Peter Zijlstra d72bce0e67 rcu: Cure load woes ... Commit cc3ce5176d (rcu: Start RCU kthreads in TASK_INTERRUPTIBLE state) fudges a sleeping task' state, resulting in the scheduler seeing a TASK_UNINTERRUPTIBLE task going to sleep, but a TASK_INTERRUPTIBLE task waking up. The result is unbalanced load calculation. The problem that patch tried to address is that the RCU threads could stay in UNINTERRUPTIBLE state for quite a while and triggering the hung task detector due to on-demand wake-ups. Cure the problem differently by always giving the tasks at least one wake-up once the CPU is fully up and running, this will kick them out of the initial UNINTERRUPTIBLE state and into the regular INTERRUPTIBLE wait state. [ The alternative would be teaching kthread_create() to start threads as INTERRUPTIBLE but that needs a tad more thought. ] Reported-by: Damien Wyart <damien.wyart@free.fr> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Paul E. McKenney <paul.mckenney@linaro.org> Link: http://lkml.kernel.org/r/1306755291.1200.2872.camel@twins Signed-off-by: Ingo Molnar <mingo@elte.hu>		2011-05-31 10:01:48 +02:00
..
debug	Fix common misspellings	2011-03-31 11:26:23 -03:00
events	perf: Fix SIGIO handling	2011-05-28 17:04:59 +02:00
gcov	Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6	2011-03-20 18:14:55 -07:00
irq	irq: Remove smp_affinity_list when unregister irq proc	2011-05-26 13:15:28 +02:00
power	PM / Hibernate: Update kerneldoc comments in hibernate.c	2011-05-24 23:36:06 +02:00
time	hrtimers: Avoid touching inactive timer bases	2011-05-23 13:59:54 +02:00
trace	ftrace: Add internal recursive checks	2011-05-25 22:13:49 -04:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.locks	arch:Kconfig.locks Remove unused config option.	2011-04-10 17:01:05 +02:00
Kconfig.preempt	…
Makefile	cgroup: remove the ns_cgroup	2011-05-26 17:12:34 -07:00
acct.c	…
async.c	…
audit.c	…
audit.h	…
audit_tree.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
audit_watch.c	…
auditfilter.c	…
auditsc.c	audit: acquire creds selectively to reduce atomic op overhead	2011-04-27 15:11:03 +02:00
backtracetest.c	…
bounds.c	memcg: remove direct page_cgroup-to-page pointer	2011-03-23 19:46:28 -07:00
capability.c	Merge branch 'master' into next	2011-05-19 18:51:57 +10:00
cgroup.c	cgroup: remove the ns_cgroup	2011-05-26 17:12:34 -07:00
cgroup_freezer.c	cgroups: add per-thread subsystem callbacks	2011-05-26 17:12:34 -07:00
compat.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile	2011-05-25 15:35:32 -07:00
configs.c	…
cpu.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
cpuset.c	cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed	2011-05-28 17:02:57 +02:00
crash_dump.c	crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn	2011-03-23 19:47:19 -07:00
cred.c	Merge branch 'docs-move' of git://git.kernel.org/pub/scm/linux/kernel/git/rdunlap/linux-docs	2011-05-27 10:25:02 -07:00
delayacct.c	…
dma.c	…
elfcore.c	…
exec_domain.c	…
exit.c	Merge branch 'ptrace' of git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc	2011-05-20 13:33:21 -07:00
extable.c	extable, core_kernel_data(): Make sure all archs define _sdata	2011-05-20 08:56:56 +02:00
fork.c	mm: Fix boot crash in mm_alloc()	2011-05-29 11:32:28 -07:00
freezer.c	Freezer: Use SMP barriers	2011-05-17 23:19:17 +02:00
futex.c	futex: Set FLAGS_HAS_TIMEOUT during futex_wait restart setup	2011-04-15 16:34:32 +02:00
futex_compat.c	userns: user namespaces: convert several capable() calls	2011-03-23 19:47:08 -07:00
groups.c	userns: user namespaces: convert several capable() calls	2011-03-23 19:47:08 -07:00
hrtimer.c	hrtimers: Fix typo causing erratic timers	2011-05-25 15:31:58 -07:00
hung_task.c	watchdog, hung_task_timeout: Add Kconfig configurable default	2011-04-28 09:13:17 +02:00
irq_work.c	…
itimer.c	…
jump_label.c	jump_label: Check entries limit in __jump_label_update	2011-05-25 19:56:36 -04:00
kallsyms.c	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2011-03-25 17:52:22 -07:00
kexec.c	PM: Remove sysdev suspend, resume and shutdown operations	2011-05-11 21:37:15 +02:00
kfifo.c	…
kmod.c	Merge branch 'next' into for-linus	2011-05-24 22:55:24 +10:00
kprobes.c	…
ksysfs.c	kernel/ksysfs.c: expose file_caps_enabled in sysfs	2011-04-19 16:45:51 -07:00
kthread.c	cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed	2011-05-28 17:02:57 +02:00
latencytop.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
lockdep.c	lockdep: Remove cmpxchg to update nr_chain_hlocks	2011-04-22 11:06:59 +02:00
lockdep_internals.h	…
lockdep_proc.c	lockdep: Remove unused 'factor' variable from lockdep_stats_show()	2011-03-23 13:54:47 +01:00
lockdep_states.h	…
module.c	Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6	2011-05-23 12:49:28 -07:00
mutex-debug.c	mutex: Use p->on_cpu for the adaptive spin	2011-04-14 08:52:33 +02:00
mutex-debug.h	mutex: Use p->on_cpu for the adaptive spin	2011-04-14 08:52:33 +02:00
mutex.c	lockdep, mutex: provide mutex_lock_nest_lock	2011-05-25 08:39:17 -07:00
mutex.h	mutex: Use p->on_cpu for the adaptive spin	2011-04-14 08:52:33 +02:00
notifier.c	…
nsproxy.c	cgroup: remove the ns_cgroup	2011-05-26 17:12:34 -07:00
padata.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
panic.c	move x86 specific oops=panic to generic code	2011-03-22 17:44:11 -07:00
params.c	params.c: Use new strtobool function to process boolean inputs	2011-05-19 16:55:28 +09:30
pid.c	next_pidmap: fix overflow condition	2011-04-18 10:35:30 -07:00
pid_namespace.c	pidns: call pid_ns_prepare_proc() from create_pid_namespace()	2011-03-23 19:46:58 -07:00
pm_qos_params.c	Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6	2011-05-29 11:18:09 -07:00
posix-cpu-timers.c	hrtimers: Avoid touching inactive timer bases	2011-05-23 13:59:54 +02:00
posix-timers.c	posix-timers: RCU conversion	2011-05-24 12:10:51 +02:00
printk.c	printk: allocate kernel log buffer earlier	2011-05-25 08:39:48 -07:00
profile.c	kernel/profile.c: remove some duplicate code from profile_hits()	2011-05-26 17:12:37 -07:00
ptrace.c	ptrace: ptrace_resume() shouldn't wake up !TASK_TRACED thread	2011-05-25 19:20:21 +02:00
range.c	…
rcupdate.c	rcu: Use WARN_ON_ONCE for DEBUG_OBJECTS_RCU_HEAD warnings	2011-05-05 23:16:57 -07:00
rcutiny.c	sanitize <linux/prefetch.h> usage	2011-05-20 12:50:29 -07:00
rcutiny_plugin.h	rcu: Converge TINY_RCU expedited and normal boosting	2011-05-05 23:16:58 -07:00
rcutorture.c	rcu: mark rcutorture boosting callback as being on-stack	2011-05-05 23:16:57 -07:00
rcutree.c	rcu: Cure load woes	2011-05-31 10:01:48 +02:00
rcutree.h	rcu: Remove waitqueue usage for cpu, node, and boost kthreads	2011-05-28 17:41:52 +02:00
rcutree_plugin.h	rcu: Cure load woes	2011-05-31 10:01:48 +02:00
rcutree_trace.c	rcu: Decrease memory-barrier usage based on semi-formal proof	2011-05-26 09:42:23 -07:00
relay.c	…
res_counter.c	memcg: res_counter_read_u64(): fix potential races on 32-bit machines	2011-03-23 19:46:22 -07:00
resource.c	…
rtmutex-debug.c	…
rtmutex-debug.h	…
rtmutex-tester.c	…
rtmutex.c	…
rtmutex.h	…
rtmutex_common.h	…
rwsem.c	…
sched.c	cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed	2011-05-28 17:02:57 +02:00
sched_autogroup.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
sched_autogroup.h	…
sched_clock.c	…
sched_cpupri.c	…
sched_cpupri.h	…
sched_debug.c	sched: Get rid of lock_depth	2011-04-24 13:18:38 +02:00
sched_fair.c	sched: Fix ->min_vruntime calculation in dequeue_entity()	2011-05-28 17:02:56 +02:00
sched_features.h	sched: Move the second half of ttwu() to the remote cpu	2011-04-14 08:52:41 +02:00
sched_idletask.c	sched: Drop the rq argument to sched_class::select_task_rq()	2011-04-14 08:52:36 +02:00
sched_rt.c	sched: More sched_domain iterations fixes	2011-05-28 17:02:54 +02:00
sched_stats.h	sched: More sched_domain iterations fixes	2011-05-28 17:02:54 +02:00
sched_stoptask.c	sched: Drop the rq argument to sched_class::select_task_rq()	2011-04-14 08:52:36 +02:00
seccomp.c	…
semaphore.c	…
signal.c	signal: sys_pause() should check signal_pending()	2011-05-25 19:22:27 +02:00
smp.c	smp: move smp setup functions to kernel/smp.c	2011-03-22 17:44:11 -07:00
softirq.c	rcu: move TREE_RCU from softirq to kthread	2011-05-05 23:16:54 -07:00
spinlock.c	…
srcu.c	…
stacktrace.c	…
stop_machine.c	kthread: use kthread_create_on_node()	2011-03-22 17:44:01 -07:00
sys.c	Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6	2011-05-19 18:24:11 -07:00
sys_ni.c	ipc: Add missing sys_ni entries for ipc/compat.c functions	2011-05-20 13:53:02 -07:00
sysctl.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile	2011-05-25 15:35:32 -07:00
sysctl_binary.c	…
sysctl_check.c	sysctl_check: drop dead code	2011-03-23 19:46:51 -07:00
taskstats.c	taskstats: use appropriate printk priority level	2011-03-23 19:47:14 -07:00
test_kprobes.c	…
time.c	…
timeconst.pl	…
timer.c	…
tracepoint.c	jump label: Introduce static_branch() interface	2011-04-04 12:48:08 -04:00
tsacct.c	…
uid16.c	userns: user namespaces: convert several capable() calls	2011-03-23 19:47:08 -07:00
up.c	…
user-return-notifier.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
user.c	userns: add a user_namespace as creator/owner of uts_namespace	2011-03-23 19:46:59 -07:00
user_namespace.c	…
utsname.c	ns proc: Add support for the uts namespace	2011-05-10 14:35:35 -07:00
utsname_sysctl.c	…
wait.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
watchdog.c	kernel/watchdog.c: Use proper ANSI C prototypes	2011-05-23 21:07:40 -07:00
workqueue.c	Merge branch 'for-2.6.40' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2011-05-24 11:53:42 -07:00
workqueue_sched.h	…