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[PATCH] sched: TASK_NONINTERACTIVE

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This patch implements a task state bit (TASK_NONINTERACTIVE), which can be
used by blocking points to mark the task's wait as "non-interactive".  This
does not mean the task will be considered a CPU-hog - the wait will simply
not have an effect on the waiting task's priority - positive or negative
alike.  Right now only pipe_wait() will make use of it, because it's a
common source of not-so-interactive waits (kernel compilation jobs, etc.).

Signed-off-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:
Ingo Molnar
2005-09-10 00:26:12 -07:00
committed by Linus Torvalds
parent 95cdf3b799
commit d79fc0fc66
3 changed files with 16 additions and 2 deletions
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11
kernel/sched.c
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@@ -1260,6 +1260,16 @@ out_activate:
p->activated = -1;
}
/*
* 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.)
*/
if (old_state & TASK_NONINTERACTIVE)
__activate_task(p, rq);
else
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)
@@ -1268,7 +1278,6 @@ out_activate:
* the waker guarantees that the freshly woken up task is going
* to be considered on this CPU.)
*/
activate_task(p, rq, cpu == this_cpu);
if (!sync || cpu != this_cpu) {
if (TASK_PREEMPTS_CURR(p, rq))
resched_task(rq->curr);