tree d1e47354263b7c930a7ec4428909693d10a10c50
parent 54848d73f9f254631303d6eab9b976855988b266
author Wu Fengguang <fengguang.wu@intel.com> 1302789157 -0600
committer Wu Fengguang <fengguang.wu@intel.com> 1324189222 +0800

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>