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authorChen, Kenneth W <kenneth.w.chen@intel.com>2005-11-09 15:45:29 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-09 16:07:44 -0800
commita47ab9371e664952b1104a70ec8e9b74db3f7a5f (patch)
tree4efadd76dcd5c1712ce2e337ef2e8a87acdc8518
parent6730c3c14421b7c924d06e31bb66e0adad225547 (diff)
[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>
-rw-r--r--kernel/sched.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index ac3f5cc3bb51..b6506671b2be 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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