linux-kernel - Re: [PATCH 1/2] kmemcheck v3

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Message-ID: <84144f020802072240o20ae7420x2e404e731a629c24@mail.gmail.com>
Date:	Fri, 8 Feb 2008 08:40:35 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Christoph Lameter" <clameter@....com>
Cc:	"Vegard Nossum" <vegard.nossum@...il.com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>, "Andi Kleen" <andi@...stfloor.org>,
	"Richard Knutsson" <ricknu-0@...dent.ltu.se>
Subject: Re: [PATCH 1/2] kmemcheck v3

On Feb 8, 2008 1:32 AM, Christoph Lameter <clameter@....com> wrote:
> But the slab layer allocates pages < PAGE_SIZE. You need to take a fault
> right? So each object would need its own page?

No. We allocate a shadow page for each data page which we then use as
a per-byte "bitmap." For every tracked _page_ we take the page fault
always.
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