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

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Message-ID: <1277885485.1868.74.camel@laptop>
Date:	Wed, 30 Jun 2010 10:11:25 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jan Beulich <JBeulich@...ell.com>
Cc:	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	jeremy.fitzhardinge@...rix.com,
	Ky Srinivasan <KSrinivasan@...ell.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4, v2] x86: enlightenment for ticket spin locks -
 improve yield behavior on Xen

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.
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