linux-kernel - Re: [PATCH 4/4] futex: Add FUTEX_LOCK with optional adaptive spinning

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Message-ID: <alpine.LFD.2.00.1005071829470.3401@localhost.localdomain>
Date:	Fri, 7 May 2010 18:30:54 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Darren Hart <dvhltc@...ibm.com>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"Peter W. Morreale" <pmorreale@...ell.com>,
	Rik van Riel <riel@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Sven-Thorsten Dietrich <sdietrich@...ell.com>,
	Chris Mason <chris.mason@...cle.com>,
	John Cooper <john.cooper@...rd-harmonic.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Ulrich Drepper <drepper@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH 4/4] futex: Add FUTEX_LOCK with optional adaptive
 spinning

On Fri, 7 May 2010, Peter Zijlstra wrote:

> On Fri, 2010-05-07 at 18:20 +0200, Thomas Gleixner wrote:
> > +               if (!owner->oncpu)
> 
> can't do that, that relies on __ARCH_WANT_UNLOCKED_CTXSW

Grr, yes.
 
> Please keep the code as near mutex_spin_on_owner() as possible.

There is no reason why we can't make that unconditional.

Thanks,

	tglx
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