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writeback: track if we're sleeping on progress in balance_dirty_pages()
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>
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@ -116,6 +116,8 @@ struct bdi_writeback {
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struct list_head work_list;
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struct delayed_work dwork; /* work item used for writeback */
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unsigned long dirty_sleep; /* last wait */
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struct list_head bdi_node; /* anchored at bdi->wb_list */
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#ifdef CONFIG_CGROUP_WRITEBACK
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@ -310,6 +310,7 @@ static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
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spin_lock_init(&wb->work_lock);
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INIT_LIST_HEAD(&wb->work_list);
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INIT_DELAYED_WORK(&wb->dwork, wb_workfn);
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wb->dirty_sleep = jiffies;
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wb->congested = wb_congested_get_create(bdi, blkcg_id, gfp);
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if (!wb->congested)
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@ -1778,6 +1778,7 @@ pause:
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pause,
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start_time);
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__set_current_state(TASK_KILLABLE);
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wb->dirty_sleep = now;
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io_schedule_timeout(pause);
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current->dirty_paused_when = now + pause;
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