Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Rafael J. Wysocki 8a102eed9c [PATCH] PM: Fix SMP races in the freezer ... Currently, to tell a task that it should go to the refrigerator, we set the PF_FREEZE flag for it and send a fake signal to it. Unfortunately there are two SMP-related problems with this approach. First, a task running on another CPU may be updating its flags while the freezer attempts to set PF_FREEZE for it and this may leave the task's flags in an inconsistent state. Second, there is a potential race between freeze_process() and refrigerator() in which freeze_process() running on one CPU is reading a task's PF_FREEZE flag while refrigerator() running on another CPU has just set PF_FROZEN for the same task and attempts to reset PF_FREEZE for it. If the refrigerator wins the race, freeze_process() will state that PF_FREEZE hasn't been set for the task and will set it unnecessarily, so the task will go to the refrigerator once again after it's been thawed. To solve first of these problems we need to stop using PF_FREEZE to tell tasks that they should go to the refrigerator. Instead, we can introduce a special TIF_*** flag and use it for this purpose, since it is allowed to change the other tasks' TIF_*** flags and there are special calls for it. To avoid the freeze_process()-refrigerator() race we can make freeze_process() to always check the task's PF_FROZEN flag after it's read its "freeze" flag. We should also make sure that refrigerator() will always reset the task's "freeze" flag after it's set PF_FROZEN for it. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Russell King <rmk@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: Andi Kleen <ak@muc.de> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2006-12-13 09:05:49 -08:00
..
irq	[PATCH] CPEI gets warning at kernel/irq/migration.c:27/move_masked_irq()	2006-12-08 08:28:37 -08:00
power	[PATCH] PM: Fix SMP races in the freezer	2006-12-13 09:05:49 -08:00
time	[PATCH] clocksource: small cleanup	2006-12-10 09:57:22 -08:00
.gitignore
acct.c	[PATCH] kernel: change uses of f_{dentry, vfsmnt} to use f_path	2006-12-08 08:28:42 -08:00
audit.c	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
audit.h	[PATCH] audit: AUDIT_PERM support	2006-09-11 13:32:30 -04:00
auditfilter.c	[PATCH] kernel core: replace kmalloc+memset with kzalloc	2006-12-07 08:39:41 -08:00
auditsc.c	[PATCH] struct path: convert kernel	2006-12-08 08:28:46 -08:00
capability.c	[PATCH] pidspace: is_init()	2006-09-29 09:18:12 -07:00
compat.c	[PATCH] Create compat_sys_migrate_pages	2006-11-03 12:27:59 -08:00
configs.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
cpu.c	[PATCH] suspend: don't change cpus_allowed for task initiating the suspend	2006-12-07 08:39:28 -08:00
cpuset.c	[PATCH] cpuset: rework cpuset_zone_allowed api	2006-12-13 09:05:49 -08:00
delayacct.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
dma.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
exec_domain.c
exit.c	[PATCH] fdtable: Remove the free_files field	2006-12-10 09:57:22 -08:00
extable.c
fork.c	[PATCH] fdtable: Remove the free_files field	2006-12-10 09:57:22 -08:00
futex.c	[PATCH] kernel: change uses of f_{dentry, vfsmnt} to use f_path	2006-12-08 08:28:42 -08:00
futex_compat.c	[PATCH] __user annotations: futex	2006-10-10 15:37:22 -07:00
hrtimer.c	[PATCH] posix-timers: Fix clock_nanosleep() doesn't return the remaining time in compatibility mode	2006-09-29 09:18:15 -07:00
itimer.c
kallsyms.c	[PATCH] move kallsyms data to .rodata	2006-12-08 08:28:37 -08:00
Kconfig.hz	[PATCH] HZ: 300Hz support	2006-12-07 08:39:36 -08:00
Kconfig.preempt
kexec.c	Merge branch 'release' of master.kernel.org:/pub/scm/linux/kernel/git/aegl/linux-2.6	2006-12-07 15:39:22 -08:00
kfifo.c	[PATCH] memory ordering in __kfifo primitives	2006-09-29 09:18:13 -07:00
kmod.c	[PATCH] rename struct namespace to struct mnt_namespace	2006-12-08 08:28:51 -08:00
kprobes.c	[PATCH] kprobes: enable booster on the preemptible kernel	2006-12-07 08:39:38 -08:00
ksysfs.c
kthread.c	WorkStruct: Pass the work_struct pointer instead of context data	2006-11-22 14:55:48 +00:00
latency.c	[PATCH] severing module.h->sched.h	2006-12-04 02:00:22 -05:00
lockdep.c	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	2006-12-07 08:59:11 -08:00
lockdep_internals.h	[PATCH] lockdep: more chains	2006-12-07 08:39:43 -08:00
lockdep_proc.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
Makefile	[PATCH] srcu-3: RCU variant permitting read-side blocking	2006-10-04 07:55:30 -07:00
module.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
mutex-debug.c	[PATCH] lockdep: show more details about self-test failures	2006-12-07 08:39:43 -08:00
mutex-debug.h
mutex.c	[PATCH] lockdep: avoid lockdep warning in md	2006-12-08 08:28:39 -08:00
mutex.h
nsproxy.c	[PATCH] Revert "[PATCH] identifier to nsproxy"	2006-12-13 09:05:47 -08:00
panic.c	[PATCH] x86: Clean up x86 NMI sysctls	2006-09-30 01:47:55 +02:00
params.c	[PATCH] module_subsys: initialize earlier	2006-09-29 09:18:08 -07:00
pid.c	[PATCH] add child reaper to pid_namespace	2006-12-08 08:28:52 -08:00
posix-cpu-timers.c	[PATCH] posix-cpu-timers: prevent signal delivery starvation	2006-10-17 08:18:43 -07:00
posix-timers.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
printk.c	[PATCH] add ignore_loglevel boot option	2006-12-07 08:39:47 -08:00
profile.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
ptrace.c	[PATCH] pidspace: is_init()	2006-09-29 09:18:12 -07:00
rcupdate.c	[PATCH] rcu: add a prefetch() in rcu_do_batch()	2006-12-07 08:39:40 -08:00
rcutorture.c	[PATCH] Add Sparse annotations to SRCU wrapper functions in rcutorture	2006-12-07 08:39:44 -08:00
relay.c	[PATCH] kernel: change uses of f_{dentry, vfsmnt} to use f_path	2006-12-08 08:28:42 -08:00
resource.c	[PATCH] struct seq_operations and struct file_operations constification	2006-12-07 08:39:46 -08:00
rtmutex-debug.c	Remove all inclusions of <linux/config.h>	2006-10-04 03:38:54 -04:00
rtmutex-debug.h
rtmutex-tester.c	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
rtmutex.c	[PATCH] clean up and remove some extra spinlocks from rtmutex	2006-09-29 09:18:09 -07:00
rtmutex.h
rtmutex_common.h
rwsem.c
sched.c	[PATCH] kernel/sched.c: whitespace cleanups	2006-12-10 09:57:20 -08:00
seccomp.c
signal.c	[PATCH] PM: Fix freezing of stopped tasks	2006-12-13 09:05:49 -08:00
softirq.c	[PATCH] softirq: remove BUG_ONs which can incorrectly trigger	2006-12-07 08:39:43 -08:00
softlockup.c	[PATCH] check return value of cpu_callback	2006-09-29 09:18:14 -07:00
spinlock.c	[PATCH] lockdep: spin_lock_irqsave_nested()	2006-11-25 13:28:34 -08:00
srcu.c	[PATCH] SRCU: report out-of-memory errors	2006-10-04 07:55:30 -07:00
stacktrace.c
stop_machine.c	[PATCH] stop_machine.c copyright	2006-09-29 09:18:24 -07:00
sys.c	[PATCH] sys_setpgid: eliminate unnecessary do_each_task_pid(PIDTYPE_PGID)	2006-12-08 08:28:52 -08:00
sys_ni.c	[PATCH] Create compat_sys_migrate_pages	2006-11-03 12:27:59 -08:00
sysctl.c	[PATCH] sysctl: remove unused "context" param	2006-12-10 09:55:41 -08:00
taskstats.c	[PATCH] taskstats: cleanup reply assembling	2006-12-07 08:39:34 -08:00
time.c	[PATCH] NTP: Move all the NTP related code to ntp.c	2006-10-01 00:39:26 -07:00
timer.c	[PATCH] clocksource: small cleanup	2006-12-10 09:57:22 -08:00
tsacct.c	[PATCH] io-accounting: via taskstats	2006-12-10 09:55:41 -08:00
uid16.c
unwind.c	[PATCH] unwinder: move .eh_frame to RODATA	2006-12-07 02:14:19 +01:00
user.c	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
utsname.c	[PATCH] namespaces: utsname: implement CLONE_NEWUTS flag	2006-10-02 07:57:22 -07:00
wait.c
workqueue.c	[PATCH] WorkStruct: Use direct assignment rather than cmpxchg()	2006-12-09 12:25:08 -08:00