linux-kernel - RE: [PATCH 1/3 v2] media: Add a cached version of the contiguous video buffers

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Date:	Wed, 04 Aug 2010 09:55:16 +0200
From:	Pawel Osciak <p.osciak@...sung.com>
To:	'Richard Röjfors' <richard.rojfors@...agicore.com>,
	'Linux Media Mailing List' <linux-media@...r.kernel.org>
Cc:	'Linux Kernel Mailing List' <linux-kernel@...r.kernel.org>,
	'Mauro Carvalho Chehab' <mchehab@...hat.com>,
	'Douglas Schilling Landgraf' <dougsland@...il.com>,
	'Samuel Ortiz' <sameo@...ux.intel.com>
Subject: RE: [PATCH 1/3 v2] media: Add a cached version of the contiguous video
 buffers

Hi Richard,

>Richard Röjfors wrote:
>This patch adds another init functions in the videobuf-dma-contig
>which is named _cached in the end. It creates a buffer factory
>which allocates buffers using kmalloc and the buffers are cached.
>

Before I review this in more detail, could you elaborate more on
this? How large are your buffers, can kmalloc really allocate them
for you? I am not convinced how this is supposed to work reliably,
especially in a long-running systems.

Best regards
--
Pawel Osciak
Linux Platform Group
Samsung Poland R&D Center





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