From: Wu Fengguang <fengguang.wu@intel.com>
Date: Thu, 14 Apr 2011 13:52:37 +0000 (-0600)
Subject: writeback: fix dirtied pages accounting on sub-page writes
X-Git-Tag: v3.3-rc1~112^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d3bc1fef9389e409a772ea174a5e41a6f93d9b7b;p=pandora-kernel.git

writeback: fix dirtied pages accounting on sub-page writes

When dd in 512bytes, generic_perform_write() calls
balance_dirty_pages_ratelimited() 8 times for the same page, but
obviously the page is only dirtied once.

Fix it by accounting tsk->nr_dirtied and bdp_ratelimits at page dirty time.

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