From: Christoph Lameter <clameter@sgi.com>
To: Vegard Nossum <vegard.nossum@gmail.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>,
Pekka Enberg <penberg@cs.helsinki.fi>,
Andi Kleen <andi@firstfloor.org>,
Richard Knutsson <ricknu-0@student.ltu.se>
Subject: Re: [PATCH 1/2] kmemcheck v3
Date: Thu, 7 Feb 2008 23:10:01 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0802072307040.22292@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <47AB79D4.2070605@gmail.com>
On Thu, 7 Feb 2008, Vegard Nossum wrote:
> - DMA can be a problem since there's generally no way for kmemcheck to
> determine when/if a chunk of memory is used for DMA. Ideally, DMA should be
> allocated with untracked caches, but this requires annotation of the
> drivers in question.
There is a fundamental misunderstanding here: GFP_DMA allocations have
nothing to do with DMA. Rather GFP_DMA means allocate memory in a special
range of physical memory that is required by legacy devices that cannot
use the high address bits for one or the other reason. Any regular
memory can be used for DMA.
Could you refactor the patch a bit? This is quite a big patch.
next prev parent reply other threads:[~2008-02-08 7:11 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-07 21:36 Vegard Nossum
2008-02-07 21:39 ` [PATCH 2/2] " Vegard Nossum
2008-02-07 21:53 ` [PATCH 1/2] " Christoph Lameter
2008-02-07 22:12 ` Vegard Nossum
2008-02-07 22:53 ` Christoph Lameter
2008-02-07 23:18 ` Vegard Nossum
2008-02-07 23:32 ` Christoph Lameter
2008-02-08 6:40 ` Pekka Enberg
2008-02-08 8:09 ` Ingo Molnar
2008-02-08 6:30 ` Pekka Enberg
2008-02-08 6:33 ` Pekka Enberg
2008-02-08 7:10 ` Christoph Lameter [this message]
2008-02-08 7:48 ` Pekka Enberg
2008-02-08 11:55 ` Andi Kleen
2008-02-08 11:31 ` Pekka Enberg
2008-02-08 12:10 ` Andi Kleen
2008-02-08 11:39 ` Pekka Enberg
2008-02-08 11:37 ` Pekka Enberg
2008-02-08 12:15 ` Andi Kleen
2008-02-08 11:43 ` Pekka Enberg
2008-02-08 12:18 ` Vegard Nossum
2008-02-08 13:20 ` Andi Kleen
2008-02-08 12:59 ` Vegard Nossum
2008-02-08 13:48 ` Andi Kleen
2008-02-09 9:33 ` Ingo Molnar
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