From: Hans Verkuil <hverkuil@xs4all.nl>
Date: Fri, 26 Nov 2010 09:47:28 +0000 (-0300)
Subject: [media] V4L: improve the BKL replacement heuristic
X-Git-Tag: v2.6.37-rc7~22^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=879aa24d6394aa04b690a600a41ff500441ad384;p=pandora-kernel.git

[media] V4L: improve the BKL replacement heuristic

The BKL replacement mutex had some serious performance side-effects on
V4L drivers. It is replaced by a better heuristic that works around the
worst of the side-effects.

Read the v4l2-dev.c comments for the whole sorry story. This is a
temporary measure only until we can convert all v4l drivers to use
unlocked_ioctl.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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