Peter Zijlstra d72bce0e67 rcu: Cure load woes ...

Commit cc3ce5176d83 (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

…

acct.c

pass a struct path to vfs_statfs

2010-08-09 16:48:42 -04:00

async.c

async: use workqueue for worker pool

2010-07-14 11:29:46 +02:00

audit_tree.c

Fix common misspellings

2011-03-31 11:26:23 -03:00

audit_watch.c

kill path_lookup()

2011-03-14 09:15:23 -04:00

audit.c

netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms

2011-03-03 10:55:40 -08:00

audit.h

audit: make functions static

2010-10-30 01:42:19 -04:00

auditfilter.c

netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms

2011-03-03 10:55:40 -08:00

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_freezer.c

cgroups: add per-thread subsystem callbacks

2011-05-26 17:12:34 -07:00

cgroup.c

cgroup: remove the ns_cgroup

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

llseek: automatically add .llseek fop

2010-10-15 15:53:27 +02:00

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

sys_personality: remove the bogus checks in sys_personality()->__set_personality() path

2010-08-09 20:45:05 -07:00

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_compat.c

userns: user namespaces: convert several capable() calls

2011-03-23 19:47:08 -07:00

futex.c

futex: Set FLAGS_HAS_TIMEOUT during futex_wait restart setup

2011-04-15 16:34:32 +02:00

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

irq_work: Use per cpu atomics instead of regular atomics

2010-12-18 15:54:48 +01:00

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

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.locks

arch:Kconfig.locks Remove unused config option.

2011-04-10 17:01:05 +02:00

Kconfig.preempt

…

kexec.c

PM: Remove sysdev suspend, resume and shutdown operations

2011-05-11 21:37:15 +02:00

kfifo.c

kfifo: fix scatterlist usage

2010-10-01 10:50:58 -07:00

kmod.c

Merge branch 'next' into for-linus

2011-05-24 22:55:24 +10:00

kprobes.c

Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

2011-01-07 17:02:58 -08:00

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_internals.h

lockdep: No need to disable preemption in debug atomic ops

2010-05-04 05:38:16 +02:00

lockdep_proc.c

lockdep: Remove unused 'factor' variable from lockdep_stats_show()

2011-03-23 13:54:47 +01:00

lockdep_states.h

…

lockdep.c

lockdep: Remove cmpxchg to update nr_chain_hlocks

2011-04-22 11:06:59 +02:00

Makefile

cgroup: remove the ns_cgroup

2011-05-26 17:12:34 -07:00

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_namespace.c

pidns: call pid_ns_prepare_proc() from create_pid_namespace()

2011-03-23 19:46:58 -07:00

pid.c

next_pidmap: fix overflow condition

2011-04-18 10:35:30 -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

kernel/range.c: fix clean_sort_range() for the case of full array

2010-11-12 07:55:31 -08:00

rcupdate.c

rcu: Use WARN_ON_ONCE for DEBUG_OBJECTS_RCU_HEAD warnings

2011-05-05 23:16:57 -07:00

rcutiny_plugin.h

rcu: Converge TINY_RCU expedited and normal boosting

2011-05-05 23:16:58 -07:00

rcutiny.c

sanitize <linux/prefetch.h> usage

2011-05-20 12:50:29 -07:00

rcutorture.c

rcu: mark rcutorture boosting callback as being on-stack

2011-05-05 23:16:57 -07:00

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

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

relay.c

Clean up relay_alloc_page_array() slightly by using vzalloc rather than vmalloc and memset

2010-11-05 08:21:34 -07:00

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

resources: add arch hook for preventing allocation in reserved areas

2010-12-17 10:01:09 -08:00

rtmutex_common.h

rtmutex: Simplify PI algorithm and make highest prio task get lock

2011-01-27 21:13:51 -05:00

rtmutex-debug.c

rtmutex: Simplify PI algorithm and make highest prio task get lock

2011-01-27 21:13:51 -05:00

rtmutex-debug.h

…

rtmutex-tester.c

rtmutex: tester: Remove the remaining BKL leftovers

2011-02-22 22:07:22 +01:00

rtmutex.c

rtmutex: Simplify PI algorithm and make highest prio task get lock

2011-01-27 21:13:51 -05:00

rtmutex.h

…

rwsem.c

…

sched_autogroup.c

Fix common misspellings

2011-03-31 11:26:23 -03:00

sched_autogroup.h

sched, autogroup: Stop going ahead if autogroup is disabled

2011-02-23 11:33:59 +01:00

sched_clock.c

sched: Add some clock info to sched_debug

2010-11-23 10:29:08 +01:00

sched_cpupri.c

sched: No need for bootmem special cases

2010-07-17 12:06:22 +02:00

sched_cpupri.h

sched: No need for bootmem special cases

2010-07-17 12:06:22 +02:00

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

sched.c

cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed

2011-05-28 17:02:57 +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

rcu: demote SRCU_SYNCHRONIZE_DELAY from kernel-parameter status

2011-01-14 04:56:49 -08:00

stacktrace.c

…

stop_machine.c

kthread: use kthread_create_on_node()

2011-03-22 17:44:01 -07:00

sys_ni.c

ipc: Add missing sys_ni entries for ipc/compat.c functions

2011-05-20 13:53:02 -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

sysctl_binary.c

open-style analog of vfs_path_lookup()

2011-03-14 09:15:28 -04:00

sysctl_check.c

sysctl_check: drop dead code

2011-03-23 19:46:51 -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

taskstats.c

taskstats: use appropriate printk priority level

2011-03-23 19:47:14 -07:00

test_kprobes.c

kprobes: Fix selftest to clear flags field for reusing probes

2010-10-14 08:55:27 +02:00

time.c

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-03-15 18:53:35 -07:00

timeconst.pl

…

timer.c

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-03-15 18:53:35 -07:00

tracepoint.c

jump label: Introduce static_branch() interface

2011-04-04 12:48:08 -04:00

tsacct.c

taskstats: use real microsecond granularity for CPU times

2010-10-27 18:03:17 -07:00

uid16.c

userns: user namespaces: convert several capable() calls

2011-03-23 19:47:08 -07:00

up.c

…

user_namespace.c

user_ns: improve the user_ns on-the-slab packaging

2011-01-13 08:03:18 -08:00

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

utsname_sysctl.c

…

utsname.c

ns proc: Add support for the uts namespace

2011-05-10 14:35:35 -07:00

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_sched.h

workqueue: implement concurrency managed dynamic worker pool

2010-06-29 10:07:14 +02:00

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