define SCHED_CAPACITY_SHIFT	SCHED_FIXEDPOINT_SHIFT
969
#define SCHED_CAPACITY_SCALE	(1L << SCHED_CAPACITY_SHIFT)
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971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
/*
 * Wake-queues are lists of tasks with a pending wakeup, whose
 * callers have already marked the task as woken internally,
 * and can thus carry on. A common use case is being able to
 * do the wakeups once the corresponding user lock as been
 * released.
 *
 * We hold reference to each task in the list across the wakeup,
 * thus guaranteeing that the memory is still valid by the time
 * the actual wakeups are performed in wake_up_q().
 *
 * One per task suffices, because there's never a need for a task to be
 * in two wake queues simultaneously; it is forbidden to abandon a task
 * in a wake queue (a call to wake_up_q() _must_ follow), so if a task is
 * already in a wake queue, the wakeup will happen soon and the second
 * waker can just skip it.
 *
 * The WAKE_Q macro declares and initializes the list head.
 * wake_up_q() does NOT reinitialize the list; it's expected to be
 * called near the end of a function, where the fact that the queue is
 * not used again will be easy to see by inspection.
 *
 * Note that this can cause spurious wakeups. schedule() callers
 * must ensure the call is done inside a loop, confirming that the
 * wakeup condition has in fact occurred.
 */
struct wake_q_node {
	struct wake_q_node *next;
};

struct wake_q_head {
	struct wake_q_node *first;
	struct wake_q_node **lastp;
};

#define WAKE_Q_TAIL ((struct wake_q_node *) 0x01)

#define WAKE_Q(name)					\
	struct wake_q_head name = { WAKE_Q_TAIL, &name.first }

extern void wake_q_add(struct wake_q_head *head,
		       struct task_struct *task);
extern void wake_up_q(struct wake_q_head *head);

1015 1016 1017
/*
 * sched-domains (multiprocessor balancing) declarations:
 */
1018
#ifdef CONFIG_SMP
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Peter Zijlstra 已提交
1019 1020 1021 1022
#define SD_LOAD_BALANCE		0x0001	/* Do load balancing on this domain. */
#define SD_BALANCE_NEWIDLE	0x0002	/* Balance when about to become idle */
#define SD_BALANCE_EXEC		0x0004	/* Balance on exec */
#define SD_BALANCE_FORK		0x0008	/* Balance on fork, clone */
1023
#define SD_BALANCE_WAKE		0x0010  /* Balance on wakeup */
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#define SD_WAKE_AFFINE		0x0020	/* Wake task to waking CPU */
1025
#define SD_SHARE_CPUCAPACITY	0x0080	/* Domain members share cpu power */
1026
#define SD_SHARE_POWERDOMAIN	0x0100	/* Domain members share power domain */
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#define SD_SHARE_PKG_RESOURCES	0x0200	/* Domain members share cpu pkg resources */
#define SD_SERIALIZE		0x0400	/* Only a single load balancing instance */
1029
#define SD_ASYM_PACKING		0x0800  /* Place busy groups earlier in the domain */
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Peter Zijlstra 已提交
1030
#define SD_PREFER_SIBLING	0x1000	/* Prefer to place tasks in a sibling domain */
1031
#define SD_OVERLAP		0x2000	/* sched_domains of this level overlap */
1032
#define SD_NUMA			0x4000	/* cross-node balancing */
1033

1034
#ifdef CONFIG_SCHED_SMT
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Guenter Roeck 已提交
1035
static inline int cpu_smt_flags(void)
1036
{
1037
	return SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES;
1038 1039 1040 1041
}
#endif

#ifdef CONFIG_SCHED_MC
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static inline int cpu_core_flags(void)
1043 1044 1045 1046 1047 1048
{
	return SD_SHARE_PKG_RESOURCES;
}
#endif

#ifdef CONFIG_NUMA
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static inline int cpu_numa_flags(void)
1050 1051 1052 1053
{
	return SD_NUMA;
}
#endif
1054

1055 1056 1057 1058 1059 1060 1061 1062
struct sched_domain_attr {
	int relax_domain_level;
};

#define SD_ATTR_INIT	(struct sched_domain_attr) {	\
	.relax_domain_level = -1,			\
}

1063 1064
extern int sched_domain_level_max;

1065 1066
struct sched_group;

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struct sched_domain {
	/* These fields must be setup */
	struct sched_domain *parent;	/* top domain must be null terminated */
1070
	struct sched_domain *child;	/* bottom domain must be null terminated */
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	struct sched_group *groups;	/* the balancing groups of the domain */
	unsigned long min_interval;	/* Minimum balance interval ms */
	unsigned long max_interval;	/* Maximum balance interval ms */
	unsigned int busy_factor;	/* less balancing by factor if busy */
	unsigned int imbalance_pct;	/* No balance until over watermark */
	unsigned int cache_nice_tries;	/* Leave cache hot tasks for # tries */
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	unsigned int busy_idx;
	unsigned int idle_idx;
	unsigned int newidle_idx;
	unsigned int wake_idx;
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	unsigned int forkexec_idx;
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	unsigned int smt_gain;
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	int nohz_idle;			/* NOHZ IDLE status */
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	int flags;			/* See SD_* */
1086
	int level;
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1087 1088 1089 1090 1091 1092

	/* Runtime fields. */
	unsigned long last_balance;	/* init to jiffies. units in jiffies */
	unsigned int balance_interval;	/* initialise to 1. units in ms. */
	unsigned int nr_balance_failed; /* initialise to 0 */

1093
	/* idle_balance() stats */
1094
	u64 max_newidle_lb_cost;
1095
	unsigned long next_decay_max_lb_cost;
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#ifdef CONFIG_SCHEDSTATS
	/* load_balance() stats */
1099 1100 1101 1102 1103 1104 1105 1106
	unsigned int lb_count[CPU_MAX_IDLE_TYPES];
	unsigned int lb_failed[CPU_MAX_IDLE_TYPES];
	unsigned int lb_balanced[CPU_MAX_IDLE_TYPES];
	unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES];
	unsigned int lb_gained[CPU_MAX_IDLE_TYPES];
	unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES];
	unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES];
	unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES];
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	/* Active load balancing */
1109 1110 1111
	unsigned int alb_count;
	unsigned int alb_failed;
	unsigned int alb_pushed;
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1113
	/* SD_BALANCE_EXEC stats */
1114 1115 1116
	unsigned int sbe_count;
	unsigned int sbe_balanced;
	unsigned int sbe_pushed;
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1118
	/* SD_BALANCE_FORK stats */
1119 1120 1121
	unsigned int sbf_count;
	unsigned int sbf_balanced;
	unsigned int sbf_pushed;
1122

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	/* try_to_wake_up() stats */
1124 1125 1126
	unsigned int ttwu_wake_remote;
	unsigned int ttwu_move_affine;
	unsigned int ttwu_move_balance;
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#endif
1128 1129 1130
#ifdef CONFIG_SCHED_DEBUG
	char *name;
#endif
1131 1132 1133 1134
	union {
		void *private;		/* used during construction */
		struct rcu_head rcu;	/* used during destruction */
	};
1135

1136
	unsigned int span_weight;
1137 1138 1139 1140 1141 1142 1143 1144
	/*
	 * Span of all CPUs in this domain.
	 *
	 * NOTE: this field is variable length. (Allocated dynamically
	 * by attaching extra space to the end of the structure,
	 * depending on how many CPUs the kernel has booted up with)
	 */
	unsigned long span[0];
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};

1147 1148
static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
{
1149
	return to_cpumask(sd->span);
1150 1151
}

1152
extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1153
				    struct sched_domain_attr *dattr_new);
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1155 1156 1157 1158
/* Allocate an array of sched domains, for partition_sched_domains(). */
cpumask_var_t *alloc_sched_domains(unsigned int ndoms);
void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms);

1159 1160
bool cpus_share_cache(int this_cpu, int that_cpu);

1161
typedef const struct cpumask *(*sched_domain_mask_f)(int cpu);
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typedef int (*sched_domain_flags_f)(void);
1163 1164 1165 1166 1167 1168

#define SDTL_OVERLAP	0x01

struct sd_data {
	struct sched_domain **__percpu sd;
	struct sched_group **__percpu sg;
1169
	struct sched_group_capacity **__percpu sgc;
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
};

struct sched_domain_topology_level {
	sched_domain_mask_f mask;
	sched_domain_flags_f sd_flags;
	int		    flags;
	int		    numa_level;
	struct sd_data      data;
#ifdef CONFIG_SCHED_DEBUG
	char                *name;
#endif
};

extern void set_sched_topology(struct sched_domain_topology_level *tl);
1184
extern void wake_up_if_idle(int cpu);
1185 1186 1187 1188 1189 1190 1191

#ifdef CONFIG_SCHED_DEBUG
# define SD_INIT_NAME(type)		.name = #type
#else
# define SD_INIT_NAME(type)
#endif

1192
#else /* CONFIG_SMP */
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1194
struct sched_domain_attr;
1195

1196
static inline void
1197
partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[],
1198 1199
			struct sched_domain_attr *dattr_new)
{
1200
}
1201 1202 1203 1204 1205 1206

static inline bool cpus_share_cache(int this_cpu, int that_cpu)
{
	return true;
}

1207
#endif	/* !CONFIG_SMP */
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1209

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struct io_context;			/* See blkdev.h */


1213
#ifdef ARCH_HAS_PREFETCH_SWITCH_STACK
1214
extern void prefetch_stack(struct task_struct *t);
1215 1216 1217
#else
static inline void prefetch_stack(struct task_struct *t) { }
#endif
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struct audit_context;		/* See audit.c */
struct mempolicy;
1221
struct pipe_inode_info;
1222
struct uts_namespace;
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struct load_weight {
1225 1226
	unsigned long weight;
	u32 inv_weight;
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1227 1228
};

1229
/*
1230 1231 1232 1233 1234 1235 1236 1237 1238
 * The load_avg/util_avg accumulates an infinite geometric series
 * (see __update_load_avg() in kernel/sched/fair.c).
 *
 * [load_avg definition]
 *
 *   load_avg = runnable% * scale_load_down(load)
 *
 * where runnable% is the time ratio that a sched_entity is runnable.
 * For cfs_rq, it is the aggregated load_avg of all runnable and
1239
 * blocked sched_entities.
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279
 *
 * load_avg may also take frequency scaling into account:
 *
 *   load_avg = runnable% * scale_load_down(load) * freq%
 *
 * where freq% is the CPU frequency normalized to the highest frequency.
 *
 * [util_avg definition]
 *
 *   util_avg = running% * SCHED_CAPACITY_SCALE
 *
 * where running% is the time ratio that a sched_entity is running on
 * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable
 * and blocked sched_entities.
 *
 * util_avg may also factor frequency scaling and CPU capacity scaling:
 *
 *   util_avg = running% * SCHED_CAPACITY_SCALE * freq% * capacity%
 *
 * where freq% is the same as above, and capacity% is the CPU capacity
 * normalized to the greatest capacity (due to uarch differences, etc).
 *
 * N.B., the above ratios (runnable%, running%, freq%, and capacity%)
 * themselves are in the range of [0, 1]. To do fixed point arithmetics,
 * we therefore scale them to as large a range as necessary. This is for
 * example reflected by util_avg's SCHED_CAPACITY_SCALE.
 *
 * [Overflow issue]
 *
 * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities
 * with the highest load (=88761), always runnable on a single cfs_rq,
 * and should not overflow as the number already hits PID_MAX_LIMIT.
 *
 * For all other cases (including 32-bit kernels), struct load_weight's
 * weight will overflow first before we do, because:
 *
 *    Max(load_avg) <= Max(load.weight)
 *
 * Then it is the load_weight's responsibility to consider overflow
 * issues.
1280
 */
1281
struct sched_avg {
1282 1283 1284
	u64 last_update_time, load_sum;
	u32 util_sum, period_contrib;
	unsigned long load_avg, util_avg;
1285 1286
};

1287
#ifdef CONFIG_SCHEDSTATS
1288
struct sched_statistics {
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	u64			wait_start;
1290
	u64			wait_max;
1291 1292
	u64			wait_count;
	u64			wait_sum;
1293 1294
	u64			iowait_count;
	u64			iowait_sum;
1295

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	u64			sleep_start;
	u64			sleep_max;
1298 1299 1300
	s64			sum_sleep_runtime;

	u64			block_start;
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	u64			block_max;
	u64			exec_max;
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	u64			slice_max;
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319

	u64			nr_migrations_cold;
	u64			nr_failed_migrations_affine;
	u64			nr_failed_migrations_running;
	u64			nr_failed_migrations_hot;
	u64			nr_forced_migrations;

	u64			nr_wakeups;
	u64			nr_wakeups_sync;
	u64			nr_wakeups_migrate;
	u64			nr_wakeups_local;
	u64			nr_wakeups_remote;
	u64			nr_wakeups_affine;
	u64			nr_wakeups_affine_attempts;
	u64			nr_wakeups_passive;
	u64			nr_wakeups_idle;
1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337
};
#endif

struct sched_entity {
	struct load_weight	load;		/* for load-balancing */
	struct rb_node		run_node;
	struct list_head	group_node;
	unsigned int		on_rq;

	u64			exec_start;
	u64			sum_exec_runtime;
	u64			vruntime;
	u64			prev_sum_exec_runtime;

	u64			nr_migrations;

#ifdef CONFIG_SCHEDSTATS
	struct sched_statistics statistics;
1338 1339
#endif

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#ifdef CONFIG_FAIR_GROUP_SCHED
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	int			depth;
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1342 1343 1344 1345 1346 1347
	struct sched_entity	*parent;
	/* rq on which this entity is (to be) queued: */
	struct cfs_rq		*cfs_rq;
	/* rq "owned" by this entity/group: */
	struct cfs_rq		*my_q;
#endif
1348

1349
#ifdef CONFIG_SMP
1350 1351 1352 1353 1354 1355 1356
	/*
	 * Per entity load average tracking.
	 *
	 * Put into separate cache line so it does not
	 * collide with read-mostly values above.
	 */
	struct sched_avg	avg ____cacheline_aligned_in_smp;
1357
#endif
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1358
};
1359

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1360 1361
struct sched_rt_entity {
	struct list_head run_list;
1362
	unsigned long timeout;
1363
	unsigned long watchdog_stamp;
1364
	unsigned int time_slice;
1365 1366
	unsigned short on_rq;
	unsigned short on_list;
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1367

1368
	struct sched_rt_entity *back;
1369
#ifdef CONFIG_RT_GROUP_SCHED
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1370 1371 1372 1373 1374 1375
	struct sched_rt_entity	*parent;
	/* rq on which this entity is (to be) queued: */
	struct rt_rq		*rt_rq;
	/* rq "owned" by this entity/group: */
	struct rt_rq		*my_q;
#endif
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1376 1377
};

1378 1379 1380 1381 1382
struct sched_dl_entity {
	struct rb_node	rb_node;

	/*
	 * Original scheduling parameters. Copied here from sched_attr
1383 1384
	 * during sched_setattr(), they will remain the same until
	 * the next sched_setattr().
1385 1386 1387
	 */
	u64 dl_runtime;		/* maximum runtime for each instance	*/
	u64 dl_deadline;	/* relative deadline of each instance	*/
1388
	u64 dl_period;		/* separation of two instances (period) */
1389
	u64 dl_bw;		/* dl_runtime / dl_deadline		*/
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406

	/*
	 * Actual scheduling parameters. Initialized with the values above,
	 * they are continously updated during task execution. Note that
	 * the remaining runtime could be < 0 in case we are in overrun.
	 */
	s64 runtime;		/* remaining runtime for this instance	*/
	u64 deadline;		/* absolute deadline for this instance	*/
	unsigned int flags;	/* specifying the scheduler behaviour	*/

	/*
	 * Some bool flags:
	 *
	 * @dl_throttled tells if we exhausted the runtime. If so, the
	 * task has to wait for a replenishment to be performed at the
	 * next firing of dl_timer.
	 *
1407 1408
	 * @dl_boosted tells if we are boosted due to DI. If so we are
	 * outside bandwidth enforcement mechanism (but only until we
1409 1410 1411 1412
	 * exit the critical section);
	 *
	 * @dl_yielded tells if task gave up the cpu before consuming
	 * all its available runtime during the last job.
1413
	 */
1414
	int dl_throttled, dl_boosted, dl_yielded;
1415 1416 1417 1418 1419 1420 1421

	/*
	 * Bandwidth enforcement timer. Each -deadline task has its
	 * own bandwidth to be enforced, thus we need one timer per task.
	 */
	struct hrtimer dl_timer;
};
1422

1423 1424
union rcu_special {
	struct {
1425 1426 1427 1428 1429 1430
		u8 blocked;
		u8 need_qs;
		u8 exp_need_qs;
		u8 pad;	/* Otherwise the compiler can store garbage here. */
	} b; /* Bits. */
	u32 s; /* Set of bits. */
1431
};
1432 1433
struct rcu_node;

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1434 1435 1436
enum perf_event_task_context {
	perf_invalid_context = -1,
	perf_hw_context = 0,
1437
	perf_sw_context,
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1438 1439 1440
	perf_nr_task_contexts,
};

1441 1442 1443 1444 1445 1446 1447 1448 1449 1450
/* Track pages that require TLB flushes */
struct tlbflush_unmap_batch {
	/*
	 * Each bit set is a CPU that potentially has a TLB entry for one of
	 * the PFNs being flushed. See set_tlb_ubc_flush_pending().
	 */
	struct cpumask cpumask;

	/* True if any bit in cpumask is set */
	bool flush_required;
1451 1452 1453 1454 1455 1456 1457

	/*
	 * If true then the PTE was dirty when unmapped. The entry must be
	 * flushed before IO is initiated or a stale TLB entry potentially
	 * allows an update without redirtying the page.
	 */
	bool writable;
1458 1459
};

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struct task_struct {
1461 1462 1463 1464 1465 1466 1467
#ifdef CONFIG_THREAD_INFO_IN_TASK
	/*
	 * For reasons of header soup (see current_thread_info()), this
	 * must be the first element of task_struct.
	 */
	struct thread_info thread_info;
#endif
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	volatile long state;	/* -1 unrunnable, 0 runnable, >0 stopped */
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1469
	void *stack;
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1470
	atomic_t usage;
1471 1472
	unsigned int flags;	/* per process flags, defined below */
	unsigned int ptrace;
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1473

1474
#ifdef CONFIG_SMP
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1475
	struct llist_node wake_entry;
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1476
	int on_cpu;
1477 1478 1479
#ifdef CONFIG_THREAD_INFO_IN_TASK
	unsigned int cpu;	/* current CPU */
#endif
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1480
	unsigned int wakee_flips;
1481
	unsigned long wakee_flip_decay_ts;
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1482
	struct task_struct *last_wakee;
1483 1484

	int wake_cpu;
1485
#endif
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1486
	int on_rq;
1487

1488
	int prio, static_prio, normal_prio;
1489
	unsigned int rt_priority;
1490
	const struct sched_class *sched_class;
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1491
	struct sched_entity se;
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1492
	struct sched_rt_entity rt;
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1493 1494 1495
#ifdef CONFIG_CGROUP_SCHED
	struct task_group *sched_task_group;
#endif
1496
	struct sched_dl_entity dl;
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1498 1499 1500 1501 1502
#ifdef CONFIG_PREEMPT_NOTIFIERS
	/* list of struct preempt_notifier: */
	struct hlist_head preempt_notifiers;
#endif

1503
#ifdef CONFIG_BLK_DEV_IO_TRACE
1504
	unsigned int btrace_seq;
1505
#endif
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1506

1507
	unsigned int policy;
1508
	int nr_cpus_allowed;
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1509 1510
	cpumask_t cpus_allowed;

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1511
#ifdef CONFIG_PREEMPT_RCU
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1512
	int rcu_read_lock_nesting;
1513
	union rcu_special rcu_read_unlock_special;
1514
	struct list_head rcu_node_entry;
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1515
	struct rcu_node *rcu_blocked_node;
1516
#endif /* #ifdef CONFIG_PREEMPT_RCU */
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1517 1518 1519 1520
#ifdef CONFIG_TASKS_RCU
	unsigned long rcu_tasks_nvcsw;
	bool rcu_tasks_holdout;
	struct list_head rcu_tasks_holdout_list;
1521
	int rcu_tasks_idle_cpu;
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1522
#endif /* #ifdef CONFIG_TASKS_RCU */
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1523

1524
#ifdef CONFIG_SCHED_INFO
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1525 1526 1527 1528
	struct sched_info sched_info;
#endif

	struct list_head tasks;
1529
#ifdef CONFIG_SMP
1530
	struct plist_node pushable_tasks;
1531
	struct rb_node pushable_dl_tasks;
1532
#endif
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1533 1534

	struct mm_struct *mm, *active_mm;
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1535 1536 1537
	/* per-thread vma caching */
	u32 vmacache_seqnum;
	struct vm_area_struct *vmacache[VMACACHE_SIZE];
1538 1539 1540
#if defined(SPLIT_RSS_COUNTING)
	struct task_rss_stat	rss_stat;
#endif
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1541
/* task state */
1542
	int exit_state;
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1543 1544
	int exit_code, exit_signal;
	int pdeath_signal;  /*  The signal sent when the parent dies  */
1545
	unsigned long jobctl;	/* JOBCTL_*, siglock protected */
1546 1547

	/* Used for emulating ABI behavior of previous Linux versions */
1548
	unsigned int personality;
1549

1550
	/* scheduler bits, serialized by scheduler locks */
1551
	unsigned sched_reset_on_fork:1;
1552
	unsigned sched_contributes_to_load:1;
1553
	unsigned sched_migrated:1;
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1554
	unsigned sched_remote_wakeup:1;
1555 1556 1557 1558 1559
	unsigned :0; /* force alignment to the next boundary */

	/* unserialized, strictly 'current' */
	unsigned in_execve:1; /* bit to tell LSMs we're in execve */
	unsigned in_iowait:1;
1560 1561 1562
#if !defined(TIF_RESTORE_SIGMASK)
	unsigned restore_sigmask:1;
#endif
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1563 1564
#ifdef CONFIG_MEMCG
	unsigned memcg_may_oom:1;
1565
#ifndef CONFIG_SLOB
1566 1567
	unsigned memcg_kmem_skip_account:1;
#endif
1568
#endif
1569 1570 1571
#ifdef CONFIG_COMPAT_BRK
	unsigned brk_randomized:1;
#endif
1572

1573 1574
	unsigned long atomic_flags; /* Flags needing atomic access. */

1575 1576
	struct restart_block restart_block;

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1577 1578
	pid_t pid;
	pid_t tgid;
1579

1580
#ifdef CONFIG_CC_STACKPROTECTOR
1581 1582
	/* Canary value for the -fstack-protector gcc feature */
	unsigned long stack_canary;
1583
#endif
1584
	/*
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1585
	 * pointers to (original) parent process, youngest child, younger sibling,
1586
	 * older sibling, respectively.  (p->father can be replaced with
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1587
	 * p->real_parent->pid)
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1588
	 */
1589 1590
	struct task_struct __rcu *real_parent; /* real parent process */
	struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */
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1591
	/*
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1592
	 * children/sibling forms the list of my natural children
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1593 1594 1595 1596 1597
	 */
	struct list_head children;	/* list of my children */
	struct list_head sibling;	/* linkage in my parent's children list */
	struct task_struct *group_leader;	/* threadgroup leader */

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1598 1599 1600 1601 1602 1603 1604 1605
	/*
	 * ptraced is the list of tasks this task is using ptrace on.
	 * This includes both natural children and PTRACE_ATTACH targets.
	 * p->ptrace_entry is p's link on the p->parent->ptraced list.
	 */
	struct list_head ptraced;
	struct list_head ptrace_entry;

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1606
	/* PID/PID hash table linkage. */
1607
	struct pid_link pids[PIDTYPE_MAX];
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1608
	struct list_head thread_group;
1609
	struct list_head thread_node;
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1610 1611 1612 1613 1614

	struct completion *vfork_done;		/* for vfork() */
	int __user *set_child_tid;		/* CLONE_CHILD_SETTID */
	int __user *clear_child_tid;		/* CLONE_CHILD_CLEARTID */

1615
	cputime_t utime, stime, utimescaled, stimescaled;
1616
	cputime_t gtime;
1617
	struct prev_cputime prev_cputime;
1618
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
1619
	seqcount_t vtime_seqcount;
1620 1621
	unsigned long long vtime_snap;
	enum {
1622 1623 1624
		/* Task is sleeping or running in a CPU with VTIME inactive */
		VTIME_INACTIVE = 0,
		/* Task runs in userspace in a CPU with VTIME active */
1625
		VTIME_USER,
1626
		/* Task runs in kernelspace in a CPU with VTIME active */
1627 1628
		VTIME_SYS,
	} vtime_snap_whence;
1629
#endif
1630 1631

#ifdef CONFIG_NO_HZ_FULL
1632
	atomic_t tick_dep_mask;
1633
#endif
L
Linus Torvalds 已提交
1634
	unsigned long nvcsw, nivcsw; /* context switch counts */
1635
	u64 start_time;		/* monotonic time in nsec */
1636
	u64 real_start_time;	/* boot based time in nsec */
L
Linus Torvalds 已提交
1637 1638 1639
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */
	unsigned long min_flt, maj_flt;

1640
	struct task_cputime cputime_expires;
L
Linus Torvalds 已提交
1641 1642 1643
	struct list_head cpu_timers[3];

/* process credentials */
A
Arnd Bergmann 已提交
1644
	const struct cred __rcu *real_cred; /* objective and real subjective task
1645
					 * credentials (COW) */
A
Arnd Bergmann 已提交
1646
	const struct cred __rcu *cred;	/* effective (overridable) subjective task
1647
					 * credentials (COW) */
1648 1649 1650
	char comm[TASK_COMM_LEN]; /* executable name excluding path
				     - access with [gs]et_task_comm (which lock
				       it with task_lock())
1651
				     - initialized normally by setup_new_exec */
L
Linus Torvalds 已提交
1652
/* file system info */
1653
	struct nameidata *nameidata;
1654
#ifdef CONFIG_SYSVIPC
L
Linus Torvalds 已提交
1655 1656
/* ipc stuff */
	struct sysv_sem sysvsem;
1657
	struct sysv_shm sysvshm;
1658
#endif
1659
#ifdef CONFIG_DETECT_HUNG_TASK
1660 1661 1662
/* hung task detection */
	unsigned long last_switch_count;
#endif
L
Linus Torvalds 已提交
1663 1664 1665 1666
/* filesystem information */
	struct fs_struct *fs;
/* open file information */
	struct files_struct *files;
1667
/* namespaces */
S
Serge E. Hallyn 已提交
1668
	struct nsproxy *nsproxy;
L
Linus Torvalds 已提交
1669 1670 1671 1672 1673
/* signal handlers */
	struct signal_struct *signal;
	struct sighand_struct *sighand;

	sigset_t blocked, real_blocked;
1674
	sigset_t saved_sigmask;	/* restored if set_restore_sigmask() was used */
L
Linus Torvalds 已提交
1675 1676 1677 1678
	struct sigpending pending;

	unsigned long sas_ss_sp;
	size_t sas_ss_size;
1679
	unsigned sas_ss_flags;
1680

1681
	struct callback_head *task_works;
1682

L
Linus Torvalds 已提交
1683
	struct audit_context *audit_context;
A
Al Viro 已提交
1684
#ifdef CONFIG_AUDITSYSCALL
1685
	kuid_t loginuid;
1686
	unsigned int sessionid;
A
Al Viro 已提交
1687
#endif
1688
	struct seccomp seccomp;
L
Linus Torvalds 已提交
1689 1690 1691 1692

/* Thread group tracking */
   	u32 parent_exec_id;
   	u32 self_exec_id;
1693 1694
/* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed,
 * mempolicy */
L
Linus Torvalds 已提交
1695 1696
	spinlock_t alloc_lock;

1697
	/* Protection of the PI data structures: */
1698
	raw_spinlock_t pi_lock;
1699

1700 1701
	struct wake_q_node wake_q;

I
Ingo Molnar 已提交
1702 1703
#ifdef CONFIG_RT_MUTEXES
	/* PI waiters blocked on a rt_mutex held by this task */
1704 1705
	struct rb_root pi_waiters;
	struct rb_node *pi_waiters_leftmost;
I
Ingo Molnar 已提交
1706 1707 1708 1709
	/* Deadlock detection and priority inheritance handling */
	struct rt_mutex_waiter *pi_blocked_on;
#endif

1710 1711 1712 1713
#ifdef CONFIG_DEBUG_MUTEXES
	/* mutex deadlock detection */
	struct mutex_waiter *blocked_on;
#endif
1714 1715 1716 1717
#ifdef CONFIG_TRACE_IRQFLAGS
	unsigned int irq_events;
	unsigned long hardirq_enable_ip;
	unsigned long hardirq_disable_ip;
1718
	unsigned int hardirq_enable_event;
1719
	unsigned int hardirq_disable_event;
1720 1721
	int hardirqs_enabled;
	int hardirq_context;
1722 1723
	unsigned long softirq_disable_ip;
	unsigned long softirq_enable_ip;
1724
	unsigned int softirq_disable_event;
1725
	unsigned int softirq_enable_event;
1726
	int softirqs_enabled;
1727 1728
	int softirq_context;
#endif
I
Ingo Molnar 已提交
1729
#ifdef CONFIG_LOCKDEP
1730
# define MAX_LOCK_DEPTH 48UL
I
Ingo Molnar 已提交
1731 1732 1733
	u64 curr_chain_key;
	int lockdep_depth;
	unsigned int lockdep_recursion;
1734
	struct held_lock held_locks[MAX_LOCK_DEPTH];
1735
	gfp_t lockdep_reclaim_gfp;
I
Ingo Molnar 已提交
1736
#endif
1737 1738 1739
#ifdef CONFIG_UBSAN
	unsigned int in_ubsan;
#endif
1740

L
Linus Torvalds 已提交
1741 1742 1743
/* journalling filesystem info */
	void *journal_info;

1744
/* stacked block device info */
1745
	struct bio_list *bio_list;
1746

1747 1748 1749 1750 1751
#ifdef CONFIG_BLOCK
/* stack plugging */
	struct blk_plug *plug;
#endif

L
Linus Torvalds 已提交
1752 1753 1754 1755 1756 1757 1758 1759 1760
/* VM state */
	struct reclaim_state *reclaim_state;

	struct backing_dev_info *backing_dev_info;

	struct io_context *io_context;

	unsigned long ptrace_message;
	siginfo_t *last_siginfo; /* For ptrace use.  */
1761
	struct task_io_accounting ioac;
1762
#if defined(CONFIG_TASK_XACCT)
L
Linus Torvalds 已提交
1763 1764
	u64 acct_rss_mem1;	/* accumulated rss usage */
	u64 acct_vm_mem1;	/* accumulated virtual memory usage */
1765
	cputime_t acct_timexpd;	/* stime + utime since last update */
L
Linus Torvalds 已提交
1766 1767
#endif
#ifdef CONFIG_CPUSETS
1768
	nodemask_t mems_allowed;	/* Protected by alloc_lock */
1769
	seqcount_t mems_allowed_seq;	/* Seqence no to catch updates */
1770
	int cpuset_mem_spread_rotor;
1771
	int cpuset_slab_spread_rotor;
L
Linus Torvalds 已提交
1772
#endif
1773
#ifdef CONFIG_CGROUPS
1774
	/* Control Group info protected by css_set_lock */
A
Arnd Bergmann 已提交
1775
	struct css_set __rcu *cgroups;
1776 1777
	/* cg_list protected by css_set_lock and tsk->alloc_lock */
	struct list_head cg_list;
1778
#endif
1779
#ifdef CONFIG_FUTEX
1780
	struct robust_list_head __user *robust_list;
1781 1782 1783
#ifdef CONFIG_COMPAT
	struct compat_robust_list_head __user *compat_robust_list;
#endif
1784 1785
	struct list_head pi_state_list;
	struct futex_pi_state *pi_state_cache;
1786
#endif
1787
#ifdef CONFIG_PERF_EVENTS
P
Peter Zijlstra 已提交
1788
	struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts];
1789 1790
	struct mutex perf_event_mutex;
	struct list_head perf_event_list;
1791
#endif
1792 1793 1794
#ifdef CONFIG_DEBUG_PREEMPT
	unsigned long preempt_disable_ip;
#endif
1795
#ifdef CONFIG_NUMA
1796
	struct mempolicy *mempolicy;	/* Protected by alloc_lock */
1797
	short il_next;
1798
	short pref_node_fork;
1799
#endif
1800 1801 1802
#ifdef CONFIG_NUMA_BALANCING
	int numa_scan_seq;
	unsigned int numa_scan_period;
1803
	unsigned int numa_scan_period_max;
1804
	int numa_preferred_nid;
1805
	unsigned long numa_migrate_retry;
1806
	u64 node_stamp;			/* migration stamp  */
1807 1808
	u64 last_task_numa_placement;
	u64 last_sum_exec_runtime;
1809
	struct callback_head numa_work;
1810

1811 1812 1813
	struct list_head numa_entry;
	struct numa_group *numa_group;

1814
	/*
1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826
	 * numa_faults is an array split into four regions:
	 * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer
	 * in this precise order.
	 *
	 * faults_memory: Exponential decaying average of faults on a per-node
	 * basis. Scheduling placement decisions are made based on these
	 * counts. The values remain static for the duration of a PTE scan.
	 * faults_cpu: Track the nodes the process was running on when a NUMA
	 * hinting fault was incurred.
	 * faults_memory_buffer and faults_cpu_buffer: Record faults per node
	 * during the current scan window. When the scan completes, the counts
	 * in faults_memory and faults_cpu decay and these values are copied.
1827
	 */
1828
	unsigned long *numa_faults;
1829
	unsigned long total_numa_faults;
1830

1831 1832
	/*
	 * numa_faults_locality tracks if faults recorded during the last
1833 1834 1835
	 * scan window were remote/local or failed to migrate. The task scan
	 * period is adapted based on the locality of the faults with different
	 * weights depending on whether they were shared or private faults
1836
	 */
1837
	unsigned long numa_faults_locality[3];
1838

I
Ingo Molnar 已提交
1839
	unsigned long numa_pages_migrated;
1840 1841
#endif /* CONFIG_NUMA_BALANCING */

1842 1843 1844 1845
#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
	struct tlbflush_unmap_batch tlb_ubc;
#endif

I
Ingo Molnar 已提交
1846
	struct rcu_head rcu;
1847 1848 1849 1850 1851

	/*
	 * cache last used pipe for splice
	 */
	struct pipe_inode_info *splice_pipe;
1852 1853 1854

	struct page_frag task_frag;

1855 1856
#ifdef	CONFIG_TASK_DELAY_ACCT
	struct task_delay_info *delays;
1857 1858 1859
#endif
#ifdef CONFIG_FAULT_INJECTION
	int make_it_fail;
1860
#endif
1861 1862 1863 1864 1865 1866
	/*
	 * when (nr_dirtied >= nr_dirtied_pause), it's time to call
	 * balance_dirty_pages() for some dirty throttling pause
	 */
	int nr_dirtied;
	int nr_dirtied_pause;
1867
	unsigned long dirty_paused_when; /* start of a write-and-pause period */
1868

A
Arjan van de Ven 已提交
1869 1870 1871 1872
#ifdef CONFIG_LATENCYTOP
	int latency_record_count;
	struct latency_record latency_record[LT_SAVECOUNT];
#endif
1873 1874 1875 1876
	/*
	 * time slack values; these are used to round up poll() and
	 * select() etc timeout values. These are in nanoseconds.
	 */
1877 1878
	u64 timer_slack_ns;
	u64 default_timer_slack_ns;
1879

1880 1881 1882
#ifdef CONFIG_KASAN
	unsigned int kasan_depth;
#endif
1883
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
D
Daniel Mack 已提交
1884
	/* Index of current stored address in ret_stack */
1885 1886 1887
	int curr_ret_stack;
	/* Stack of return addresses for return function tracing */
	struct ftrace_ret_stack	*ret_stack;
1888 1889
	/* time stamp for last schedule */
	unsigned long long ftrace_timestamp;
1890 1891 1892 1893 1894
	/*
	 * Number of functions that haven't been traced
	 * because of depth overrun.
	 */
	atomic_t trace_overrun;
1895 1896
	/* Pause for the tracing */
	atomic_t tracing_graph_pause;
1897
#endif
1898 1899 1900
#ifdef CONFIG_TRACING
	/* state flags for use by tracers */
	unsigned long trace;
1901
	/* bitmask and counter of trace recursion */
1902 1903
	unsigned long trace_recursion;
#endif /* CONFIG_TRACING */
D
Dmitry Vyukov 已提交
1904 1905 1906 1907 1908 1909 1910 1911 1912 1913
#ifdef CONFIG_KCOV
	/* Coverage collection mode enabled for this task (0 if disabled). */
	enum kcov_mode kcov_mode;
	/* Size of the kcov_area. */
	unsigned	kcov_size;
	/* Buffer for coverage collection. */
	void		*kcov_area;
	/* kcov desciptor wired with this task or NULL. */
	struct kcov	*kcov;
#endif
1914
#ifdef CONFIG_MEMCG
T
Tejun Heo 已提交
1915 1916 1917
	struct mem_cgroup *memcg_in_oom;
	gfp_t memcg_oom_gfp_mask;
	int memcg_oom_order;
1918 1919 1920

	/* number of pages to reclaim on returning to userland */
	unsigned int memcg_nr_pages_over_high;
1921
#endif
1922 1923 1924
#ifdef CONFIG_UPROBES
	struct uprobe_task *utask;
#endif
K
Kent Overstreet 已提交
1925 1926 1927 1928
#if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE)
	unsigned int	sequential_io;
	unsigned int	sequential_io_avg;
#endif
P
Peter Zijlstra 已提交
1929 1930 1931
#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
	unsigned long	task_state_change;
#endif
1932
	int pagefault_disabled;
1933
#ifdef CONFIG_MMU
1934
	struct task_struct *oom_reaper_list;
1935
#endif
1936 1937 1938
#ifdef CONFIG_VMAP_STACK
	struct vm_struct *stack_vm_area;
#endif
1939 1940 1941 1942 1943 1944 1945 1946
/* CPU-specific state of this task */
	struct thread_struct thread;
/*
 * WARNING: on x86, 'thread_struct' contains a variable-sized
 * structure.  It *MUST* be at the end of 'task_struct'.
 *
 * Do not put anything below here!
 */
L
Linus Torvalds 已提交
1947 1948
};

1949 1950 1951 1952 1953
#ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
extern int arch_task_struct_size __read_mostly;
#else
# define arch_task_struct_size (sizeof(struct task_struct))
#endif
1954

1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966
#ifdef CONFIG_VMAP_STACK
static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
{
	return t->stack_vm_area;
}
#else
static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
{
	return NULL;
}
#endif

1967
/* Future-safe accessor for struct task_struct's cpus_allowed. */
1968
#define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed)
1969

1970 1971 1972 1973 1974
static inline int tsk_nr_cpus_allowed(struct task_struct *p)
{
	return p->nr_cpus_allowed;
}

1975 1976
#define TNF_MIGRATED	0x01
#define TNF_NO_GROUP	0x02
1977
#define TNF_SHARED	0x04
1978
#define TNF_FAULT_LOCAL	0x08
1979
#define TNF_MIGRATE_FAIL 0x10
1980

1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
static inline bool in_vfork(struct task_struct *tsk)
{
	bool ret;

	/*
	 * need RCU to access ->real_parent if CLONE_VM was used along with
	 * CLONE_PARENT.
	 *
	 * We check real_parent->mm == tsk->mm because CLONE_VFORK does not
	 * imply CLONE_VM
	 *
	 * CLONE_VFORK can be used with CLONE_PARENT/CLONE_THREAD and thus
	 * ->real_parent is not necessarily the task doing vfork(), so in
	 * theory we can't rely on task_lock() if we want to dereference it.
	 *
	 * And in this case we can't trust the real_parent->mm == tsk->mm
	 * check, it can be false negative. But we do not care, if init or
	 * another oom-unkillable task does this it should blame itself.
	 */
	rcu_read_lock();
	ret = tsk->vfork_done && tsk->real_parent->mm == tsk->mm;
	rcu_read_unlock();

	return ret;
}

2007
#ifdef CONFIG_NUMA_BALANCING
2008
extern void task_numa_fault(int last_node, int node, int pages, int flags);
2009
extern pid_t task_numa_group_id(struct task_struct *p);
2010
extern void set_numabalancing_state(bool enabled);
2011
extern void task_numa_free(struct task_struct *p);
2012 2013
extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page,
					int src_nid, int dst_cpu);
2014
#else
2015
static inline void task_numa_fault(int last_node, int node, int pages,
2016
				   int flags)
2017 2018
{
}
2019 2020 2021 2022
static inline pid_t task_numa_group_id(struct task_struct *p)
{
	return 0;
}
2023 2024 2025
static inline void set_numabalancing_state(bool enabled)
{
}
2026 2027 2028
static inline void task_numa_free(struct task_struct *p)
{
}
2029 2030 2031 2032 2033
static inline bool should_numa_migrate_memory(struct task_struct *p,
				struct page *page, int src_nid, int dst_cpu)
{
	return true;
}
2034 2035
#endif

A
Alexey Dobriyan 已提交
2036
static inline struct pid *task_pid(struct task_struct *task)
2037 2038 2039 2040
{
	return task->pids[PIDTYPE_PID].pid;
}

A
Alexey Dobriyan 已提交
2041
static inline struct pid *task_tgid(struct task_struct *task)
2042 2043 2044 2045
{
	return task->group_leader->pids[PIDTYPE_PID].pid;
}

2046 2047 2048 2049 2050
/*
 * Without tasklist or rcu lock it is not safe to dereference
 * the result of task_pgrp/task_session even if task == current,
 * we can race with another thread doing sys_setsid/sys_setpgid.
 */
A
Alexey Dobriyan 已提交
2051
static inline struct pid *task_pgrp(struct task_struct *task)
2052 2053 2054 2055
{
	return task->group_leader->pids[PIDTYPE_PGID].pid;
}

A
Alexey Dobriyan 已提交
2056
static inline struct pid *task_session(struct task_struct *task)
2057 2058 2059 2060
{
	return task->group_leader->pids[PIDTYPE_SID].pid;
}

2061 2062 2063 2064 2065 2066 2067
struct pid_namespace;

/*
 * the helpers to get the task's different pids as they are seen
 * from various namespaces
 *
 * task_xid_nr()     : global id, i.e. the id seen from the init namespace;
E
Eric W. Biederman 已提交
2068 2069
 * task_xid_vnr()    : virtual id, i.e. the id seen from the pid namespace of
 *                     current.
2070 2071 2072 2073 2074 2075
 * task_xid_nr_ns()  : id seen from the ns specified;
 *
 * set_task_vxid()   : assigns a virtual id to a task;
 *
 * see also pid_nr() etc in include/linux/pid.h
 */
2076 2077
pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
			struct pid_namespace *ns);
2078

A
Alexey Dobriyan 已提交
2079
static inline pid_t task_pid_nr(struct task_struct *tsk)
2080 2081 2082 2083
{
	return tsk->pid;
}

2084 2085 2086 2087 2088
static inline pid_t task_pid_nr_ns(struct task_struct *tsk,
					struct pid_namespace *ns)
{
	return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns);
}
2089 2090 2091

static inline pid_t task_pid_vnr(struct task_struct *tsk)
{
2092
	return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL);
2093 2094 2095
}


A
Alexey Dobriyan 已提交
2096
static inline pid_t task_tgid_nr(struct task_struct *tsk)
2097 2098 2099 2100
{
	return tsk->tgid;
}

2101
pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns);
2102 2103 2104 2105 2106 2107 2108

static inline pid_t task_tgid_vnr(struct task_struct *tsk)
{
	return pid_vnr(task_tgid(tsk));
}


2109
static inline int pid_alive(const struct task_struct *p);
2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126
static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns)
{
	pid_t pid = 0;

	rcu_read_lock();
	if (pid_alive(tsk))
		pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns);
	rcu_read_unlock();

	return pid;
}

static inline pid_t task_ppid_nr(const struct task_struct *tsk)
{
	return task_ppid_nr_ns(tsk, &init_pid_ns);
}

2127 2128
static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk,
					struct pid_namespace *ns)
2129
{
2130
	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns);
2131 2132 2133 2134
}

static inline pid_t task_pgrp_vnr(struct task_struct *tsk)
{
2135
	return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL);
2136 2137 2138
}


2139 2140
static inline pid_t task_session_nr_ns(struct task_struct *tsk,
					struct pid_namespace *ns)
2141
{
2142
	return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns);
2143 2144 2145 2146
}

static inline pid_t task_session_vnr(struct task_struct *tsk)
{
2147
	return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL);
2148 2149
}

2150 2151 2152 2153 2154
/* obsolete, do not use */
static inline pid_t task_pgrp_nr(struct task_struct *tsk)
{
	return task_pgrp_nr_ns(tsk, &init_pid_ns);
}
2155

L
Linus Torvalds 已提交
2156 2157 2158 2159 2160 2161 2162
/**
 * pid_alive - check that a task structure is not stale
 * @p: Task structure to be checked.
 *
 * Test if a process is not yet dead (at most zombie state)
 * If pid_alive fails, then pointers within the task structure
 * can be stale and must not be dereferenced.
2163 2164
 *
 * Return: 1 if the process is alive. 0 otherwise.
L
Linus Torvalds 已提交
2165
 */
2166
static inline int pid_alive(const struct task_struct *p)
L
Linus Torvalds 已提交
2167
{
2168
	return p->pids[PIDTYPE_PID].pid != NULL;
L
Linus Torvalds 已提交
2169 2170
}

2171
/**
2172 2173
 * is_global_init - check if a task structure is init. Since init
 * is free to have sub-threads we need to check tgid.
2174 2175 2176
 * @tsk: Task structure to be checked.
 *
 * Check if a task structure is the first user space task the kernel created.
2177 2178
 *
 * Return: 1 if the task structure is init. 0 otherwise.
2179
 */
A
Alexey Dobriyan 已提交
2180
static inline int is_global_init(struct task_struct *tsk)
2181
{
2182
	return task_tgid_nr(tsk) == 1;
2183
}
2184

2185 2186
extern struct pid *cad_pid;

L
Linus Torvalds 已提交
2187 2188
extern void free_task(struct task_struct *tsk);
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
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2190
extern void __put_task_struct(struct task_struct *t);
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2191 2192 2193 2194

static inline void put_task_struct(struct task_struct *t)
{
	if (atomic_dec_and_test(&t->usage))
2195
		__put_task_struct(t);
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2196
}
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2197

2198 2199 2200
struct task_struct *task_rcu_dereference(struct task_struct **ptask);
struct task_struct *try_get_task_struct(struct task_struct **ptask);

2201 2202 2203 2204 2205 2206 2207
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
extern void task_cputime(struct task_struct *t,
			 cputime_t *utime, cputime_t *stime);
extern void task_cputime_scaled(struct task_struct *t,
				cputime_t *utimescaled, cputime_t *stimescaled);
extern cputime_t task_gtime(struct task_struct *t);
#else
2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225
static inline void task_cputime(struct task_struct *t,
				cputime_t *utime, cputime_t *stime)
{
	if (utime)
		*utime = t->utime;
	if (stime)
		*stime = t->stime;
}

static inline void task_cputime_scaled(struct task_struct *t,
				       cputime_t *utimescaled,
				       cputime_t *stimescaled)
{
	if (utimescaled)
		*utimescaled = t->utimescaled;
	if (stimescaled)
		*stimescaled = t->stimescaled;
}
2226 2227 2228 2229 2230 2231

static inline cputime_t task_gtime(struct task_struct *t)
{
	return t->gtime;
}
#endif
2232 2233
extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
2234

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/*
 * Per process flags
 */
#define PF_EXITING	0x00000004	/* getting shut down */
2239
#define PF_EXITPIDONE	0x00000008	/* pi exit done on shut down */
2240
#define PF_VCPU		0x00000010	/* I'm a virtual CPU */
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Tejun Heo 已提交
2241
#define PF_WQ_WORKER	0x00000020	/* I'm a workqueue worker */
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2242
#define PF_FORKNOEXEC	0x00000040	/* forked but didn't exec */
2243
#define PF_MCE_PROCESS  0x00000080      /* process policy on mce errors */
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2244 2245 2246 2247
#define PF_SUPERPRIV	0x00000100	/* used super-user privileges */
#define PF_DUMPCORE	0x00000200	/* dumped core */
#define PF_SIGNALED	0x00000400	/* killed by a signal */
#define PF_MEMALLOC	0x00000800	/* Allocating memory */
2248
#define PF_NPROC_EXCEEDED 0x00001000	/* set_user noticed that RLIMIT_NPROC was exceeded */
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#define PF_USED_MATH	0x00002000	/* if unset the fpu must be initialized before use */
2250
#define PF_USED_ASYNC	0x00004000	/* used async_schedule*(), used by module init */
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#define PF_NOFREEZE	0x00008000	/* this thread should not be frozen */
#define PF_FROZEN	0x00010000	/* frozen for system suspend */
#define PF_FSTRANS	0x00020000	/* inside a filesystem transaction */
#define PF_KSWAPD	0x00040000	/* I am kswapd */
2255
#define PF_MEMALLOC_NOIO 0x00080000	/* Allocating memory without IO involved */
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#define PF_LESS_THROTTLE 0x00100000	/* Throttle me less: I clean memory */
2257
#define PF_KTHREAD	0x00200000	/* I am a kernel thread */
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2258 2259
#define PF_RANDOMIZE	0x00400000	/* randomize virtual address space */
#define PF_SWAPWRITE	0x00800000	/* Allowed to write to swap */
2260
#define PF_NO_SETAFFINITY 0x04000000	/* Userland is not allowed to meddle with cpus_allowed */
2261
#define PF_MCE_EARLY    0x08000000      /* Early kill for mce process policy */
2262
#define PF_MUTEX_TESTER	0x20000000	/* Thread belongs to the rt mutex tester */
2263
#define PF_FREEZER_SKIP	0x40000000	/* Freezer should not count it as freezable */
2264
#define PF_SUSPEND_TASK 0x80000000      /* this thread called freeze_processes and should not be frozen */
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/*
 * Only the _current_ task can read/write to tsk->flags, but other
 * tasks can access tsk->flags in readonly mode for example
 * with tsk_used_math (like during threaded core dumping).
 * There is however an exception to this rule during ptrace
 * or during fork: the ptracer task is allowed to write to the
 * child->flags of its traced child (same goes for fork, the parent
 * can write to the child->flags), because we're guaranteed the
 * child is not running and in turn not changing child->flags
 * at the same time the parent does it.
 */
#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0)
#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0)
#define clear_used_math() clear_stopped_child_used_math(current)
#define set_used_math() set_stopped_child_used_math(current)
#define conditional_stopped_child_used_math(condition, child) \
	do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0)
#define conditional_used_math(condition) \
	conditional_stopped_child_used_math(condition, current)
#define copy_to_stopped_child_used_math(child) \
	do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0)
/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */
#define tsk_used_math(p) ((p)->flags & PF_USED_MATH)
#define used_math() tsk_used_math(current)

2291 2292 2293
/* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags
 * __GFP_FS is also cleared as it implies __GFP_IO.
 */
2294 2295 2296
static inline gfp_t memalloc_noio_flags(gfp_t flags)
{
	if (unlikely(current->flags & PF_MEMALLOC_NOIO))
2297
		flags &= ~(__GFP_IO | __GFP_FS);
2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312
	return flags;
}

static inline unsigned int memalloc_noio_save(void)
{
	unsigned int flags = current->flags & PF_MEMALLOC_NOIO;
	current->flags |= PF_MEMALLOC_NOIO;
	return flags;
}

static inline void memalloc_noio_restore(unsigned int flags)
{
	current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags;
}

2313
/* Per-process atomic flags. */
2314
#define PFA_NO_NEW_PRIVS 0	/* May not gain new privileges. */
2315 2316
#define PFA_SPREAD_PAGE  1      /* Spread page cache over cpuset */
#define PFA_SPREAD_SLAB  2      /* Spread some slab caches over cpuset */
2317
#define PFA_LMK_WAITING  3      /* Lowmemorykiller is waiting */
2318

2319

2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331
#define TASK_PFA_TEST(name, func)					\
	static inline bool task_##func(struct task_struct *p)		\
	{ return test_bit(PFA_##name, &p->atomic_flags); }
#define TASK_PFA_SET(name, func)					\
	static inline void task_set_##func(struct task_struct *p)	\
	{ set_bit(PFA_##name, &p->atomic_flags); }
#define TASK_PFA_CLEAR(name, func)					\
	static inline void task_clear_##func(struct task_struct *p)	\
	{ clear_bit(PFA_##name, &p->atomic_flags); }

TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs)
TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs)
2332

2333 2334 2335 2336 2337 2338 2339
TASK_PFA_TEST(SPREAD_PAGE, spread_page)
TASK_PFA_SET(SPREAD_PAGE, spread_page)
TASK_PFA_CLEAR(SPREAD_PAGE, spread_page)

TASK_PFA_TEST(SPREAD_SLAB, spread_slab)
TASK_PFA_SET(SPREAD_SLAB, spread_slab)
TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab)
2340

2341 2342 2343
TASK_PFA_TEST(LMK_WAITING, lmk_waiting)
TASK_PFA_SET(LMK_WAITING, lmk_waiting)

2344
/*
2345
 * task->jobctl flags
2346
 */
2347
#define JOBCTL_STOP_SIGMASK	0xffff	/* signr of the last group stop */
2348

2349 2350 2351
#define JOBCTL_STOP_DEQUEUED_BIT 16	/* stop signal dequeued */
#define JOBCTL_STOP_PENDING_BIT	17	/* task should stop for group stop */
#define JOBCTL_STOP_CONSUME_BIT	18	/* consume group stop count */
2352
#define JOBCTL_TRAP_STOP_BIT	19	/* trap for STOP */
2353
#define JOBCTL_TRAP_NOTIFY_BIT	20	/* trap for NOTIFY */
2354
#define JOBCTL_TRAPPING_BIT	21	/* switching to TRACED */
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Tejun Heo 已提交
2355
#define JOBCTL_LISTENING_BIT	22	/* ptracer is listening for events */
2356

2357 2358 2359 2360 2361 2362 2363
#define JOBCTL_STOP_DEQUEUED	(1UL << JOBCTL_STOP_DEQUEUED_BIT)
#define JOBCTL_STOP_PENDING	(1UL << JOBCTL_STOP_PENDING_BIT)
#define JOBCTL_STOP_CONSUME	(1UL << JOBCTL_STOP_CONSUME_BIT)
#define JOBCTL_TRAP_STOP	(1UL << JOBCTL_TRAP_STOP_BIT)
#define JOBCTL_TRAP_NOTIFY	(1UL << JOBCTL_TRAP_NOTIFY_BIT)
#define JOBCTL_TRAPPING		(1UL << JOBCTL_TRAPPING_BIT)
#define JOBCTL_LISTENING	(1UL << JOBCTL_LISTENING_BIT)
2364

2365
#define JOBCTL_TRAP_MASK	(JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY)
2366
#define JOBCTL_PENDING_MASK	(JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK)
2367

2368
extern bool task_set_jobctl_pending(struct task_struct *task,
2369
				    unsigned long mask);
2370
extern void task_clear_jobctl_trapping(struct task_struct *task);
2371
extern void task_clear_jobctl_pending(struct task_struct *task,
2372
				      unsigned long mask);
2373

2374 2375
static inline void rcu_copy_process(struct task_struct *p)
{
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Paul E. McKenney 已提交
2376
#ifdef CONFIG_PREEMPT_RCU
2377
	p->rcu_read_lock_nesting = 0;
2378
	p->rcu_read_unlock_special.s = 0;
2379
	p->rcu_blocked_node = NULL;
2380
	INIT_LIST_HEAD(&p->rcu_node_entry);
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2381 2382 2383 2384
#endif /* #ifdef CONFIG_PREEMPT_RCU */
#ifdef CONFIG_TASKS_RCU
	p->rcu_tasks_holdout = false;
	INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
2385
	p->rcu_tasks_idle_cpu = -1;
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Paul E. McKenney 已提交
2386
#endif /* #ifdef CONFIG_TASKS_RCU */
2387 2388
}

2389 2390 2391 2392 2393 2394 2395
static inline void tsk_restore_flags(struct task_struct *task,
				unsigned long orig_flags, unsigned long flags)
{
	task->flags &= ~flags;
	task->flags |= orig_flags & flags;
}

2396 2397
extern int cpuset_cpumask_can_shrink(const struct cpumask *cur,
				     const struct cpumask *trial);
2398 2399
extern int task_can_attach(struct task_struct *p,
			   const struct cpumask *cs_cpus_allowed);
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#ifdef CONFIG_SMP
2401 2402 2403
extern void do_set_cpus_allowed(struct task_struct *p,
			       const struct cpumask *new_mask);

2404
extern int set_cpus_allowed_ptr(struct task_struct *p,
2405
				const struct cpumask *new_mask);
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2406
#else
2407 2408 2409 2410
static inline void do_set_cpus_allowed(struct task_struct *p,
				      const struct cpumask *new_mask)
{
}
2411
static inline int set_cpus_allowed_ptr(struct task_struct *p,
2412
				       const struct cpumask *new_mask)
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2413
{
2414
	if (!cpumask_test_cpu(0, new_mask))
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2415 2416 2417 2418
		return -EINVAL;
	return 0;
}
#endif
2419

2420
#ifdef CONFIG_NO_HZ_COMMON
2421 2422 2423 2424 2425
void calc_load_enter_idle(void);
void calc_load_exit_idle(void);
#else
static inline void calc_load_enter_idle(void) { }
static inline void calc_load_exit_idle(void) { }
2426
#endif /* CONFIG_NO_HZ_COMMON */
2427

2428
/*
2429 2430 2431 2432 2433 2434
 * Do not use outside of architecture code which knows its limitations.
 *
 * sched_clock() has no promise of monotonicity or bounded drift between
 * CPUs, use (which you should not) requires disabling IRQs.
 *
 * Please use one of the three interfaces below.
2435
 */
2436
extern unsigned long long notrace sched_clock(void);
2437
/*
2438
 * See the comment in kernel/sched/clock.c
2439
 */
2440
extern u64 running_clock(void);
2441 2442
extern u64 sched_clock_cpu(int cpu);

2443

2444
extern void sched_clock_init(void);
2445

2446
#ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK
2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457
static inline void sched_clock_tick(void)
{
}

static inline void sched_clock_idle_sleep_event(void)
{
}

static inline void sched_clock_idle_wakeup_event(u64 delta_ns)
{
}
2458 2459 2460 2461 2462 2463 2464 2465 2466 2467

static inline u64 cpu_clock(int cpu)
{
	return sched_clock();
}

static inline u64 local_clock(void)
{
	return sched_clock();
}
2468
#else
2469 2470 2471 2472 2473 2474
/*
 * Architectures can set this to 1 if they have specified
 * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig,
 * but then during bootup it turns out that sched_clock()
 * is reliable after all:
 */
2475 2476 2477
extern int sched_clock_stable(void);
extern void set_sched_clock_stable(void);
extern void clear_sched_clock_stable(void);
2478

2479 2480 2481
extern void sched_clock_tick(void);
extern void sched_clock_idle_sleep_event(void);
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501

/*
 * As outlined in clock.c, provides a fast, high resolution, nanosecond
 * time source that is monotonic per cpu argument and has bounded drift
 * between cpus.
 *
 * ######################### BIG FAT WARNING ##########################
 * # when comparing cpu_clock(i) to cpu_clock(j) for i != j, time can #
 * # go backwards !!                                                  #
 * ####################################################################
 */
static inline u64 cpu_clock(int cpu)
{
	return sched_clock_cpu(cpu);
}

static inline u64 local_clock(void)
{
	return sched_clock_cpu(raw_smp_processor_id());
}
2502 2503
#endif

2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516
#ifdef CONFIG_IRQ_TIME_ACCOUNTING
/*
 * An i/f to runtime opt-in for irq time accounting based off of sched_clock.
 * The reason for this explicit opt-in is not to have perf penalty with
 * slow sched_clocks.
 */
extern void enable_sched_clock_irqtime(void);
extern void disable_sched_clock_irqtime(void);
#else
static inline void enable_sched_clock_irqtime(void) {}
static inline void disable_sched_clock_irqtime(void) {}
#endif

2517
extern unsigned long long
2518
task_sched_runtime(struct task_struct *task);
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2519 2520 2521 2522 2523 2524 2525 2526

/* sched_exec is called by processes performing an exec */
#ifdef CONFIG_SMP
extern void sched_exec(void);
#else
#define sched_exec()   {}
#endif

2527 2528
extern void sched_clock_idle_sleep_event(void);
extern void sched_clock_idle_wakeup_event(u64 delta_ns);
2529

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2530 2531 2532 2533 2534 2535
#ifdef CONFIG_HOTPLUG_CPU
extern void idle_task_exit(void);
#else
static inline void idle_task_exit(void) {}
#endif

2536
#if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
2537
extern void wake_up_nohz_cpu(int cpu);
2538
#else
2539
static inline void wake_up_nohz_cpu(int cpu) { }
2540 2541
#endif

2542
#ifdef CONFIG_NO_HZ_FULL
2543
extern u64 scheduler_tick_max_deferment(void);
2544 2545
#endif

2546 2547 2548 2549 2550 2551 2552
#ifdef CONFIG_SCHED_AUTOGROUP
extern void sched_autogroup_create_attach(struct task_struct *p);
extern void sched_autogroup_detach(struct task_struct *p);
extern void sched_autogroup_fork(struct signal_struct *sig);
extern void sched_autogroup_exit(struct signal_struct *sig);
#ifdef CONFIG_PROC_FS
extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m);
2553
extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice);
2554 2555 2556 2557 2558 2559 2560 2561
#endif
#else
static inline void sched_autogroup_create_attach(struct task_struct *p) { }
static inline void sched_autogroup_detach(struct task_struct *p) { }
static inline void sched_autogroup_fork(struct signal_struct *sig) { }
static inline void sched_autogroup_exit(struct signal_struct *sig) { }
#endif

2562
extern int yield_to(struct task_struct *p, bool preempt);
2563 2564
extern void set_user_nice(struct task_struct *p, long nice);
extern int task_prio(const struct task_struct *p);
2565 2566 2567 2568 2569 2570 2571 2572 2573 2574
/**
 * task_nice - return the nice value of a given task.
 * @p: the task in question.
 *
 * Return: The nice value [ -20 ... 0 ... 19 ].
 */
static inline int task_nice(const struct task_struct *p)
{
	return PRIO_TO_NICE((p)->static_prio);
}
2575 2576
extern int can_nice(const struct task_struct *p, const int nice);
extern int task_curr(const struct task_struct *p);
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2577
extern int idle_cpu(int cpu);
2578 2579
extern int sched_setscheduler(struct task_struct *, int,
			      const struct sched_param *);
2580
extern int sched_setscheduler_nocheck(struct task_struct *, int,
2581
				      const struct sched_param *);
2582 2583
extern int sched_setattr(struct task_struct *,
			 const struct sched_attr *);
2584
extern struct task_struct *idle_task(int cpu);
2585 2586
/**
 * is_idle_task - is the specified task an idle task?
2587
 * @p: the task in question.
2588 2589
 *
 * Return: 1 if @p is an idle task. 0 otherwise.
2590
 */
2591
static inline bool is_idle_task(const struct task_struct *p)
2592 2593 2594
{
	return p->pid == 0;
}
2595 2596
extern struct task_struct *curr_task(int cpu);
extern void set_curr_task(int cpu, struct task_struct *p);
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2597 2598 2599 2600

void yield(void);

union thread_union {
2601
#ifndef CONFIG_THREAD_INFO_IN_TASK
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2602
	struct thread_info thread_info;
2603
#endif
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	unsigned long stack[THREAD_SIZE/sizeof(long)];
};

#ifndef __HAVE_ARCH_KSTACK_END
static inline int kstack_end(void *addr)
{
	/* Reliable end of stack detection:
	 * Some APM bios versions misalign the stack
	 */
	return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*)));
}
#endif

extern union thread_union init_thread_union;
extern struct task_struct init_task;

extern struct   mm_struct init_mm;

2622 2623 2624 2625 2626 2627 2628
extern struct pid_namespace init_pid_ns;

/*
 * find a task by one of its numerical ids
 *
 * find_task_by_pid_ns():
 *      finds a task by its pid in the specified namespace
2629 2630
 * find_task_by_vpid():
 *      finds a task by its virtual pid
2631
 *
2632
 * see also find_vpid() etc in include/linux/pid.h
2633 2634
 */

2635 2636 2637
extern struct task_struct *find_task_by_vpid(pid_t nr);
extern struct task_struct *find_task_by_pid_ns(pid_t nr,
		struct pid_namespace *ns);
2638

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Linus Torvalds 已提交
2639
/* per-UID process charging. */
2640
extern struct user_struct * alloc_uid(kuid_t);
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static inline struct user_struct *get_uid(struct user_struct *u)
{
	atomic_inc(&u->__count);
	return u;
}
extern void free_uid(struct user_struct *);

#include <asm/current.h>

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2650
extern void xtime_update(unsigned long ticks);
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2651

2652 2653
extern int wake_up_state(struct task_struct *tsk, unsigned int state);
extern int wake_up_process(struct task_struct *tsk);
2654
extern void wake_up_new_task(struct task_struct *tsk);
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2655 2656 2657 2658 2659
#ifdef CONFIG_SMP
 extern void kick_process(struct task_struct *tsk);
#else
 static inline void kick_process(struct task_struct *tsk) { }
#endif
2660
extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
2661
extern void sched_dead(struct task_struct *p);
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2662 2663 2664

extern void proc_caches_init(void);
extern void flush_signals(struct task_struct *);
2665
extern void ignore_signals(struct task_struct *);
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2666 2667 2668
extern void flush_signal_handlers(struct task_struct *, int force_default);
extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info);

2669
static inline int kernel_dequeue_signal(siginfo_t *info)
L
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2670
{
2671 2672
	struct task_struct *tsk = current;
	siginfo_t __info;
L
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2673 2674
	int ret;

2675 2676 2677
	spin_lock_irq(&tsk->sighand->siglock);
	ret = dequeue_signal(tsk, &tsk->blocked, info ?: &__info);
	spin_unlock_irq(&tsk->sighand->siglock);
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2678 2679

	return ret;
2680
}
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2681

2682 2683 2684 2685 2686 2687 2688 2689 2690 2691
static inline void kernel_signal_stop(void)
{
	spin_lock_irq(&current->sighand->siglock);
	if (current->jobctl & JOBCTL_STOP_DEQUEUED)
		__set_current_state(TASK_STOPPED);
	spin_unlock_irq(&current->sighand->siglock);

	schedule();
}

L
Linus Torvalds 已提交
2692 2693 2694 2695
extern void release_task(struct task_struct * p);
extern int send_sig_info(int, struct siginfo *, struct task_struct *);
extern int force_sigsegv(int, struct task_struct *);
extern int force_sig_info(int, struct siginfo *, struct task_struct *);
2696 2697
extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp);
extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid);
2698 2699
extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *,
				const struct cred *, u32);
2700 2701
extern int kill_pgrp(struct pid *pid, int sig, int priv);
extern int kill_pid(struct pid *pid, int sig, int priv);
2702
extern int kill_proc_info(int, struct siginfo *, pid_t);
2703
extern __must_check bool do_notify_parent(struct task_struct *, int);
2704
extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent);
L
Linus Torvalds 已提交
2705 2706
extern void force_sig(int, struct task_struct *);
extern int send_sig(int, struct task_struct *, int);
2707
extern int zap_other_threads(struct task_struct *p);
L
Linus Torvalds 已提交
2708 2709
extern struct sigqueue *sigqueue_alloc(void);
extern void sigqueue_free(struct sigqueue *);
2710
extern int send_sigqueue(struct sigqueue *,  struct task_struct *, int group);
2711
extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *);
L
Linus Torvalds 已提交
2712

2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772
#ifdef TIF_RESTORE_SIGMASK
/*
 * Legacy restore_sigmask accessors.  These are inefficient on
 * SMP architectures because they require atomic operations.
 */

/**
 * set_restore_sigmask() - make sure saved_sigmask processing gets done
 *
 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
 * will run before returning to user mode, to process the flag.  For
 * all callers, TIF_SIGPENDING is already set or it's no harm to set
 * it.  TIF_RESTORE_SIGMASK need not be in the set of bits that the
 * arch code will notice on return to user mode, in case those bits
 * are scarce.  We set TIF_SIGPENDING here to ensure that the arch
 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
 */
static inline void set_restore_sigmask(void)
{
	set_thread_flag(TIF_RESTORE_SIGMASK);
	WARN_ON(!test_thread_flag(TIF_SIGPENDING));
}
static inline void clear_restore_sigmask(void)
{
	clear_thread_flag(TIF_RESTORE_SIGMASK);
}
static inline bool test_restore_sigmask(void)
{
	return test_thread_flag(TIF_RESTORE_SIGMASK);
}
static inline bool test_and_clear_restore_sigmask(void)
{
	return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
}

#else	/* TIF_RESTORE_SIGMASK */

/* Higher-quality implementation, used if TIF_RESTORE_SIGMASK doesn't exist. */
static inline void set_restore_sigmask(void)
{
	current->restore_sigmask = true;
	WARN_ON(!test_thread_flag(TIF_SIGPENDING));
}
static inline void clear_restore_sigmask(void)
{
	current->restore_sigmask = false;
}
static inline bool test_restore_sigmask(void)
{
	return current->restore_sigmask;
}
static inline bool test_and_clear_restore_sigmask(void)
{
	if (!current->restore_sigmask)
		return false;
	current->restore_sigmask = false;
	return true;
}
#endif

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Al Viro 已提交
2773 2774 2775
static inline void restore_saved_sigmask(void)
{
	if (test_and_clear_restore_sigmask())
2776
		__set_current_blocked(&current->saved_sigmask);
A
Al Viro 已提交
2777 2778
}

A
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2779 2780 2781 2782 2783 2784 2785 2786
static inline sigset_t *sigmask_to_save(void)
{
	sigset_t *res = &current->blocked;
	if (unlikely(test_restore_sigmask()))
		res = &current->saved_sigmask;
	return res;
}

2787 2788 2789 2790 2791
static inline int kill_cad_pid(int sig, int priv)
{
	return kill_pid(cad_pid, sig, priv);
}

L
Linus Torvalds 已提交
2792 2793 2794 2795 2796
/* These can be the second arg to send_sig_info/send_group_sig_info.  */
#define SEND_SIG_NOINFO ((struct siginfo *) 0)
#define SEND_SIG_PRIV	((struct siginfo *) 1)
#define SEND_SIG_FORCED	((struct siginfo *) 2)

2797 2798 2799
/*
 * True if we are on the alternate signal stack.
 */
L
Linus Torvalds 已提交
2800 2801
static inline int on_sig_stack(unsigned long sp)
{
2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813
	/*
	 * If the signal stack is SS_AUTODISARM then, by construction, we
	 * can't be on the signal stack unless user code deliberately set
	 * SS_AUTODISARM when we were already on it.
	 *
	 * This improves reliability: if user state gets corrupted such that
	 * the stack pointer points very close to the end of the signal stack,
	 * then this check will enable the signal to be handled anyway.
	 */
	if (current->sas_ss_flags & SS_AUTODISARM)
		return 0;

2814 2815 2816 2817 2818 2819 2820
#ifdef CONFIG_STACK_GROWSUP
	return sp >= current->sas_ss_sp &&
		sp - current->sas_ss_sp < current->sas_ss_size;
#else
	return sp > current->sas_ss_sp &&
		sp - current->sas_ss_sp <= current->sas_ss_size;
#endif
L
Linus Torvalds 已提交
2821 2822 2823 2824
}

static inline int sas_ss_flags(unsigned long sp)
{
2825 2826 2827 2828
	if (!current->sas_ss_size)
		return SS_DISABLE;

	return on_sig_stack(sp) ? SS_ONSTACK : 0;
L
Linus Torvalds 已提交
2829 2830
}

2831 2832 2833 2834 2835 2836 2837
static inline void sas_ss_reset(struct task_struct *p)
{
	p->sas_ss_sp = 0;
	p->sas_ss_size = 0;
	p->sas_ss_flags = SS_DISABLE;
}

A
Al Viro 已提交
2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848
static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)
{
	if (unlikely((ksig->ka.sa.sa_flags & SA_ONSTACK)) && ! sas_ss_flags(sp))
#ifdef CONFIG_STACK_GROWSUP
		return current->sas_ss_sp;
#else
		return current->sas_ss_sp + current->sas_ss_size;
#endif
	return sp;
}

L
Linus Torvalds 已提交
2849 2850 2851 2852 2853 2854
/*
 * Routines for handling mm_structs
 */
extern struct mm_struct * mm_alloc(void);

/* mmdrop drops the mm and the page tables */
2855
extern void __mmdrop(struct mm_struct *);
2856
static inline void mmdrop(struct mm_struct *mm)
L
Linus Torvalds 已提交
2857
{
I
Ingo Molnar 已提交
2858
	if (unlikely(atomic_dec_and_test(&mm->mm_count)))
L
Linus Torvalds 已提交
2859 2860 2861
		__mmdrop(mm);
}

2862 2863 2864 2865 2866
static inline bool mmget_not_zero(struct mm_struct *mm)
{
	return atomic_inc_not_zero(&mm->mm_users);
}

L
Linus Torvalds 已提交
2867 2868
/* mmput gets rid of the mappings and all user-space */
extern void mmput(struct mm_struct *);
M
Michal Hocko 已提交
2869 2870
#ifdef CONFIG_MMU
/* same as above but performs the slow path from the async context. Can
2871 2872 2873
 * be called from the atomic context as well
 */
extern void mmput_async(struct mm_struct *);
M
Michal Hocko 已提交
2874
#endif
2875

L
Linus Torvalds 已提交
2876 2877
/* Grab a reference to a task's mm, if it is not already going away */
extern struct mm_struct *get_task_mm(struct task_struct *task);
2878 2879 2880 2881 2882 2883
/*
 * Grab a reference to a task's mm, if it is not already going away
 * and ptrace_may_access with the mode parameter passed to it
 * succeeds.
 */
extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode);
L
Linus Torvalds 已提交
2884 2885 2886
/* Remove the current tasks stale references to the old mm_struct */
extern void mm_release(struct task_struct *, struct mm_struct *);

2887 2888 2889 2890
#ifdef CONFIG_HAVE_COPY_THREAD_TLS
extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
			struct task_struct *, unsigned long);
#else
A
Alexey Dobriyan 已提交
2891
extern int copy_thread(unsigned long, unsigned long, unsigned long,
2892
			struct task_struct *);
2893 2894 2895 2896 2897 2898 2899 2900 2901 2902

/* Architectures that haven't opted into copy_thread_tls get the tls argument
 * via pt_regs, so ignore the tls argument passed via C. */
static inline int copy_thread_tls(
		unsigned long clone_flags, unsigned long sp, unsigned long arg,
		struct task_struct *p, unsigned long tls)
{
	return copy_thread(clone_flags, sp, arg, p);
}
#endif
L
Linus Torvalds 已提交
2903
extern void flush_thread(void);
J
Jiri Slaby 已提交
2904 2905

#ifdef CONFIG_HAVE_EXIT_THREAD
2906
extern void exit_thread(struct task_struct *tsk);
J
Jiri Slaby 已提交
2907
#else
2908
static inline void exit_thread(struct task_struct *tsk)
J
Jiri Slaby 已提交
2909 2910 2911
{
}
#endif
L
Linus Torvalds 已提交
2912 2913

extern void exit_files(struct task_struct *);
2914
extern void __cleanup_sighand(struct sighand_struct *);
2915

L
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2916
extern void exit_itimers(struct signal_struct *);
2917
extern void flush_itimer_signals(void);
L
Linus Torvalds 已提交
2918

2919
extern void do_group_exit(int);
L
Linus Torvalds 已提交
2920

2921
extern int do_execve(struct filename *,
2922
		     const char __user * const __user *,
2923
		     const char __user * const __user *);
2924 2925 2926 2927
extern int do_execveat(int, struct filename *,
		       const char __user * const __user *,
		       const char __user * const __user *,
		       int);
2928
extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long);
2929
extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
2930
struct task_struct *fork_idle(int);
2931
extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
L
Linus Torvalds 已提交
2932

2933 2934 2935 2936 2937
extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec);
static inline void set_task_comm(struct task_struct *tsk, const char *from)
{
	__set_task_comm(tsk, from, false);
}
2938
extern char *get_task_comm(char *to, struct task_struct *tsk);
L
Linus Torvalds 已提交
2939 2940

#ifdef CONFIG_SMP
2941
void scheduler_ipi(void);
R
Roland McGrath 已提交
2942
extern unsigned long wait_task_inactive(struct task_struct *, long match_state);
L
Linus Torvalds 已提交
2943
#else
2944
static inline void scheduler_ipi(void) { }
R
Roland McGrath 已提交
2945 2946 2947 2948 2949
static inline unsigned long wait_task_inactive(struct task_struct *p,
					       long match_state)
{
	return 1;
}
L
Linus Torvalds 已提交
2950 2951
#endif

2952 2953 2954
#define tasklist_empty() \
	list_empty(&init_task.tasks)

2955 2956
#define next_task(p) \
	list_entry_rcu((p)->tasks.next, struct task_struct, tasks)
L
Linus Torvalds 已提交
2957 2958 2959 2960

#define for_each_process(p) \
	for (p = &init_task ; (p = next_task(p)) != &init_task ; )

2961
extern bool current_is_single_threaded(void);
D
David Howells 已提交
2962

L
Linus Torvalds 已提交
2963 2964 2965 2966 2967 2968 2969 2970 2971 2972
/*
 * Careful: do_each_thread/while_each_thread is a double loop so
 *          'break' will not work as expected - use goto instead.
 */
#define do_each_thread(g, t) \
	for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do

#define while_each_thread(g, t) \
	while ((t = next_thread(t)) != g)

2973 2974 2975 2976 2977 2978 2979 2980 2981 2982
#define __for_each_thread(signal, t)	\
	list_for_each_entry_rcu(t, &(signal)->thread_head, thread_node)

#define for_each_thread(p, t)		\
	__for_each_thread((p)->signal, t)

/* Careful: this is a double loop, 'break' won't work as expected. */
#define for_each_process_thread(p, t)	\
	for_each_process(p) for_each_thread(p, t)

2983 2984
static inline int get_nr_threads(struct task_struct *tsk)
{
2985
	return tsk->signal->nr_threads;
2986 2987
}

2988 2989 2990 2991
static inline bool thread_group_leader(struct task_struct *p)
{
	return p->exit_signal >= 0;
}
L
Linus Torvalds 已提交
2992

2993 2994 2995 2996 2997 2998
/* Do to the insanities of de_thread it is possible for a process
 * to have the pid of the thread group leader without actually being
 * the thread group leader.  For iteration through the pids in proc
 * all we care about is that we have a task with the appropriate
 * pid, we don't actually care if we have the right task.
 */
2999
static inline bool has_group_leader_pid(struct task_struct *p)
3000
{
3001
	return task_pid(p) == p->signal->leader_pid;
3002 3003
}

3004
static inline
3005
bool same_thread_group(struct task_struct *p1, struct task_struct *p2)
3006
{
3007
	return p1->signal == p2->signal;
3008 3009
}

3010
static inline struct task_struct *next_thread(const struct task_struct *p)
O
Oleg Nesterov 已提交
3011
{
3012 3013
	return list_entry_rcu(p->thread_group.next,
			      struct task_struct, thread_group);
O
Oleg Nesterov 已提交
3014 3015
}

A
Alexey Dobriyan 已提交
3016
static inline int thread_group_empty(struct task_struct *p)
L
Linus Torvalds 已提交
3017
{
O
Oleg Nesterov 已提交
3018
	return list_empty(&p->thread_group);
L
Linus Torvalds 已提交
3019 3020 3021 3022 3023 3024
}

#define delay_group_leader(p) \
		(thread_group_leader(p) && !thread_group_empty(p))

/*
3025
 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
3026
 * subscriptions and synchronises with wait4().  Also used in procfs.  Also
3027
 * pins the final release of task.io_context.  Also protects ->cpuset and
O
Oleg Nesterov 已提交
3028
 * ->cgroup.subsys[]. And ->vfork_done.
L
Linus Torvalds 已提交
3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043
 *
 * Nests both inside and outside of read_lock(&tasklist_lock).
 * It must not be nested with write_lock_irq(&tasklist_lock),
 * neither inside nor outside.
 */
static inline void task_lock(struct task_struct *p)
{
	spin_lock(&p->alloc_lock);
}

static inline void task_unlock(struct task_struct *p)
{
	spin_unlock(&p->alloc_lock);
}

3044
extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
3045 3046
							unsigned long *flags);

3047 3048 3049 3050 3051 3052 3053 3054 3055
static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk,
						       unsigned long *flags)
{
	struct sighand_struct *ret;

	ret = __lock_task_sighand(tsk, flags);
	(void)__cond_lock(&tsk->sighand->siglock, ret);
	return ret;
}
3056

3057 3058 3059 3060 3061 3062
static inline void unlock_task_sighand(struct task_struct *tsk,
						unsigned long *flags)
{
	spin_unlock_irqrestore(&tsk->sighand->siglock, *flags);
}

3063
/**
3064 3065
 * threadgroup_change_begin - mark the beginning of changes to a threadgroup
 * @tsk: task causing the changes
3066
 *
3067 3068 3069 3070 3071 3072
 * All operations which modify a threadgroup - a new thread joining the
 * group, death of a member thread (the assertion of PF_EXITING) and
 * exec(2) dethreading the process and replacing the leader - are wrapped
 * by threadgroup_change_{begin|end}().  This is to provide a place which
 * subsystems needing threadgroup stability can hook into for
 * synchronization.
3073
 */
3074
static inline void threadgroup_change_begin(struct task_struct *tsk)
3075
{
3076 3077
	might_sleep();
	cgroup_threadgroup_change_begin(tsk);
3078
}
3079 3080

/**
3081 3082
 * threadgroup_change_end - mark the end of changes to a threadgroup
 * @tsk: task causing the changes
3083
 *
3084
 * See threadgroup_change_begin().
3085
 */
3086
static inline void threadgroup_change_end(struct task_struct *tsk)
3087
{
3088
	cgroup_threadgroup_change_end(tsk);
3089 3090
}

3091 3092 3093 3094 3095 3096
#ifdef CONFIG_THREAD_INFO_IN_TASK

static inline struct thread_info *task_thread_info(struct task_struct *task)
{
	return &task->thread_info;
}
3097 3098 3099 3100 3101 3102

/*
 * When accessing the stack of a non-current task that might exit, use
 * try_get_task_stack() instead.  task_stack_page will return a pointer
 * that could get freed out from under you.
 */
3103 3104 3105 3106
static inline void *task_stack_page(const struct task_struct *task)
{
	return task->stack;
}
3107

3108
#define setup_thread_stack(new,old)	do { } while(0)
3109

3110 3111 3112 3113 3114 3115
static inline unsigned long *end_of_stack(const struct task_struct *task)
{
	return task->stack;
}

#elif !defined(__HAVE_THREAD_FUNCTIONS)
A
Al Viro 已提交
3116

R
Roman Zippel 已提交
3117
#define task_thread_info(task)	((struct thread_info *)(task)->stack)
3118
#define task_stack_page(task)	((void *)(task)->stack)
A
Al Viro 已提交
3119

3120 3121 3122 3123 3124 3125
static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org)
{
	*task_thread_info(p) = *task_thread_info(org);
	task_thread_info(p)->task = p;
}

3126 3127 3128 3129 3130 3131 3132 3133 3134
/*
 * Return the address of the last usable long on the stack.
 *
 * When the stack grows down, this is just above the thread
 * info struct. Going any lower will corrupt the threadinfo.
 *
 * When the stack grows up, this is the highest address.
 * Beyond that position, we corrupt data on the next page.
 */
3135 3136
static inline unsigned long *end_of_stack(struct task_struct *p)
{
3137 3138 3139
#ifdef CONFIG_STACK_GROWSUP
	return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1;
#else
R
Roman Zippel 已提交
3140
	return (unsigned long *)(task_thread_info(p) + 1);
3141
#endif
3142 3143
}

A
Al Viro 已提交
3144
#endif
3145 3146 3147 3148 3149 3150 3151 3152

static inline void *try_get_task_stack(struct task_struct *tsk)
{
	return task_stack_page(tsk);
}

static inline void put_task_stack(struct task_struct *tsk) {}

3153 3154
#define task_stack_end_corrupted(task) \
		(*(end_of_stack(task)) != STACK_END_MAGIC)
A
Al Viro 已提交
3155

3156 3157 3158 3159 3160 3161 3162
static inline int object_is_on_stack(void *obj)
{
	void *stack = task_stack_page(current);

	return (obj >= stack) && (obj < (stack + THREAD_SIZE));
}

3163
extern void thread_stack_cache_init(void);
3164

3165 3166 3167 3168 3169 3170
#ifdef CONFIG_DEBUG_STACK_USAGE
static inline unsigned long stack_not_used(struct task_struct *p)
{
	unsigned long *n = end_of_stack(p);

	do { 	/* Skip over canary */
3171 3172 3173
# ifdef CONFIG_STACK_GROWSUP
		n--;
# else
3174
		n++;
3175
# endif
3176 3177
	} while (!*n);

3178 3179 3180
# ifdef CONFIG_STACK_GROWSUP
	return (unsigned long)end_of_stack(p) - (unsigned long)n;
# else
3181
	return (unsigned long)n - (unsigned long)end_of_stack(p);
3182
# endif
3183 3184
}
#endif
3185
extern void set_task_stack_end_magic(struct task_struct *tsk);
3186

L
Linus Torvalds 已提交
3187 3188 3189 3190 3191
/* set thread flags in other task's structures
 * - see asm/thread_info.h for TIF_xxxx flags available
 */
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
3192
	set_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
3193 3194 3195 3196
}

static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
3197
	clear_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
3198 3199 3200 3201
}

static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
3202
	return test_and_set_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
3203 3204 3205 3206
}

static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
3207
	return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
3208 3209 3210 3211
}

static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag)
{
A
Al Viro 已提交
3212
	return test_ti_thread_flag(task_thread_info(tsk), flag);
L
Linus Torvalds 已提交
3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224
}

static inline void set_tsk_need_resched(struct task_struct *tsk)
{
	set_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
}

static inline void clear_tsk_need_resched(struct task_struct *tsk)
{
	clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED);
}

3225 3226 3227 3228 3229
static inline int test_tsk_need_resched(struct task_struct *tsk)
{
	return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED));
}

3230 3231 3232 3233 3234 3235
static inline int restart_syscall(void)
{
	set_tsk_thread_flag(current, TIF_SIGPENDING);
	return -ERESTARTNOINTR;
}

L
Linus Torvalds 已提交
3236 3237 3238 3239
static inline int signal_pending(struct task_struct *p)
{
	return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING));
}
M
Matthew Wilcox 已提交
3240

3241 3242 3243 3244
static inline int __fatal_signal_pending(struct task_struct *p)
{
	return unlikely(sigismember(&p->pending.signal, SIGKILL));
}
M
Matthew Wilcox 已提交
3245 3246 3247 3248 3249 3250

static inline int fatal_signal_pending(struct task_struct *p)
{
	return signal_pending(p) && __fatal_signal_pending(p);
}

3251 3252 3253 3254 3255 3256 3257 3258 3259 3260
static inline int signal_pending_state(long state, struct task_struct *p)
{
	if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL)))
		return 0;
	if (!signal_pending(p))
		return 0;

	return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
}

L
Linus Torvalds 已提交
3261 3262 3263 3264 3265 3266 3267
/*
 * cond_resched() and cond_resched_lock(): latency reduction via
 * explicit rescheduling in places that are safe. The return
 * value indicates whether a reschedule was done in fact.
 * cond_resched_lock() will drop the spinlock before scheduling,
 * cond_resched_softirq() will enable bhs before scheduling.
 */
3268
extern int _cond_resched(void);
3269

3270
#define cond_resched() ({			\
3271
	___might_sleep(__FILE__, __LINE__, 0);	\
3272 3273
	_cond_resched();			\
})
3274

3275 3276 3277
extern int __cond_resched_lock(spinlock_t *lock);

#define cond_resched_lock(lock) ({				\
3278
	___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\
3279 3280 3281 3282 3283
	__cond_resched_lock(lock);				\
})

extern int __cond_resched_softirq(void);

3284
#define cond_resched_softirq() ({					\
3285
	___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET);	\
3286
	__cond_resched_softirq();					\
3287
})
L
Linus Torvalds 已提交
3288

3289 3290 3291 3292 3293 3294 3295 3296 3297
static inline void cond_resched_rcu(void)
{
#if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
	rcu_read_unlock();
	cond_resched();
	rcu_read_lock();
#endif
}

L
Linus Torvalds 已提交
3298 3299
/*
 * Does a critical section need to be broken due to another
N
Nick Piggin 已提交
3300 3301
 * task waiting?: (technically does not depend on CONFIG_PREEMPT,
 * but a general need for low latency)
L
Linus Torvalds 已提交
3302
 */
N
Nick Piggin 已提交
3303
static inline int spin_needbreak(spinlock_t *lock)
L
Linus Torvalds 已提交
3304
{
N
Nick Piggin 已提交
3305 3306 3307
#ifdef CONFIG_PREEMPT
	return spin_is_contended(lock);
#else
L
Linus Torvalds 已提交
3308
	return 0;
N
Nick Piggin 已提交
3309
#endif
L
Linus Torvalds 已提交
3310 3311
}

3312 3313
/*
 * Idle thread specific functions to determine the need_resched
3314
 * polling state.
3315
 */
3316
#ifdef TIF_POLLING_NRFLAG
3317 3318 3319 3320
static inline int tsk_is_polling(struct task_struct *p)
{
	return test_tsk_thread_flag(p, TIF_POLLING_NRFLAG);
}
3321 3322

static inline void __current_set_polling(void)
3323 3324 3325 3326
{
	set_thread_flag(TIF_POLLING_NRFLAG);
}

3327 3328 3329 3330 3331 3332
static inline bool __must_check current_set_polling_and_test(void)
{
	__current_set_polling();

	/*
	 * Polling state must be visible before we test NEED_RESCHED,
3333
	 * paired by resched_curr()
3334
	 */
3335
	smp_mb__after_atomic();
3336 3337 3338 3339 3340

	return unlikely(tif_need_resched());
}

static inline void __current_clr_polling(void)
3341 3342 3343
{
	clear_thread_flag(TIF_POLLING_NRFLAG);
}
3344 3345 3346 3347 3348 3349 3350

static inline bool __must_check current_clr_polling_and_test(void)
{
	__current_clr_polling();

	/*
	 * Polling state must be visible before we test NEED_RESCHED,
3351
	 * paired by resched_curr()
3352
	 */
3353
	smp_mb__after_atomic();
3354 3355 3356 3357

	return unlikely(tif_need_resched());
}

3358 3359
#else
static inline int tsk_is_polling(struct task_struct *p) { return 0; }
3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370
static inline void __current_set_polling(void) { }
static inline void __current_clr_polling(void) { }

static inline bool __must_check current_set_polling_and_test(void)
{
	return unlikely(tif_need_resched());
}
static inline bool __must_check current_clr_polling_and_test(void)
{
	return unlikely(tif_need_resched());
}
3371 3372
#endif

3373 3374 3375 3376 3377 3378 3379 3380 3381 3382
static inline void current_clr_polling(void)
{
	__current_clr_polling();

	/*
	 * Ensure we check TIF_NEED_RESCHED after we clear the polling bit.
	 * Once the bit is cleared, we'll get IPIs with every new
	 * TIF_NEED_RESCHED and the IPI handler, scheduler_ipi(), will also
	 * fold.
	 */
3383
	smp_mb(); /* paired with resched_curr() */
3384 3385 3386 3387

	preempt_fold_need_resched();
}

3388 3389 3390 3391 3392
static __always_inline bool need_resched(void)
{
	return unlikely(tif_need_resched());
}

3393 3394 3395
/*
 * Thread group CPU time accounting.
 */
3396
void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times);
3397
void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times);
3398

R
Roland McGrath 已提交
3399 3400 3401 3402 3403 3404 3405
/*
 * Reevaluate whether the task has signals pending delivery.
 * Wake the task if so.
 * This is required every time the blocked sigset_t changes.
 * callers must hold sighand->siglock.
 */
extern void recalc_sigpending_and_wake(struct task_struct *t);
L
Linus Torvalds 已提交
3406 3407
extern void recalc_sigpending(void);

3408 3409 3410 3411 3412 3413 3414 3415 3416 3417
extern void signal_wake_up_state(struct task_struct *t, unsigned int state);

static inline void signal_wake_up(struct task_struct *t, bool resume)
{
	signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0);
}
static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume)
{
	signal_wake_up_state(t, resume ? __TASK_TRACED : 0);
}
L
Linus Torvalds 已提交
3418 3419 3420 3421 3422 3423 3424 3425

/*
 * Wrappers for p->thread_info->cpu access. No-op on UP.
 */
#ifdef CONFIG_SMP

static inline unsigned int task_cpu(const struct task_struct *p)
{
3426 3427 3428
#ifdef CONFIG_THREAD_INFO_IN_TASK
	return p->cpu;
#else
A
Al Viro 已提交
3429
	return task_thread_info(p)->cpu;
3430
#endif
L
Linus Torvalds 已提交
3431 3432
}

I
Ingo Molnar 已提交
3433 3434 3435 3436 3437
static inline int task_node(const struct task_struct *p)
{
	return cpu_to_node(task_cpu(p));
}

I
Ingo Molnar 已提交
3438
extern void set_task_cpu(struct task_struct *p, unsigned int cpu);
L
Linus Torvalds 已提交
3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452

#else

static inline unsigned int task_cpu(const struct task_struct *p)
{
	return 0;
}

static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
{
}

#endif /* CONFIG_SMP */

3453 3454
extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask);
extern long sched_getaffinity(pid_t pid, struct cpumask *mask);
3455

D
Dhaval Giani 已提交
3456
#ifdef CONFIG_CGROUP_SCHED
3457
extern struct task_group root_task_group;
P
Peter Zijlstra 已提交
3458
#endif /* CONFIG_CGROUP_SCHED */
3459

3460 3461 3462
extern int task_can_switch_user(struct user_struct *up,
					struct task_struct *tsk);

3463 3464 3465
#ifdef CONFIG_TASK_XACCT
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
{
3466
	tsk->ioac.rchar += amt;
3467 3468 3469 3470
}

static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
{
3471
	tsk->ioac.wchar += amt;
3472 3473 3474 3475
}

static inline void inc_syscr(struct task_struct *tsk)
{
3476
	tsk->ioac.syscr++;
3477 3478 3479 3480
}

static inline void inc_syscw(struct task_struct *tsk)
{
3481
	tsk->ioac.syscw++;
3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500
}
#else
static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
{
}

static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
{
}

static inline void inc_syscr(struct task_struct *tsk)
{
}

static inline void inc_syscw(struct task_struct *tsk)
{
}
#endif

D
Dave Hansen 已提交
3501 3502 3503 3504
#ifndef TASK_SIZE_OF
#define TASK_SIZE_OF(tsk)	TASK_SIZE
#endif

O
Oleg Nesterov 已提交
3505
#ifdef CONFIG_MEMCG
3506 3507 3508 3509 3510
extern void mm_update_next_owner(struct mm_struct *mm);
#else
static inline void mm_update_next_owner(struct mm_struct *mm)
{
}
O
Oleg Nesterov 已提交
3511
#endif /* CONFIG_MEMCG */
3512

3513 3514 3515
static inline unsigned long task_rlimit(const struct task_struct *tsk,
		unsigned int limit)
{
3516
	return READ_ONCE(tsk->signal->rlim[limit].rlim_cur);
3517 3518 3519 3520 3521
}

static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
		unsigned int limit)
{
3522
	return READ_ONCE(tsk->signal->rlim[limit].rlim_max);
3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534
}

static inline unsigned long rlimit(unsigned int limit)
{
	return task_rlimit(current, limit);
}

static inline unsigned long rlimit_max(unsigned int limit)
{
	return task_rlimit_max(current, limit);
}

3535 3536 3537 3538 3539 3540
#ifdef CONFIG_CPU_FREQ
struct update_util_data {
	void (*func)(struct update_util_data *data,
		     u64 time, unsigned long util, unsigned long max);
};

3541 3542 3543 3544
void cpufreq_add_update_util_hook(int cpu, struct update_util_data *data,
			void (*func)(struct update_util_data *data, u64 time,
				     unsigned long util, unsigned long max));
void cpufreq_remove_update_util_hook(int cpu);
3545 3546
#endif /* CONFIG_CPU_FREQ */

L
Linus Torvalds 已提交
3547
#endif