linux-kernel - Re: [patch] sched: add the other missing clock update to migrate

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Message-Id: <1258913689.9457.15.camel@marge.simson.net>
Date:	Sun, 22 Nov 2009 19:14:49 +0100
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] sched: add the other missing clock update to
 migrate_task()

On Sun, 2009-11-22 at 17:58 +0100, Mike Galbraith wrote:
> On Sun, 2009-11-22 at 14:16 +0100, Peter Zijlstra wrote:
> 
> > We should make double_rq_lock() and double_lock_balance() behave
> > equivalent wrt update_rq_clock().
> > 
> > Current, depending on CONFIG_PREEMPT, double_lock_balance() already
> > updates both rq clocks.
> 
> Hm, right.  Better plan.

Oops, nope.  Consistency is still a good plan, however, that update is
still needed, because it's the case where we're _not_ going to use the
migration thread.

	-Mike

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