linux-kernel - Re: [PATCH] sched: fix need_resched() when checking peempt

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Message-ID: <BANLkTin2r7omjQC9ro0f2_qEc8SzPX33Pg@mail.gmail.com>
Date:	Tue, 24 May 2011 21:50:56 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>,
	Yong Zhang <yong.zhang0@...il.com>
Subject: Re: [PATCH] sched: fix need_resched() when checking peempt

On Tue, May 24, 2011 at 9:39 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> On Tue, 2011-05-24 at 21:27 +0800, Hillf Danton wrote:
>> When checking if current task could be preempted by a newly woken task,
>> further check could be bypassed if the current thread is different from
>> the current task of run-queue, and it is corrected accordingly.
>
> Ug, that change log is an obfuscated mess. But looking at the actual
> patch, I figured what you wanted to say. How about this:
>
> ----
> The RT preempt check tests the wrong task if NEED_RESCHED is set. It
> currently checks the local CPU task. It is suppose to check the task
> that is running on the run queue we are about to wake another task on.
> ----
>
Thanks, it is great changelog:)

Hillf
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