From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: "'Ingo Molnar'" <mingo@elte.hu>,
"'Nick Piggin'" <nickpiggin@yahoo.com.au>,
"'Andrew Morton'" <akpm@osdl.org>
Cc: <linux-kernel@vger.kernel.org>
Subject: [patch] optimize activate_task()
Date: Wed, 26 Oct 2005 18:53:05 -0700 [thread overview]
Message-ID: <200510270153.j9R1r5g27370@unix-os.sc.intel.com> (raw)
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
next reply other threads:[~2005-10-27 1:53 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-27 1:53 Chen, Kenneth W [this message]
2005-10-28 8:38 ` Ingo Molnar
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