From 499d05ecf990a7a7bbf9e0a273f9969f8ec69efc Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 16 Nov 2011 19:34:48 +0800 Subject: [PATCH] mm: Make task in balance_dirty_pages() killable There is no reason why task in balance_dirty_pages() shouldn't be killable and it helps in recovering from some error conditions (like when filesystem goes in error state and cannot accept writeback anymore but we still want to kill processes using it to be able to unmount it). There will be follow up patches to further abort the generic_perform_write() and other filesystem write loops, to avoid large write + SIGKILL combination exceeding the dirty limit and possibly strange OOM. Reported-by: Kazuya Mio Tested-by: Kazuya Mio Reviewed-by: Neil Brown Reviewed-by: KOSAKI Motohiro Signed-off-by: Jan Kara Signed-off-by: Wu Fengguang --- mm/page-writeback.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index a3278f0..79c3441 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1133,7 +1133,7 @@ pause: pages_dirtied, pause, start_time); - __set_current_state(TASK_UNINTERRUPTIBLE); + __set_current_state(TASK_KILLABLE); io_schedule_timeout(pause); dirty_thresh = hard_dirty_limit(dirty_thresh); @@ -1145,6 +1145,9 @@ pause: */ if (nr_dirty < dirty_thresh) break; + + if (fatal_signal_pending(current)) + break; } if (!dirty_exceeded && bdi->dirty_exceeded) -- 2.7.4