diff options
| author | Yunlei He <heyunlei@huawei.com> | 2016-02-23 12:07:56 +0800 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-04-13 12:33:08 +0200 |
| commit | 09635f3b8f7614254c0ce9f51a56cc0e29c4761d (patch) | |
| tree | 56864c9ecfff631ab20a7c8283fbe1b78c57b0d9 /kernel | |
| parent | c173fa4f4ca710bf5aae9d70b1fcb7e7595a06d9 (diff) | |
f2fs: avoid hungtask problem caused by losing wake_up
The D state of wait_on_all_pages_writeback should be waken by
function f2fs_write_end_io when all writeback pages have been
succesfully written to device. It's possible that wake_up comes
between get_pages and io_schedule. Maybe in this case it will
lost wake_up and still in D state even if all pages have been
write back to device, and finally, the whole system will be into
the hungtask state.
if (!get_pages(sbi, F2FS_WRITEBACK))
break;
<--------- wake_up
io_schedule();
Signed-off-by: Yunlei He <heyunlei@huawei.com>
Signed-off-by: Biao He <hebiao6@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 19d98e5f1..007e48eee 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5088,6 +5088,7 @@ long __sched io_schedule_timeout(long timeout) delayacct_blkio_end(); return ret; } +EXPORT_SYMBOL(io_schedule_timeout); /** * sys_sched_get_priority_max - return maximum RT priority. |