writeback, blkcg: associate each blkcg_gq with the corresponding bdi_writeback_congested

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A blkg (blkcg_gq) can be congested and decongested independently from
other blkgs on the same request_queue.  Accordingly, for cgroup
writeback support, the congestion status at bdi (backing_dev_info)
should be split and updated separately from matching blkg's.

This patch prepares by adding blkg->wb_congested and associating a
blkg with its matching per-blkcg bdi_writeback_congested on creation.

v2: Updated to associate bdi_writeback_congested instead of
    bdi_writeback.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

...

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Tejun Heo 2015-05-22 17:13:38 -04:00 • committed by Jens Axboe

parent 52ebea749a

commit ce7acfeaf0

2 changed files with 21 additions and 2 deletions

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6

include/linux/blk-cgroup.h

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