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Commit b57d74af authored by Jens Axboe's avatar Jens Axboe
Browse files

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: default avatarJens Axboe <axboe@fb.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
parent 8e1de26c

include/linux/backing-dev-defs.h

+2 −0
Original line number Diff line number Diff line
@@ -116,6 +116,8 @@ struct bdi_writeback { 
	struct list_head work_list;

	struct delayed_work dwork;	/* work item used for writeback */



	unsigned long dirty_sleep;	/* last wait */



	struct list_head bdi_node;	/* anchored at bdi->wb_list */



#ifdef CONFIG_CGROUP_WRITEBACK

mm/backing-dev.c

+1 −0
Original line number Diff line number Diff line
@@ -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)

mm/page-writeback.c

+1 −0
Original line number Diff line number Diff line
@@ -1778,6 +1778,7 @@ static void balance_dirty_pages(struct address_space *mapping, 
					  pause,

					  start_time);

		__set_current_state(TASK_KILLABLE);

		wb->dirty_sleep = now;

		io_schedule_timeout(pause);



		current->dirty_paused_when = now + pause;