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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().

Signed-off-by: Xianting Tian <xianting_tian@126.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Hugh Dickins <hughd@google.com>
Link: http://lkml.kernel.org/r/1596461807-21087-1-git-send-email-xianting_tian@126.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
zero-sugar-mainline-defconfig
Xianting Tian 2020-08-06 23:20:17 -07:00 committed by Linus Torvalds
parent 27ec4878df
commit 0f190a7ab7
1 changed files with 1 additions and 1 deletions
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mm/page_io.c
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@ -441,7 +441,7 @@ int swap_readpage(struct page *page, bool synchronous)
break;
if (!blk_poll(disk->queue, qc, true))
io_schedule();
blk_io_schedule();
}
__set_current_state(TASK_RUNNING);
bio_put(bio);