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linux/kernel/sched
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Michael wang eb7a59b2c8 sched/fair: Reset se-depth when task switched to FAIR 
Sasha reported:

[  522.645288] BUG: unable to handle kernel NULL pointer dereference at ...
[  522.646271] IP: [<ffffffff81186c6f>] check_preempt_wakeup+0x11f/0x210
		...
[  522.650021] Call Trace:
[  522.650021]  <IRQ>
[  522.650021]  [<ffffffff8117361d>] check_preempt_curr+0x3d/0xb0
[  522.650021]  [<ffffffff81175d88>] ttwu_do_wakeup+0x18/0x130
		...

which was caused by the se-depth changed during the time when task is not
FAIR, and we will use the wrong depth value after it switched back to FAIR.

This patch reset the depth at the time when task switched to FAIR, make sure
that we always have the correct value when task is FAIR.

Cc: Ingo Molnar <mingo@kernel.org>
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Tested-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Michael Wang <wangyun@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/5305732D.70001@linux.vnet.ibm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
 		2014-02-21 21:43:17 +01:00
..
Makefile sched/idle: Move cpu/idle.c to sched/idle.c 2014-02-11 09:58:30 +01:00
auto_group.c sched/autogroup: Fix race with task_groups list 2013-05-28 09:40:22 +02:00
auto_group.h Revert "sched/autogroup: Fix crash on reboot when autogroup is disabled" 2012-12-11 10:23:45 +01:00
clock.c sched/clock: Fixup early initialization 2014-01-23 14:48:36 +01:00
completion.c sched: Move completion code from core.c to completion.c 2013-11-06 07:49:19 +01:00
core.c sched: Add statistic for newidle load balance cost 2014-02-11 09:58:18 +01:00
cpuacct.c cgroup: replace cftype->read_seq_string() with cftype->seq_show() 2013-12-05 12:28:04 -05:00
cpuacct.h sched/cpuacct: Initialize root cpuacct earlier 2013-04-10 13:54:20 +02:00
cpudeadline.c sched/deadline: Fix sparse static warnings 2014-01-16 09:27:03 +01:00
cpudeadline.h sched/deadline: speed up SCHED_DEADLINE pushes with a push-heap 2014-01-13 13:46:46 +01:00
cpupri.c sched: Fix some kernel-doc warnings 2013-07-18 09:58:21 +02:00
cpupri.h
…
cputime.c sched: Implement task_nice() as static inline function 2014-02-09 15:28:23 +01:00
deadline.c sched: Push down pre_schedule() and idle_balance() 2014-02-11 09:58:10 +01:00
debug.c sched: Add statistic for newidle load balance cost 2014-02-11 09:58:18 +01:00
fair.c sched/fair: Reset se-depth when task switched to FAIR 2014-02-21 21:43:17 +01:00
features.h sched/numa: Resist moving tasks towards nodes with fewer hinting faults 2013-10-09 12:40:27 +02:00
idle.c sched/idle: Move cpu/idle.c to sched/idle.c 2014-02-11 09:58:30 +01:00
idle_task.c sched: Push down pre_schedule() and idle_balance() 2014-02-11 09:58:10 +01:00
proc.c sched: Change get_rq_runnable_load() to static and inline 2013-06-27 10:07:44 +02:00
rt.c sched: Push down pre_schedule() and idle_balance() 2014-02-11 09:58:10 +01:00
sched.h sched: Push down pre_schedule() and idle_balance() 2014-02-11 09:58:10 +01:00
stats.c fix a leak in /proc/schedstats 2013-04-29 15:41:45 -04:00
stats.h sched: Micro-optimize by dropping unnecessary task_rq() calls 2013-09-25 13:51:06 +02:00
stop_task.c sched: Push put_prev_task() into pick_next_task() 2014-02-10 16:17:13 +01:00
wait.c sched: Move wait code from core.c to wait.c 2013-11-06 07:49:18 +01:00