linux-kernel - Re: [PATCH 4/4, v2] x86: enlightenment for ticket spin locks

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Message-Id: <4C2B21300200007800008BDC@vpn.id2.novell.com>
Date:	Wed, 30 Jun 2010 09:49:20 +0100
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	"Peter Zijlstra" <peterz@...radead.org>
Cc:	<jeremy.fitzhardinge@...rix.com>, <mingo@...e.hu>,
	<tglx@...utronix.de>, "Ky Srinivasan" <KSrinivasan@...ell.com>,
	<linux-kernel@...r.kernel.org>, <hpa@...or.com>
Subject: Re: [PATCH 4/4, v2] x86: enlightenment for ticket spin locks -
	 improve yield behavior on Xen

>>> On 30.06.10 at 10:11, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, 2010-06-29 at 15:35 +0100, Jan Beulich wrote:
>> 
>> The (only) additional overhead this introduces for native execution is
>> the writing of the owning CPU in the lock acquire paths. 
> 
> Uhm, and growing the size of spinlock_t to 6 (or 8 bytes when aligned)
> bytes when NR_CPUS>256.

Indeed, I should have mentioned that. Will do so in an eventual
next version.

Jan

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