From: Wu Fengguang <fengguang.wu@intel.com>
Date: Sat, 3 Dec 2011 00:21:51 +0000 (-0600)
Subject: writeback: set max_pause to lowest value on zero bdi_dirty
X-Git-Tag: v3.2-rc6~21^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=82e230a07de3812a5e87a27979f033dad59172e3;p=pandora-kernel.git

writeback: set max_pause to lowest value on zero bdi_dirty

Some trace shows lots of bdi_dirty=0 lines where it's actually some
small value if w/o the accounting errors in the per-cpu bdi stats.

In this case the max pause time should really be set to the smallest
(non-zero) value to avoid IO queue underrun and improve throughput.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
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