linux-kernel - Re: [PATCH] sched: Move the sleeping while atomic checks early in cond

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Date:	Fri, 10 Jul 2009 20:29:48 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: Move the sleeping while atomic checks early in
	cond_resched()

On Fri, Jul 10, 2009 at 08:13:42PM +0200, Peter Zijlstra wrote:
> On Fri, 2009-07-10 at 20:08 +0200, Frederic Weisbecker wrote:
> 
> > > Right, how about renaming these to _cond_resched_{lock,softirq}, and
> > > added a __might_sleep() definition for !DEBUG_SPINLOCK_SLEEP and add
> > > macro wrappers to sched.c for these two as well?
> > 
> > I did that first but thought that might_sleep() would fail in a spinlock
> > held or softirq context, right?
> 
> Ah, right.. maybe we can add a preempt_count_offset parameter to
> __might_sleep() such that it will compensate for the pending
> spin_unlock()/local_bh_enable().


Good idea, I'm trying that.

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