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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
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
include/linux/backing-dev-defs.h
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@ -116,6 +116,8 @@ struct bdi_writeback {
struct list_head work_list; struct list_head work_list;
struct delayed_work dwork; /* work item used for writeback */ 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 */ struct list_head bdi_node; /* anchored at bdi->wb_list */
#ifdef CONFIG_CGROUP_WRITEBACK #ifdef CONFIG_CGROUP_WRITEBACK

1
mm/backing-dev.c
View file

@ -310,6 +310,7 @@ static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi,
spin_lock_init(&wb->work_lock); spin_lock_init(&wb->work_lock);
INIT_LIST_HEAD(&wb->work_list); INIT_LIST_HEAD(&wb->work_list);
INIT_DELAYED_WORK(&wb->dwork, wb_workfn); INIT_DELAYED_WORK(&wb->dwork, wb_workfn);
wb->dirty_sleep = jiffies;
wb->congested = wb_congested_get_create(bdi, blkcg_id, gfp); wb->congested = wb_congested_get_create(bdi, blkcg_id, gfp);
if (!wb->congested) if (!wb->congested)

1
mm/page-writeback.c
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@ -1778,6 +1778,7 @@ static void balance_dirty_pages(struct address_space *mapping,
pause, pause,
start_time); start_time);
__set_current_state(TASK_KILLABLE); __set_current_state(TASK_KILLABLE);
wb->dirty_sleep = now;
io_schedule_timeout(pause); io_schedule_timeout(pause);
current->dirty_paused_when = now + pause; current->dirty_paused_when = now + pause;