linux-kernel - Re: [patch 2/3] scheduler: add full memory barriers upon task switch at runqueue lock/unlock

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Date:	Mon, 01 Feb 2010 17:00:00 +0100
From:	Mike Galbraith <efault@....de>
To:	rostedt@...dmis.org
Cc:	Nick Piggin <npiggin@...e.de>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Nicholas Miell <nmiell@...cast.net>, laijs@...fujitsu.com,
	dipankar@...ibm.com, josh@...htriplett.org, dvhltc@...ibm.com,
	niv@...ibm.com, tglx@...utronix.de, Valdis.Kletnieks@...edu,
	dhowells@...hat.com
Subject: Re: [patch 2/3] scheduler: add full memory barriers upon task
 switch at runqueue lock/unlock

On Mon, 2010-02-01 at 10:23 -0500, Steven Rostedt wrote:
> On Tue, 2010-02-02 at 01:58 +1100, Nick Piggin wrote:

> > So I would prefer the simpler version that doesn't add overhead to
> > ctxsw, at least for the first implementation.
> 
> Acked-by: Steven Rostedt <rostedt@...dmis.org>
> 
> ;-)

Yup, fast path needs to _lose_ some weight.

	-Mike

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