linux-kernel - Re: sched: fix/optimise some issues

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Message-ID: <1311189100.29152.75.camel@twins>
Date:	Wed, 20 Jul 2011 21:11:40 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	stephan.baerwolf@...ilmenau.de
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	ncrao@...gle.com
Subject: Re: sched: fix/optimise some issues

On Wed, 2011-07-20 at 15:42 +0200, Stephan Bärwolf wrote:
> 
> The function "check_preempt_wakeup" (kernel/sched_fair.c:1885)
> will preempt idle-task (for non-idle task), even if WAKEUP_PREEMPT
> is not featured (because of a too late checking the feature).
> This patches moves the checking of WAKEUP_PREEMT in front of
> idle-preemtion. 

That's actually on purpose, the WAKE_PREEMPT feature is supposed to only
affect preemption between SCHED_OTHER tasks.
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