From: Jens Axboe <jens.axboe@oracle.com>
Date: Mon, 17 May 2010 10:51:03 +0000 (+0200)
Subject: writeback: disable periodic old data writeback for !dirty_writeback_centisecs
X-Git-Tag: v2.6.35-rc1~442^2~56
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=69b62d01ec44fe0d505d89917392347732135a4d;p=pandora-kernel.git

writeback: disable periodic old data writeback for !dirty_writeback_centisecs

Prior to 2.6.32, setting /proc/sys/vm/dirty_writeback_centisecs disabled
periodic dirty writeback from kupdate. This got broken and now causes
excessive sys CPU usage if set to zero, as we'll keep beating on
schedule().

Cc: stable@kernel.org
Reported-by: Justin Maggard <jmaggard10@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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