From: Jens Axboe <axboe@kernel.dk>
To: Johannes Thumshirn <jthumshirn@suse.de>
Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, hch@lst.de
Subject: Re: [PATCH 1/4] block: add scalable completion tracking of requests
Date: Tue, 1 Nov 2016 23:37:34 -0600 [thread overview]
Message-ID: <20161102053734.GA1317@kernel.dk> (raw)
In-Reply-To: <20161101222550.u64m4txqjgoohwbv@linux-x5ow.site>
On Tue, Nov 01 2016, Johannes Thumshirn wrote:
> On Tue, Nov 01, 2016 at 03:05:22PM -0600, Jens Axboe wrote:
> > 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.
> >
> > Signed-off-by: Jens Axboe <axboe@fb.com>
> > ---
>
> [...]
>
> >
> > /* incremented at completion time */
> > unsigned long ____cacheline_aligned_in_smp rq_completed[2];
> > + struct blk_rq_stat stat[2];
>
> Can you add an enum or define for the directions? Just 0 and 1 aren't very
> intuitive.
Good point, I added that and updated both the stats patch and the
subsequent blk-mq poll code.
--
Jens Axboe
next prev parent reply other threads:[~2016-11-02 5:37 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-01 21:05 [PATCHSET] block: IO polling improvements Jens Axboe
2016-11-01 21:05 ` [PATCH 1/4] block: add scalable completion tracking of requests Jens Axboe
2016-11-01 22:25 ` Johannes Thumshirn
2016-11-02 5:37 ` Jens Axboe [this message]
2016-11-02 14:52 ` Christoph Hellwig
2016-11-02 14:55 ` Jens Axboe
2016-11-02 14:59 ` Christoph Hellwig
2016-11-03 11:17 ` Ming Lei
2016-11-03 13:38 ` Jens Axboe
2016-11-03 14:57 ` Ming Lei
2016-11-03 16:55 ` Jens Axboe
2016-11-04 23:13 ` Ming Lei
2016-11-05 20:49 ` Jens Axboe
2016-11-05 20:59 ` Jens Axboe
2016-11-03 14:10 ` Bart Van Assche
2016-11-03 14:18 ` Jens Axboe
2016-11-01 21:05 ` [PATCH 2/4] block: move poll code to blk-mq Jens Axboe
2016-11-02 14:54 ` Christoph Hellwig
2016-11-01 21:05 ` [PATCH 3/4] blk-mq: implement hybrid poll mode for sync O_DIRECT Jens Axboe
2016-11-02 14:54 ` Christoph Hellwig
2016-11-03 12:27 ` Ming Lei
2016-11-03 13:41 ` Jens Axboe
2016-11-03 14:01 ` Bart Van Assche
2016-11-03 14:15 ` Jens Axboe
2016-11-01 21:05 ` [PATCH 4/4] blk-mq: make the polling code adaptive Jens Axboe
2016-11-02 14:51 ` [PATCHSET] block: IO polling improvements Christoph Hellwig
2016-11-02 14:54 ` Jens Axboe
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