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authorWu Fengguang <fengguang.wu@intel.com>2009-09-23 21:56:00 +0800
committerJens Axboe <jens.axboe@oracle.com>2009-09-25 18:08:24 +0200
commit3a2e9a5a2afc1a2d2c548b8987f133235cebe933 (patch)
treecb05d2873b2701ded758a7087de5af2932a97736 /fs/fs-writeback.c
parenta5989bdc981ec85e0734ac22519cc0b780813d7b (diff)
writeback: balance_dirty_pages() shall write more than dirtied pages
Some filesystem may choose to write much more than ratelimit_pages before calling balance_dirty_pages_ratelimited_nr(). So it is safer to determine number to write based on real number of dirtied pages. Otherwise it is possible that loop { btrfs_file_write(): dirty 1024 pages balance_dirty_pages(): write up to 48 pages (= ratelimit_pages * 1.5) } in which the writeback rate cannot keep up with dirty rate, and the dirty pages go all the way beyond dirty_thresh. The increased write_chunk may make the dirtier more bumpy. So filesystems shall be take care not to dirty too much at a time (eg. > 4MB) without checking the ratelimit. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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