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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

  reply	other threads:[~2017-12-13 16:09 UTC|newest]

Thread overview: 29+ 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
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 22:22     ` tj

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