From d79fc0fc6645b0cf5cd980da76942ca6d6300fa4 Mon Sep 17 00:00:00 2001 From: Ingo Molnar <mingo@elte.hu> Date: Sat, 10 Sep 2005 00:26:12 -0700 Subject: [PATCH] sched: TASK_NONINTERACTIVE 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> --- kernel/sched.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'kernel/sched.c') diff --git a/kernel/sched.c b/kernel/sched.c index 24eed372d28..6da13bba3e2 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -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); -- cgit v1.2.3-70-g09d2