From: Wu Fengguang <fengguang.wu@intel.com>
Date: Sun, 4 Dec 2011 03:26:01 +0000 (-0600)
Subject: writeback: do strict bdi dirty_exceeded
X-Git-Tag: v3.3-rc1~112^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=82791940545be38810dfd5e03ee701e749f04aab;p=pandora-kernel.git

writeback: do strict bdi dirty_exceeded

This helps to reduce dirty throttling polls and hence CPU overheads.

bdi->dirty_exceeded typically only helps when suddenly starting 100+
dd's on a disk, in which case the dd's may need to poll
balance_dirty_pages() earlier than tsk->nr_dirtied_pause.

CC: Jan Kara <jack@suse.cz>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---

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