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| author | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2010-07-25 14:29:15 +0300 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2010-08-07 18:53:55 +0200 |
| commit | 297252c81de8043ca6c36e5984c24fdb5aab9013 (patch) | |
| tree | d94a35abcd3b227b072955622f703a2cdc3c309d /fs/fs-writeback.c | |
| parent | c4ec7908c2c5125f75fabd100e7a95626a6883ee (diff) | |
| download | lwn-297252c81de8043ca6c36e5984c24fdb5aab9013.tar.gz lwn-297252c81de8043ca6c36e5984c24fdb5aab9013.zip | |
writeback: do not lose wake-ups in bdi threads
Currently, bdi threads ('bdi_writeback_thread()') can lose wake-ups. For
example, if 'bdi_queue_work()' is executed after the bdi thread have had
finished 'wb_do_writeback()' but before it called
'schedule_timeout_interruptible()'.
To fix this issue, we have to check whether we have works to process after we
have changed the task state to 'TASK_INTERRUPTIBLE'.
This patch also clean-ups handling of the cases when 'dirty_writeback_interval'
is zero or non-zero.
Additionally, this patch also removes unneeded 'list_empty_careful()' call.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'fs/fs-writeback.c')
| -rw-r--r-- | fs/fs-writeback.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 002be0ff2ab3..05444eaa3f36 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -848,17 +848,18 @@ int bdi_writeback_thread(void *data) break; } - if (dirty_writeback_interval) { - wait_jiffies = msecs_to_jiffies(dirty_writeback_interval * 10); - schedule_timeout_interruptible(wait_jiffies); - } else { - set_current_state(TASK_INTERRUPTIBLE); - if (list_empty_careful(&wb->bdi->work_list) && - !kthread_should_stop()) - schedule(); + set_current_state(TASK_INTERRUPTIBLE); + if (!list_empty(&bdi->work_list)) { __set_current_state(TASK_RUNNING); + continue; } + if (dirty_writeback_interval) { + wait_jiffies = msecs_to_jiffies(dirty_writeback_interval * 10); + schedule_timeout(wait_jiffies); + } else + schedule(); + try_to_freeze(); } |