linux-kernel - Re: slub: Lockout validation scans during freeing of object

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Message-ID: <alpine.DEB.2.00.1112141913500.27595@chino.kir.corp.google.com>
Date:	Wed, 14 Dec 2011 19:14:03 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Pekka Enberg <penberg@...nel.org>
cc:	Christoph Lameter <cl@...ux.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: slub: Lockout validation scans during freeing of object

On Mon, 12 Dec 2011, Pekka Enberg wrote:

> > Subject: slub: Lockout validation scans during freeing of object
> > 
> > Slab validation can run right now while the slab free paths prepare
> > the redzone fields etc around the objects in preparation of the
> > actual freeing of the object. This can lead to false positives.
> > 
> > Take the node lock unconditionally during free so that the validation
> > can examine objects without them being disturbed by freeing operations.
> > 
> > Signed-off-by: Christoph Lameter <cl@...ux.com>

Acked-by: David Rientjes <rientjes@...gle.com>
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