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[PATCH] sched: make task_noninteractive use sleep_type 

Alterations to the pipe code in the kernel made it possible for relative
starvation to occur with tasks that slept waiting on a pipe getting unfair
priority bonuses even if they were otherwise fully cpu bound so the
TASK_NONINTERACTIVE flag was introduced which prevented any change to
sleep_avg while sleeping waiting on a pipe.  This change also leads to the
converse though, preventing any priority boost from occurring in truly
interactive tasks that wait on pipes.

Convert the TASK_NONINTERACTIVE flag to set sleep_type to SLEEP_NONINTERACTIVE
which will allow a linear bonus to priority based on sleep time thus allowing
interactive tasks to get high priority if they sleep enough.

Signed-off-by: Con Kolivas <kernel@kolivas.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Con Kolivas 2006-03-31 02:31:25 -08:00 committed by Linus Torvalds
parent 3dee386e14
commit e7c38cb49c
1 changed files with 8 additions and 8 deletions
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16
kernel/sched.c
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@ -1273,18 +1273,18 @@ out_activate:
* sleep_avg beyond just interactive state.
*/
p->sleep_type = SLEEP_NONINTERACTIVE;
}
} else
/*
* Tasks that have marked their sleep as noninteractive get
* woken up without updating their sleep average. (i.e. their
* sleep is handled in a priority-neutral manner, no priority
* boost and no penalty.)
* woken up with their sleep average not weighted in an
* interactive way.
*/
if (old_state & TASK_NONINTERACTIVE)
__activate_task(p, rq);
else
activate_task(p, rq, cpu == this_cpu);
if (old_state & TASK_NONINTERACTIVE)
p->sleep_type = SLEEP_NONINTERACTIVE;
activate_task(p, rq, cpu == this_cpu);
/*
* Sync wakeups (i.e. those types of wakeups where the waker
* has indicated that it will leave the CPU in short order)