From: Tejun Heo <tj@kernel.org>
To: "jianchao.wang" <jianchao.w.wang@oracle.com>
Cc: axboe@kernel.dk, linux-kernel@vger.kernel.org, oleg@redhat.com,
peterz@infradead.org, kernel-team@fb.com, osandov@fb.com
Subject: Re: [PATCH 6/6] blk-mq: remove REQ_ATOM_STARTED
Date: Wed, 13 Dec 2017 08:09:13 -0800 [thread overview]
Message-ID: <20171213160913.GR3919388@devbig577.frc2.facebook.com> (raw)
In-Reply-To: <9e9452b1-5756-71fc-f7f9-2a90aceccf01@oracle.com>
Hello,
On Wed, Dec 13, 2017 at 11:05:11AM +0800, jianchao.wang wrote:
> Just don't quite understand the strict definition of "generation" you said.
> A allocation->free cycle is a generation ? or a idle->in-flight cycle is a
> generation? The idle->in-flight cycle could include the requeue case as above.
> Can you clarify this?
So, a request is
* IN_FLIGHT, if it can be completed by the lower level driver
* COMPLETE, if the lower level driver indicated completion but block
layer is still processing.
* IDLE, if neither of the above two.
and generation is bumped up on IDLE -> IN_FLIGHT to distinguish
different IN_FLIGHT instances.
Thanks.
--
tejun
next prev parent reply other threads:[~2017-12-13 16:09 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-09 19:25 [PATCHSET] blk-mq: reimplement timeout handling Tejun Heo
2017-12-09 19:25 ` [PATCH 1/6] blk-mq: protect completion path with RCU Tejun Heo
2017-12-13 3:10 ` jianchao.wang
2017-12-09 19:25 ` [PATCH 2/6] blk-mq: replace timeout synchronization with a RCU and generation based scheme Tejun Heo
2017-12-12 10:09 ` Peter Zijlstra
2017-12-12 18:02 ` Tejun Heo
2017-12-12 10:10 ` Peter Zijlstra
2017-12-12 18:03 ` Tejun Heo
2017-12-12 11:56 ` Peter Zijlstra
2017-12-12 18:04 ` Tejun Heo
2017-12-09 19:25 ` [PATCH 3/6] blk-mq: use blk_mq_rq_state() instead of testing REQ_ATOM_COMPLETE Tejun Heo
2017-12-09 19:25 ` [PATCH 4/6] blk-mq: make blk_abort_request() trigger timeout path Tejun Heo
2017-12-09 19:25 ` [PATCH 5/6] blk-mq: remove REQ_ATOM_COMPLETE usages from blk-mq Tejun Heo
2017-12-09 19:25 ` [PATCH 6/6] blk-mq: remove REQ_ATOM_STARTED Tejun Heo
2017-12-12 10:09 ` jianchao.wang
2017-12-12 17:01 ` Tejun Heo
2017-12-12 17:26 ` Tejun Heo
2017-12-13 3:05 ` jianchao.wang
2017-12-13 16:09 ` Tejun Heo [this message]
2017-12-14 2:14 ` jianchao.wang
2017-12-12 11:17 ` Nikolay Borisov
2017-12-12 17:29 ` Tejun Heo
2017-12-11 9:27 ` [PATCHSET] blk-mq: reimplement timeout handling Peter Zijlstra
2017-12-12 9:21 ` Christoph Hellwig
2017-12-12 16:39 ` Tejun Heo
2017-12-12 16:08 ` Peter Zijlstra
-- strict thread matches above, loose matches on Subject: below --
2017-12-12 19:01 [PATCHSET v2] " Tejun Heo
2017-12-12 19:01 ` [PATCH 6/6] blk-mq: remove REQ_ATOM_STARTED Tejun Heo
2017-12-12 22:20 ` Bart Van Assche
2017-12-12 22:20 ` Bart Van Assche
2017-12-12 22:22 ` tj
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