[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>
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@ -1273,17 +1273,17 @@ out_activate:
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* sleep_avg beyond just interactive state.
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*/
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p->sleep_type = SLEEP_NONINTERACTIVE;
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}
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} else
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/*
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* Tasks that have marked their sleep as noninteractive get
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* woken up without updating their sleep average. (i.e. their
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* sleep is handled in a priority-neutral manner, no priority
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* boost and no penalty.)
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* woken up with their sleep average not weighted in an
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* interactive way.
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*/
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if (old_state & TASK_NONINTERACTIVE)
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__activate_task(p, rq);
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else
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p->sleep_type = SLEEP_NONINTERACTIVE;
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activate_task(p, rq, cpu == this_cpu);
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/*
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* Sync wakeups (i.e. those types of wakeups where the waker
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