linux-kernel - Re: [patch 1/4] sched: Separate the scheduler entry for preemption

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Date:	Wed, 22 Jun 2011 14:43:28 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch 1/4] sched: Separate the scheduler entry for preemption

On Wed, Jun 22, 2011 at 05:52:13PM -0000, Thomas Gleixner wrote:
> Block-IO and workqueues call into notifier functions from the
> scheduler core code with interrupts and preemption disabled. These
> calls should be made before entering the scheduler core.
> 
> To simplify this, separate the scheduler core code into
> __schedule(). __schedule() is directly called from the places which
> set PREEMPT_ACTIVE and from schedule(). This allows us to add the work
> checks into schedule(), so they are only called when a task voluntary
> goes to sleep.

I don't think that works.  We'll need to flush the block requests even
for an involuntary schedule.

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