• M
    container freezer: add TIF_FREEZE flag to all architectures · 83224b08
    Matt Helsley 提交于
    This patch series introduces a cgroup subsystem that utilizes the swsusp
    freezer to freeze a group of tasks.  It's immediately useful for batch job
    management scripts.  It should also be useful in the future for
    implementing container checkpoint/restart.
    
    The freezer subsystem in the container filesystem defines a cgroup file
    named freezer.state.  Reading freezer.state will return the current state
    of the cgroup.  Writing "FROZEN" to the state file will freeze all tasks
    in the cgroup.  Subsequently writing "RUNNING" will unfreeze the tasks in
    the cgroup.
    
    * Examples of usage :
    
       # mkdir /containers/freezer
       # mount -t cgroup -ofreezer freezer  /containers
       # mkdir /containers/0
       # echo $some_pid > /containers/0/tasks
    
    to get status of the freezer subsystem :
    
       # cat /containers/0/freezer.state
       RUNNING
    
    to freeze all tasks in the container :
    
       # echo FROZEN > /containers/0/freezer.state
       # cat /containers/0/freezer.state
       FREEZING
       # cat /containers/0/freezer.state
       FROZEN
    
    to unfreeze all tasks in the container :
    
       # echo RUNNING > /containers/0/freezer.state
       # cat /containers/0/freezer.state
       RUNNING
    
    This patch:
    
    The first step in making the refrigerator() available to all
    architectures, even for those without power management.
    
    The purpose of such a change is to be able to use the refrigerator() in a
    new control group subsystem which will implement a control group freezer.
    
    [akpm@linux-foundation.org: fix sparc]
    Signed-off-by: NCedric Le Goater <clg@fr.ibm.com>
    Signed-off-by: NMatt Helsley <matthltc@us.ibm.com>
    Acked-by: NPavel Machek <pavel@suse.cz>
    Acked-by: NSerge E. Hallyn <serue@us.ibm.com>
    Acked-by: NRafael J. Wysocki <rjw@sisk.pl>
    Acked-by: NNigel Cunningham <nigel@tuxonice.net>
    Tested-by: NMatt Helsley <matthltc@us.ibm.com>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    83224b08
thread_info.h 3.7 KB
/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_AVR32_THREAD_INFO_H
#define __ASM_AVR32_THREAD_INFO_H

#include <asm/page.h>

#define THREAD_SIZE_ORDER	1
#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)

#ifndef __ASSEMBLY__
#include <asm/types.h>

struct task_struct;
struct exec_domain;

struct thread_info {
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	unsigned long		flags;		/* low level flags */
	__u32			cpu;
	__s32			preempt_count;	/* 0 => preemptable, <0 => BUG */
	__u32			rar_saved;	/* return address... */
	__u32			rsr_saved;	/* ...and status register
						   saved by debug handler
						   when setting up
						   trampoline */
	struct restart_block	restart_block;
	__u8			supervisor_stack[0];
};

#define INIT_THREAD_INFO(tsk)						\
{									\
	.task		= &tsk,						\
	.exec_domain	= &default_exec_domain,				\
	.flags		= 0,						\
	.cpu		= 0,						\
	.preempt_count	= 1,						\
	.restart_block	= {						\
		.fn	= do_no_restart_syscall				\
	}								\
}

#define init_thread_info	(init_thread_union.thread_info)
#define init_stack		(init_thread_union.stack)

/*
 * Get the thread information struct from C.
 * We do the usual trick and use the lower end of the stack for this
 */
static inline struct thread_info *current_thread_info(void)
{
	unsigned long addr = ~(THREAD_SIZE - 1);

	asm("and %0, sp" : "=r"(addr) : "0"(addr));
	return (struct thread_info *)addr;
}

#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)

#endif /* !__ASSEMBLY__ */

#define PREEMPT_ACTIVE		0x40000000

/*
 * Thread information flags
 * - these are process state flags that various assembly files may need to access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
#define TIF_SIGPENDING          1       /* signal pending */
#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
#define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
					   TIF_NEED_RESCHED */
#define TIF_BREAKPOINT		4	/* enter monitor mode on return */
#define TIF_SINGLE_STEP		5	/* single step in progress */
#define TIF_MEMDIE		6
#define TIF_RESTORE_SIGMASK	7	/* restore signal mask in do_signal */
#define TIF_CPU_GOING_TO_SLEEP	8	/* CPU is entering sleep 0 mode */
#define TIF_FREEZE		29
#define TIF_DEBUG		30	/* debugging enabled */
#define TIF_USERSPACE		31      /* true if FS sets userspace */

#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
#define _TIF_SINGLE_STEP	(1 << TIF_SINGLE_STEP)
#define _TIF_MEMDIE		(1 << TIF_MEMDIE)
#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
#define _TIF_FREEZE		(1 << TIF_FREEZE)

/* Note: The masks below must never span more than 16 bits! */

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK				\
	((1 << TIF_SIGPENDING)			\
	 | (1 << TIF_NEED_RESCHED)		\
	 | (1 << TIF_POLLING_NRFLAG)		\
	 | (1 << TIF_BREAKPOINT)		\
	 | (1 << TIF_RESTORE_SIGMASK))

/* work to do on any return to userspace */
#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK | (1 << TIF_SYSCALL_TRACE))
/* work to do on return from debug mode */
#define _TIF_DBGWORK_MASK	(_TIF_WORK_MASK & ~(1 << TIF_BREAKPOINT))

#endif /* __ASM_AVR32_THREAD_INFO_H */
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