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writeback: move global_dirty_limit into wb_domain

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This patch is a part of the series to define wb_domain which
represents a domain that wb's (bdi_writeback's) belong to and are
measured against each other in.  This will enable IO backpressure
propagation for cgroup writeback.

global_dirty_limit exists to regulate the global dirty threshold which
is a property of the wb_domain.  This patch moves hard_dirty_limit,
dirty_lock, and update_time into wb_domain.

This is pure reorganization and doesn't introduce any behavioral
changes.

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>
This commit is contained in:
Tejun Heo 2015-05-22 18:23:22 -04:00 • committed by Jens Axboe
parent 380c27ca33
commit dcc25ae76e
4 changed files with 44 additions and 28 deletions
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2
fs/fs-writeback.c
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@ -887,7 +887,7 @@ static long writeback_chunk_size(struct bdi_writeback *wb,
pages = LONG_MAX;
else {
pages = min(wb->avg_write_bandwidth / 2,
global_dirty_limit / DIRTY_SCOPE);
global_wb_domain.dirty_limit / DIRTY_SCOPE);
pages = min(pages, work->nr_pages);
pages = round_down(pages + MIN_WRITEBACK_PAGES,
MIN_WRITEBACK_PAGES);