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writeback: track if we're sleeping on progress in balance_dirty_pages()

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Note in the bdi_writeback structure whenever a task ends up sleeping
waiting for progress. We can use that information in the lower layers
to increase the priority of writes.

Signed-off-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jens Axboe 2016-09-01 10:20:33 -06:00
parent 8e1de26cd5
commit b57d74aff9
3 changed files with 4 additions and 0 deletions
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1
mm/backing-dev.c
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@ -310,6 +310,7 @@ static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
spin_lock_init(&wb->work_lock);
INIT_LIST_HEAD(&wb->work_list);
INIT_DELAYED_WORK(&wb->dwork, wb_workfn);
wb->dirty_sleep = jiffies;
wb->congested = wb_congested_get_create(bdi, blkcg_id, gfp);
if (!wb->congested)