From: Jens Axboe <axboe@fb.com>
To: Christoph Hellwig <hch@lst.de>
Cc: <axboe@kernel.dk>, <linux-kernel@vger.kernel.org>,
<linux-block@vger.kernel.org>
Subject: Re: [PATCH 1/4] block: add scalable completion tracking of requests
Date: Wed, 2 Nov 2016 08:55:16 -0600 [thread overview]
Message-ID: <1954bf49-eeff-0b16-3cf9-7d7d02f25562@fb.com> (raw)
In-Reply-To: <20161102145239.GB13964@lst.de>
On 11/02/2016 08:52 AM, Christoph Hellwig 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.
>
> what is the use case for the legacy request tracking?
Buffered writeback code uses the same base. Additionally, it could
replace some user space tracking for latency outliers that people are
currently running.
--
Jens Axboe
next prev parent reply other threads:[~2016-11-02 14:55 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
2016-11-02 14:52 ` Christoph Hellwig
2016-11-02 14:55 ` Jens Axboe [this message]
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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