Note in the bdi_writeback structure if a task is currently being
limited in balance_dirty_pages(), waiting for writeback to
proceed.
Signed-off-by: Jens Axboe <axboe@xxxxxx>
---
include/linux/backing-dev-defs.h | 2 ++
mm/page-writeback.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h
index 1b4d69f68c33..f702309216b4 100644
--- a/include/linux/backing-dev-defs.h
+++ b/include/linux/backing-dev-defs.h
@@ -116,6 +116,8 @@ struct bdi_writeback {
struct list_head work_list;
struct delayed_work dwork; /* work item used for writeback */
+ int dirty_sleeping; /* waiting on dirty limit exceeded */
+
struct list_head bdi_node; /* anchored at bdi->wb_list */
#ifdef CONFIG_CGROUP_WRITEBACK
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 11ff8f758631..15e696bc5d14 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1746,7 +1746,9 @@ pause:
pause,
start_time);
__set_current_state(TASK_KILLABLE);
+ wb->dirty_sleeping = 1;
io_schedule_timeout(pause);
+ wb->dirty_sleeping = 0;
current->dirty_paused_when = now + pause;
current->nr_dirtied = 0;
--
2.8.0.rc4.6.g7e4ba36
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