* [patch] optimize activate_task()
@ 2005-10-27 1:53 Chen, Kenneth W
2005-10-28 8:38 ` Ingo Molnar
0 siblings, 1 reply; 2+ messages in thread
From: Chen, Kenneth W @ 2005-10-27 1:53 UTC (permalink / raw)
To: 'Ingo Molnar', 'Nick Piggin', 'Andrew Morton'
Cc: linux-kernel
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>
--- ./kernel/sched.c.orig 2005-10-26 10:39:40.594015398 -0700
+++ ./kernel/sched.c 2005-10-26 18:43:12.187410006 -0700
@@ -833,7 +833,8 @@ static void activate_task(task_t *p, run
}
#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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [patch] optimize activate_task()
2005-10-27 1:53 [patch] optimize activate_task() Chen, Kenneth W
@ 2005-10-28 8:38 ` Ingo Molnar
0 siblings, 0 replies; 2+ messages in thread
From: Ingo Molnar @ 2005-10-28 8:38 UTC (permalink / raw)
To: Chen, Kenneth W
Cc: 'Nick Piggin', 'Andrew Morton', linux-kernel
* Chen, Kenneth W <kenneth.w.chen@intel.com> wrote:
> 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>
Ingo
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2005-10-28 8:38 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-10-27 1:53 [patch] optimize activate_task() Chen, Kenneth W
2005-10-28 8:38 ` Ingo Molnar
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®