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[PATCH] optimize activate_task() 

recalc_task_prio() is called from activate_task() to calculate dynamic
priority and interactive credit for the activating task.  For real-time
scheduling process, all that dynamic calculation is thrown away at the end
because rt priority is fixed.  Patch to optimize recalc_task_prio() away
for rt processes.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <piggin@cyberone.com.au>
Cc: Con Kolivas <kernel@kolivas.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Chen, Kenneth W 2005-11-09 15:45:29 -08:00 committed by Linus Torvalds
parent 6730c3c144
commit a47ab9371e
1 changed files with 2 additions and 1 deletions
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3
kernel/sched.c
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@ -815,7 +815,8 @@ static void activate_task(task_t *p, runqueue_t *rq, int local)
}
#endif
p->prio = recalc_task_prio(p, now);
if (!rt_task(p))
p->prio = recalc_task_prio(p, now);
/*
* This checks to make sure it's not an uninterruptible task