From: Ingo Molnar <mingo@elte.hu>
To: chen Shang <shangcs@gmail.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
linux-kernel@vger.kernel.org, rml@tech9.net,
Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] kernel <linux-2.6.11.10> kernel/sched.c
Date: Fri, 20 May 2005 11:49:09 +0200 [thread overview]
Message-ID: <20050520094909.GA16923@elte.hu> (raw)
In-Reply-To: <855e4e46050520001215be7cde@mail.gmail.com>
* chen Shang <shangcs@gmail.com> wrote:
> I minimized my patch and against to 2.6.12-rc4 this time, see below.
looks good - i've done some small style/whitespace cleanups and renamed
prio to old_prio, patch against -rc4 below.
Ingo
From: Chen Shang <shangcs@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
--- linux/kernel/sched.c.orig
+++ linux/kernel/sched.c
@@ -2613,7 +2613,7 @@ asmlinkage void __sched schedule(void)
struct list_head *queue;
unsigned long long now;
unsigned long run_time;
- int cpu, idx;
+ int cpu, idx, old_prio;
/*
* Test if we are atomic. Since do_exit() needs to call into
@@ -2735,9 +2735,15 @@ go_idle:
delta = delta * (ON_RUNQUEUE_WEIGHT * 128 / 100) / 128;
array = next->array;
- dequeue_task(next, array);
+ old_prio = next->prio;
+
recalc_task_prio(next, next->timestamp + delta);
- enqueue_task(next, array);
+
+ if (unlikely(old_prio != next->prio)) {
+ dequeue_task(next, array);
+ enqueue_task(next, array);
+ } else
+ requeue_task(next, array);
}
next->activated = 0;
switch_tasks:
next prev parent reply other threads:[~2005-05-20 9:56 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-19 16:56 [PATCH] kernel <linux-2.6.11.10> kernel/sched.c chen Shang
2005-05-20 3:26 ` Nick Piggin
2005-05-20 4:17 ` chen Shang
2005-05-20 4:32 ` Lee Revell
2005-05-20 5:13 ` Nick Piggin
2005-05-20 7:12 ` chen Shang
2005-05-20 7:21 ` Nick Piggin
2005-05-20 7:36 ` Con Kolivas
2005-05-20 13:41 ` chen Shang
2005-05-20 9:49 ` Ingo Molnar [this message]
2005-05-20 10:40 ` Con Kolivas
2005-05-20 11:34 ` Ingo Molnar
2005-05-22 4:41 ` Chen Shang
2005-05-23 7:11 ` Ingo Molnar
2005-05-23 14:45 ` Chen Shang
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