- 20 4月, 2008 13 次提交
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由 Peter Zijlstra 提交于
Various SMP balancing algorithms require that the bandwidth period run in sync. Possible improvements are moving the rt_bandwidth thing into root_domain and keeping a span per rt_bandwidth which marks throttled cpus. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Peter Zijlstra 提交于
Balbir Singh reported: > 1:mon> t > [c0000000e7677da0] c000000000067de0 .sys_sched_yield+0x6c/0xbc > [c0000000e7677e30] c000000000008748 syscall_exit+0x0/0x40 > --- Exception: c01 (System Call) at 00000400001d09e4 > SP (4000664cb10) is in userspace > 1:mon> r > cpu 0x1: Vector: 300 (Data Access) at [c0000000e7677aa0] > pc: c000000000068e50: .yield_task_fair+0x94/0xc4 > lr: c000000000067de0: .sys_sched_yield+0x6c/0xbc the check that should have avoided that is: /* * Are we the only task in the tree? */ if (unlikely(rq->load.weight == curr->se.load.weight)) return; But I guess that overlooks rt tasks, they also increase the load. So I guess something like this ought to fix it.. Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Dmitry Adamushko 提交于
There is no need to loop any longer when 'same == 0'. Signed-off-by: NDmitry Adamushko <dmitry.adamushko@gmail.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Ingo Molnar 提交于
it's unused. Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Ingo Molnar 提交于
Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Ingo Molnar 提交于
Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Ingo Molnar 提交于
Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Ingo Molnar 提交于
turn off sync wakeups by default. They are not needed anymore - the buddy logic should be smart enough to keep the system from overscheduling. Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Peter Zijlstra 提交于
The wakeup buddy logic didn't use the same wakeup granularity logic as the wakeup preemption did, this might cause the ->next buddy to be selected past the point where we would have preempted had the task been a single running instance. Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Guillaume Chazarain 提交于
When using CONFIG_NO_HZ, rq->tick_timestamp is not updated every TICK_NSEC. We check that the number of skipped ticks matches the clock jump seen in __update_rq_clock(). Signed-off-by: NGuillaume Chazarain <guichaz@yahoo.fr> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Reynes Philippe 提交于
kernel/sched.c:506: erreur: implicit declaration of function tick_get_tick_sched kernel/sched.c:506: erreur: invalid type argument of -> kernel/sched.c:506: erreur: NOHZ_MODE_INACTIVE undeclared (first use in this function) kernel/sched.c:506: erreur: (Each undeclared identifier is reported only once kernel/sched.c:506: erreur: for each function it appears in.) Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Ingo Molnar 提交于
Alexey Zaytsev reported (and bisected) that the introduction of cpu_clock() in printk made the timestamps jump back and forth. Make cpu_clock() more reliable while still keeping it fast when it's called frequently. Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Ingo Molnar 提交于
re-apply: | commit e22ecef1 | Author: Ingo Molnar <mingo@elte.hu> | Date: Fri Mar 14 22:16:08 2008 +0100 | | sched: fix fair sleepers | | Fair sleepers need to scale their latency target down by runqueue | weight. Otherwise busy systems will gain ever larger sleep bonus. Signed-off-by: NIngo Molnar <mingo@elte.hu>
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- 19 4月, 2008 4 次提交
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由 Ahmed S. Darwish 提交于
Rename the se_str and se_rule audit fields elements to lsm_str and lsm_rule to avoid confusion. Signed-off-by: NCasey Schaufler <casey@schaufler-ca.com> Signed-off-by: NAhmed S. Darwish <darwish.07@gmail.com> Acked-by: NJames Morris <jmorris@namei.org>
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由 Ahmed S. Darwish 提交于
Setup the new Audit LSM hooks for SELinux. Remove the now redundant exported SELinux Audit interface. Audit: Export 'audit_krule' and 'audit_field' to the public since their internals are needed by the implementation of the new LSM hook 'audit_rule_known'. Signed-off-by: NCasey Schaufler <casey@schaufler-ca.com> Signed-off-by: NAhmed S. Darwish <darwish.07@gmail.com> Acked-by: NJames Morris <jmorris@namei.org>
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由 Ahmed S. Darwish 提交于
Convert Audit to use the new LSM Audit hooks instead of the exported SELinux interface. Basically, use: security_audit_rule_init secuirty_audit_rule_free security_audit_rule_known security_audit_rule_match instad of (respectively) : selinux_audit_rule_init selinux_audit_rule_free audit_rule_has_selinux selinux_audit_rule_match Signed-off-by: NCasey Schaufler <casey@schaufler-ca.com> Signed-off-by: NAhmed S. Darwish <darwish.07@gmail.com> Acked-by: NJames Morris <jmorris@namei.org>
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由 Ahmed S. Darwish 提交于
Stop using the following exported SELinux interfaces: selinux_get_inode_sid(inode, sid) selinux_get_ipc_sid(ipcp, sid) selinux_get_task_sid(tsk, sid) selinux_sid_to_string(sid, ctx, len) kfree(ctx) and use following generic LSM equivalents respectively: security_inode_getsecid(inode, secid) security_ipc_getsecid*(ipcp, secid) security_task_getsecid(tsk, secid) security_sid_to_secctx(sid, ctx, len) security_release_secctx(ctx, len) Call security_release_secctx only if security_secid_to_secctx succeeded. Signed-off-by: NCasey Schaufler <casey@schaufler-ca.com> Signed-off-by: NAhmed S. Darwish <darwish.07@gmail.com> Acked-by: NJames Morris <jmorris@namei.org> Reviewed-by: NPaul Moore <paul.moore@hp.com>
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- 18 4月, 2008 10 次提交
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由 Roland McGrath 提交于
This breaks out the ptrace handling from get_signal_to_deliver into a new subroutine. The actual code there doesn't change, and it gets inlined into nearly identical compiled code. This makes the function substantially shorter and thus easier to read, and it nicely isolates the ptrace magic. Signed-off-by: NRoland McGrath <roland@redhat.com> Acked-by: NKyle McMartin <kyle@mcmartin.ca> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Li Zefan 提交于
When I ran a test program to fork mass processes and at the same time 'cat /cgroup/tasks', I got the following oops: ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:72! invalid opcode: 0000 [#1] SMP Pid: 4178, comm: a.out Not tainted (2.6.25-rc9 #72) ... Call Trace: [<c044a5f9>] ? cgroup_exit+0x55/0x94 [<c0427acf>] ? do_exit+0x217/0x5ba [<c0427ed7>] ? do_group_exit+0.65/0x7c [<c0427efd>] ? sys_exit_group+0xf/0x11 [<c0404842>] ? syscall_call+0x7/0xb [<c05e0000>] ? init_cyrix+0x2fa/0x479 ... EIP: [<c04df671>] list_del+0x35/0x53 SS:ESP 0068:ebc7df4 ---[ end trace caffb7332252612b ]--- Fixing recursive fault but reboot is needed! After digging into the code and debugging, I finlly found out a race situation: do_exit() ->cgroup_exit() ->if (!list_empty(&tsk->cg_list)) list_del(&tsk->cg_list); cgroup_iter_start() ->cgroup_enable_task_cg_list() ->list_add(&tsk->cg_list, ..); In this case the list won't be deleted though the process has exited. We got two bug reports in the past, which seem to be the same bug as this one: http://lkml.org/lkml/2008/3/5/332 http://lkml.org/lkml/2007/10/17/224 Actually sometimes I got oops on list_del, sometimes oops on list_add. And I can change my test program a bit to trigger other oops. The patch has been tested both on x86_32 and x86_64. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Acked-by: NPaul Menage <menage@google.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: stable@kernel.org Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Jason Wessel 提交于
On the ppc 4xx architecture the instruction cache must be flushed as well as the data cache. This patch just makes it generic for all architectures where CACHE_FLUSH_IS_SAFE is set to 1. Signed-off-by: NJason Wessel <jason.wessel@windriver.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Jason Wessel 提交于
Fix the problem of protecting the kgdb handle_exception exit which had an NMI race condition, while trying to restore normal system operation. There was a small window after the master processor sets cpu_in_debug to zero but before it has set kgdb_active to zero where a non-master processor in an SMP system could receive an NMI and re-enter the kgdb_wait() loop. As long as the master processor sets the cpu_in_debug before sending the cpu roundup the cpu_in_debug variable can also be used to guard against the race condition. The kgdb_wait() function no longer needs to check kgdb_active because it is done in the arch specific code and handled along with the nmi traps at the low level. This also allows kgdb_wait() to exit correctly if it was entered for some unknown reason due to a spurious NMI that could not be handled by the arch specific code. Signed-off-by: NJason Wessel <jason.wessel@windriver.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Jason Wessel 提交于
kgdb core fixes: - Check to see that mm->mmap_cache is not null before calling flush_cache_range(), else on arch=ARM it will cause a fatal fault. - Breakpoints should only be restored if they are in the BP_ACTIVE state. - Fix a typo in comments to "kgdb_register_io_module" x86 kgdb fixes: - Fix the x86 arch handler such that on a kill or detach that the appropriate cleanup on the single stepping flags gets run. - Add in the DIE_NMIWATCHDOG call for x86_64 - Touch the nmi watchdog before returning the system to normal operation after performing any kind of kgdb operation, else the possibility exists to trigger the watchdog. Signed-off-by: NJason Wessel <jason.wessel@windriver.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Jason Wessel 提交于
Fix two regressions dealing with the kgdb core. 1) kgdb_skipexception and kgdb_post_primary_code are optional functions that are only required on archs that need special exception fixups. 2) The kernel address space scope must be set on any probe_kernel_* function or archs such as ARCH=arm will not allow access to the kernel memory space. As an example, it is required to allow the full kernel address space is when you the kernel debugger to inspect a system call. Signed-off-by: NJason Wessel <jason.wessel@windriver.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Jason Wessel 提交于
Add HW breakpoints into the arch specific portion of x86 kgdb. In the current x86 kernel.org kernels HW breakpoints are changed out in lazy fashion because there is no infrastructure around changing them when changing to a kernel task or entering the kernel mode via a system call. This lazy approach means that if a user process uses HW breakpoints the kgdb will loose out. This is an acceptable trade off because the developer debugging the kernel is assumed to know what is going on system wide and would be aware of this trade off. There is a minor bug fix to the kgdb core so as to correctly call the hw breakpoint functions with a valid value from the enum. There is also a minor change to the x86_64 startup code when using early HW breakpoints. When the debugger is connected, the cpu startup code must not zero out the HW breakpoint registers or you cannot hit the breakpoints you are interested in, in the first place. Signed-off-by: NJason Wessel <jason.wessel@windriver.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Jason Wessel 提交于
If kgdb does remove a breakpoint that had a problem on the recursion check, it should also print the address of the breakpoint. Signed-off-by: NJason Wessel <jason.wessel@windriver.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Jason Wessel 提交于
In order to not trip the clocksource watchdog, kgdb must touch the clocksource watchdog on the return to normal system run state. Signed-off-by: NJason Wessel <jason.wessel@windriver.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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由 Jason Wessel 提交于
kgdb core code. Handles the protocol and the arch details. [ mingo@elte.hu: heavily modified, simplified and cleaned up. ] [ xemul@openvz.org: use find_task_by_pid_ns ] Signed-off-by: NJason Wessel <jason.wessel@windriver.com> Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NJan Kiszka <jan.kiszka@web.de> Reviewed-by: NThomas Gleixner <tglx@linutronix.de>
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- 17 4月, 2008 13 次提交
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由 Matthew Wilcox 提交于
Move documentation from semaphore.h to semaphore.c as requested by Andrew Morton. Also reformat to kernel-doc style and add some more notes about the implementation. Signed-off-by: NMatthew Wilcox <willy@linux.intel.com>
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由 Matthew Wilcox 提交于
By removing the negative values of 'count' and relying on the wait_list to indicate whether we have any waiters, we can simplify the implementation by removing the protection against an unlikely race condition. Thanks to David Howells for his suggestions. Signed-off-by: NMatthew Wilcox <willy@linux.intel.com>
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由 Matthew Wilcox 提交于
ACPI currently emulates a timeout for semaphores with calls to down_trylock and sleep. This produces horrible behaviour in terms of fairness and excessive wakeups. Now that we have a unified semaphore implementation, adding a real down_trylock is almost trivial. Signed-off-by: NMatthew Wilcox <willy@linux.intel.com>
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由 Matthew Wilcox 提交于
down_killable() is the functional counterpart of mutex_lock_killable. Signed-off-by: NMatthew Wilcox <willy@linux.intel.com>
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由 Matthew Wilcox 提交于
Semaphores are no longer performance-critical, so a generic C implementation is better for maintainability, debuggability and extensibility. Thanks to Peter Zijlstra for fixing the lockdep warning. Thanks to Harvey Harrison for pointing out that the unlikely() was unnecessary. Signed-off-by: NMatthew Wilcox <willy@linux.intel.com> Acked-by: NIngo Molnar <mingo@elte.hu>
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由 Andi Kleen 提交于
This way it checks if the clocks are synchronized between CPUs too. This might be able to detect slowly drifting TSCs which only go wrong over longer time. Signed-off-by: NAndi Kleen <ak@suse.de> Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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由 Karsten Wiese 提交于
Call ts = &per_cpu(tick_cpu_sched, cpu); and cpu = smp_processor_id(); once instead of twice. No functional change done, as changed code runs with local irq off. Reduces source lines and text size (20bytes on x86_64). [ akpm@linux-foundation.org: Build fix ] Signed-off-by: NKarsten Wiese <fzu@wemgehoertderstaat.de> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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由 Oleg Nesterov 提交于
In order to avoid the false positive from lockdep, each per-cpu base->lock has the separate lock class and migrate_hrtimers() uses double_spin_lock(). This is overcomplicated: except for migrate_hrtimers() we never take 2 locks at once, and migrate_hrtimers() can use spin_lock_nested(). Signed-off-by: NOleg Nesterov <oleg@tv-sign.ru> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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由 Oleg Nesterov 提交于
In order to avoid the false positive from lockdep, each per-cpu base->lock has the separate lock class and migrate_timers() uses double_spin_lock(). This all is overcomplicated: except for migrate_timers() we never take 2 locks at once, and migrate_timers() can use spin_lock_nested(). Signed-off-by: NOleg Nesterov <oleg@tv-sign.ru> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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由 WANG Cong 提交于
Fix sparse warnings like this: kernel/posix-cpu-timers.c:1090:25: warning: symbol 't' shadows an earlier one kernel/posix-cpu-timers.c:1058:21: originally declared here Signed-off-by: NWANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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由 Pavel Machek 提交于
Add timer list annotations to workqueue.c so we can see the call site in the timer stats. Signed-off-by: NPavel Machek <Pavel@suse.cz> Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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由 Thomas Gleixner 提交于
Convert all the nanosleep related users of restart_block to the new nanosleep specific restart_block fields. Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
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由 Russell King 提交于
> Generic code is not supposed to include irq.h. Replace this include > by linux/hardirq.h instead and add/replace an include of linux/irq.h > in asm header files where necessary. > This change should only matter for architectures that make use of > GENERIC_CLOCKEVENTS. > Architectures in question are mips, x86, arm, sh, powerpc, uml and sparc64. > > I did some cross compile tests for mips, x86_64, arm, powerpc and sparc64. > This patch fixes also build breakages caused by the include replacement in > tick-common.h. I generally dislike adding optional linux/* includes in asm/* includes - I'm nervous about this causing include loops. However, there's a separate point to be discussed here. That is, what interfaces are expected of every architecture in the kernel. If generic code wants to be able to set the affinity of interrupts, then that needs to become part of the interfaces listed in linux/interrupt.h rather than linux/irq.h. So what I suggest is this approach instead (against Linus' tree of a couple of days ago) - we move irq_set_affinity() and irq_can_set_affinity() to linux/interrupt.h, change the linux/irq.h includes to linux/interrupt.h and include asm/irq_regs.h where needed (asm/irq_regs.h is supposed to be rarely used include since not much touches the stacked parent context registers.) Build tested on ARM PXA family kernels and ARM's Realview platform kernels which both use genirq. [ tglx@linutronix.de: add GENERIC_HARDIRQ dependencies ] Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
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