The patch titled
Subject: mm/page_io.c: use blk_io_schedule() for avoiding task hung in sync io
has been added to the -mm tree. Its filename is
mm-use-blk_io_schedule-for-avoiding-task-hung-in-sync-io.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-use-blk_io_schedule-for-avoiding-task-hung-in-sync-io.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-use-blk_io_schedule-for-avoiding-task-hung-in-sync-io.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Xianting Tian <xianting_tian@xxxxxxx>
Subject: mm/page_io.c: use blk_io_schedule() for avoiding task hung in sync io
swap_readpage() does the sync io for one page, the io is not big,
normally, the io can be finished quickly, but it may take long time or
wait forever in case of io failure or discard.
This patch uses blk_io_schedule() instead of io_schedule() to avoid task
hung and crash (when set /proc/sys/kernel/hung_task_panic) when the above
exception occurs.
This is similar to the hung task avoidance in submit_bio_wait(),
blk_execute_rq() and __blkdev_direct_IO().
Link: http://lkml.kernel.org/r/1596461807-21087-1-git-send-email-xianting_tian@xxxxxxx
Signed-off-by: Xianting Tian <xianting_tian@xxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Bart Van Assche <bvanassche@xxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_io.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/page_io.c~mm-use-blk_io_schedule-for-avoiding-task-hung-in-sync-io
+++ a/mm/page_io.c
@@ -441,7 +441,7 @@ int swap_readpage(struct page *page, boo
break;
if (!blk_poll(disk->queue, qc, true))
- io_schedule();
+ blk_io_schedule();
}
__set_current_state(TASK_RUNNING);
bio_put(bio);
_
Patches currently in -mm which might be from xianting_tian@xxxxxxx are
mm-use-blk_io_schedule-for-avoiding-task-hung-in-sync-io.patch
