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authorTejun Heo <tj@kernel.org>2015-09-29 12:47:53 -0400
committerJens Axboe <axboe@fb.com>2015-10-12 10:31:13 -0600
commitd60d1bddd5b642711a237511845853755b25bf1f (patch)
treee5790b6d703d30fcd8c92f5760fdcc0e165fc912 /include
parentb817525a4a80c04e4ca44192d97a1ffa9f2be572 (diff)
downloadlinux-d60d1bddd5b642711a237511845853755b25bf1f.tar.bz2
writeback: memcg dirty_throttle_control should be initialized with wb->memcg_completions
MDTC_INIT() is used to initialize dirty_throttle_control for memcg domains. It used DTC_INIT_COMMON() to initialized mdtc->wb and ->wb_completions which is incorrect as DTC_INIT_COMMON() sets the latter to wb->completions instead of wb->memcg_completions. This can lead to wildly incorrect results when calculating the proportion of dirty memory the memcg domain should get. Remove DTC_INIT_COMMON() and update MDTC_INIT() to initialize mdtc->wb_completions to wb->memcg_completions. Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: c2aa723a6093 ("writeback: implement memcg writeback domain based throttling") Signed-off-by: Jens Axboe <axboe@fb.com>
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