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SubjectRe: [PATCH 3/4] kmemcheck v4
Vegard Nossum wrote:
> From 4ce1c09e38b2402dc04f0246916f3c23abe8f3e1 Mon Sep 17 00:00:00 2001
> From: Vegard Nossum <vegard.nossum@gmail.com>
> Date: Thu, 14 Feb 2008 19:25:39 +0100
> Subject: [PATCH] kmemcheck: make SLUB use kmemcheck
>
> With kmemcheck enabled, SLUB needs to do this:
>
> 1. Request twice as much memory as would normally be needed. The bottom
> half
> of the memory is what the user actually sees and uses; the upper half
> contains the so-called shadow memory, which stores the status of each
> byte
> in the bottom half, e.g. initialized or uninitialized.
> 2. Tell kmemcheck which parts of memory that should be marked
> uninitialized.
> There are actually a few more states, such as "not yet allocated" and
> "recently freed".
>
> If a slab cache is set up using the SLAB_NOTRACK flag, it will never return
> memory that can take page faults because of kmemcheck.
>
> If a slab cache is NOT set up using the SLAB_NOTRACK flag, callers can
> still
> request memory with the __GFP_NOTRACK flag. This does not prevent the page
> faults from occuring, however, but marks the object in question as being
> initialized so that no warnings will ever be produced for this object.
>
> Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>

Looks good to me.

Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>


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