linux-kernel - Re: [PATCH 1/2] slub: fix leakage

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Message-ID: <Pine.LNX.4.64.0711031127091.5395@schroedinger.engr.sgi.com>
Date:	Sat, 3 Nov 2007 11:31:23 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Hugh Dickins <hugh@...itas.com>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] slub: fix leakage

On Sat, 3 Nov 2007, Hugh Dickins wrote:

> The culprit turns out to be __slab_alloc(), where it copes with the race
> that another task has assigned the cpu slab while we were allocating one.
> Don't rush off to load_freelist there: that assumes c->freelist is empty,
> and will lose all of its free slots when c->page->freelist is not empty.
> Instead just do a local allocation from c->freelist when it has one.

Hmmm.. Right. This will require some fixes to the optimizations in mm.

Acked-by: Christoph Lameter <clameter@....com>
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