linux-kernel - Re: [PATCH 03/15] kmemleak: Add the slab memory allocation/freeing hooks

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Message-ID: <Pine.LNX.4.64.0812181048160.12300@quilx.com>
Date:	Thu, 18 Dec 2008 10:49:07 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Catalin Marinas <catalin.marinas@....com>
cc:	Pekka Enberg <penberg@...helsinki.fi>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/15] kmemleak: Add the slab memory allocation/freeing
 hooks

On Thu, 18 Dec 2008, Catalin Marinas wrote:

> In the ____cache_alloc() kmemleak clears the
> cachep->array->entry[ac->avail] pointer but this may not be enough as
> freed and later re-allocated objects may have pointers in the alien
> cache (is that correct?). A better approach (haven't tried it yet) would
> be not to scan objects allocated via alloc_arraycache() at all. However,
> there is still the initarray_cache/generic which are automatically
> scanned via the data section (unless I add an attribute to place them in
> a different, not scanned, section).

An allocated object is not part of any cache in SLAB. Only freed objects
are kept in the slab queues. A freed object can only be in one queue at a
time.

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