android_kernel_motorola_sm6375/kernel/sched
Repository files (latest commit first)
Filename Latest commit message Latest commit date
Juri Lelli 5bfd126e80 sched/deadline: Fix sched_yield() behavior
yield_task_dl() is broken:

 o it forces current to be throttled setting its runtime to zero;
 o it sets current's dl_se->dl_new to one, expecting that dl_task_timer()
   will queue it back with proper parameters at replenish time.

Unfortunately, dl_task_timer() has this check at the very beginning:

	if (!dl_task(p) || dl_se->dl_new)
		goto unlock;

So, it just bails out and the task is never replenished. It actually
yielded forever.

To fix this, introduce a new flag indicating that the task properly yielded
the CPU before its current runtime expired. While this is a little overdoing
at the moment, the flag would be useful in the future to discriminate between
"good" jobs (of which remaining runtime could be reclaimed, i.e. recycled)
and "bad" jobs (for which dl_throttled task has been set) that needed to be
stopped.

Reported-by: yjay.kim <yjay.kim@lge.com>
Signed-off-by: Juri Lelli <juri.lelli@gmail.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20140429103953.e68eba1b2ac3309214e3dc5a@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-05-07 11:51:31 +02:00
..
auto_group.c
auto_group.h
clock.c kernel: use macros from compiler.h instead of __attribute__((...)) 2014-04-07 16:36:11 -07:00
completion.c
core.c sched/deadline: Fix sched_yield() behavior 2014-05-07 11:51:31 +02:00
cpuacct.c
cpuacct.h
cpudeadline.c
cpudeadline.h
cpupri.c
cpupri.h
cputime.c sched: Sanitize irq accounting madness 2014-05-07 11:51:30 +02:00
deadline.c sched/deadline: Fix sched_yield() behavior 2014-05-07 11:51:31 +02:00
debug.c Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2014-04-03 13:05:42 -07:00
fair.c sched: Check for stop task appearance when balancing happens 2014-04-17 13:39:51 +02:00
features.h
idle.c
idle_task.c
Makefile
proc.c
rt.c sched: Check for stop task appearance when balancing happens 2014-04-17 13:39:51 +02:00
sched.h sched/numa: Fix task_numa_free() lockdep splat 2014-04-11 10:39:15 +02:00
stats.c kernel: audit/fix non-modular users of module_init in core code 2014-04-03 16:21:07 -07:00
stats.h
stop_task.c
wait.c