linux.git - Linux kernel mainline tree

	Commit message (Collapse)	Author	Age	Files	Lines
*	blk-stat: fix a few cases of missing batch flushing	Jens Axboe	2016-12-09	1	-0/+8
\| \| \| \| \| \| \| \|	Everytime we need to read ->nr_samples, we should have flushed the batch first. The non-mq read path also needs to flush the batch. Signed-off-by: Jens Axboe <axboe@fb.com>
*	blk-stat: fix a typo	Shaohua Li	2016-12-02	1	-1/+1
\| \| \| \| \| \|	Signed-off-by: Shaohua Li <shli@fb.com> Fixes: cf43e6be865a ("block: add scalable completion tracking of requests") Signed-off-by: Jens Axboe <axboe@fb.com>
*	block: add scalable completion tracking of requests	Jens Axboe	2016-11-10	1	-0/+248
	For legacy block, we simply track them in the request queue. For blk-mq, we track them on a per-sw queue basis, which we can then sum up through the hardware queues and finally to a per device state. The stats are tracked in, roughly, 0.1s interval windows. Add sysfs files to display the stats. The feature is off by default, to avoid any extra overhead. In-kernel users of it can turn it on by setting QUEUE_FLAG_STATS in the queue flags. We currently don't turn it on if someone just reads any of the stats files, that is something we could add as well. Signed-off-by: Jens Axboe <axboe@fb.com>