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author | Tejun Heo <tj@kernel.org> | 2015-05-23 01:23:26 +0300 |
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committer | Jens Axboe <axboe@fb.com> | 2015-06-02 17:38:13 +0300 |
commit | daddfa3cb30ebfe322d50af146d830fd435ddb1f (patch) | |
tree | 4b67764441edb8e62798565e314759ce048218dd /net/9p | |
parent | b1cbc6d40c85639d405fee37c7bb688c3bf468d6 (diff) | |
download | linux-daddfa3cb30ebfe322d50af146d830fd435ddb1f.tar.xz |
writeback: add dirty_throttle_control->pos_ratio
wb_position_ratio() is used to calculate pos_ratio, which is used for
two purposes. wb_update_dirty_ratelimit() uses it to adjust
wb->[balanced_]dirty_ratelimit gradually and balance_dirty_pages() to
immediately adjust dirty_ratelimit right before applying it to
determine pause duration.
While wb_update_dirty_ratelimit() is separately rate limited from
balance_dirty_pages(), on the run where the ratelimit is updated, we
end up calculating pos_ratio twice with the same parameters.
This patch adds dirty_throttle_control->pos_ratio.
balance_dirty_pages() calculates it once per run and
wb_update_dirty_ratelimit() uses the value stored in
dirty_throttle_control.
This removes the duplicate calculation and also will help implementing
memcg wb_domain.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Greg Thelen <gthelen@google.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'net/9p')
0 files changed, 0 insertions, 0 deletions