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mm: Make task in balance_dirty_pages() killable

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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 <k-mio@sx.jp.nec.com>
Tested-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
This commit is contained in:
Jan Kara 2011-11-16 19:34:48 +08:00 committed by Wu Fengguang
parent 6aaf05f472
commit 499d05ecf9
1 changed files with 4 additions and 1 deletions
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5
mm/page-writeback.c
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@ -1133,7 +1133,7 @@ static void balance_dirty_pages(struct address_space *mapping,
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 @@ static void balance_dirty_pages(struct address_space *mapping,
*/
if (nr_dirty < dirty_thresh)
break;
if (fatal_signal_pending(current))
break;
}
if (!dirty_exceeded && bdi->dirty_exceeded)