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| author | Con Kolivas <kernel@kolivas.org> | 2006-03-31 02:31:25 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-31 12:18:58 -0800 |
| commit | e7c38cb49c6cc05bc11f70d9e9889da1c4a0d37f (patch) | |
| tree | 538e26f5ba32d052083dea53536c5366978838c8 /kernel/sched.c | |
| parent | 3dee386e14045484a6c41c8f03a263f9d79de740 (diff) | |
| download | blackbird-op-linux-e7c38cb49c6cc05bc11f70d9e9889da1c4a0d37f.tar.gz blackbird-op-linux-e7c38cb49c6cc05bc11f70d9e9889da1c4a0d37f.zip | |
[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>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index f55ce5adac55..589e55a42214 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -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) |
