linux-kernel - Re: [RFC][PATCH v2] slub: Keep page and object in sync in slab_alloc

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Message-ID: <0000013c4ee68811-d599982b-2d94-461f-bfc2-841215d64406-000000@email.amazonses.com>
Date:	Fri, 18 Jan 2013 18:23:16 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	RT <linux-rt-users@...r.kernel.org>,
	Clark Williams <clark@...hat.com>,
	John Kacur <jkacur@...il.com>,
	"Luis Claudio R. Goncalves" <lgoncalv@...hat.com>
Subject: Re: [RFC][PATCH v2] slub: Keep page and object in sync in
 slab_alloc_node()

On Fri, 18 Jan 2013, Steven Rostedt wrote:

> The problem is that the changes can happen on another CPU, which means
> that barrier isn't sufficient.

No these are per cpu variables that are only read locally. The
synchronization is not between processors.
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