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[4/8] writeback: track if we're sleeping on progress in balance_dirty_pages()

Message ID 1458746750-9213-5-git-send-email-axboe@fb.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jens Axboe March 23, 2016, 3:25 p.m. UTC 
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@fb.com>
---
 include/linux/backing-dev-defs.h | 2 ++
 mm/page-writeback.c              | 2 ++
 2 files changed, 4 insertions(+)
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Patch

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;