From: Christoph Hellwig <hch@lst.de>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, Bart Van Assche <bvanassche@acm.org>,
Hannes Reinecke <hare@suse.com>, Christoph Hellwig <hch@lst.de>,
Thomas Gleixner <tglx@linutronix.de>,
John Garry <john.garry@huawei.com>
Subject: Re: [PATCH V11 05/12] blk-mq: add blk_mq_all_tag_iter
Date: Wed, 13 May 2020 13:56:38 +0200 [thread overview]
Message-ID: <20200513115638.GA6297@lst.de> (raw)
In-Reply-To: <20200513034803.1844579-6-ming.lei@redhat.com>
On Wed, May 13, 2020 at 11:47:56AM +0800, Ming Lei wrote:
> Now request is thought as in-flight only when its state is updated as
> MQ_RQ_IN_FLIGHT, which is done by driver via blk_mq_start_request().
This should probably mention who considers it it in flight.
> Actually from blk-mq's view, one rq can be thought as in-flight
> after its tag is >= 0.
> Add one new function of blk_mq_all_tag_iter so that we can iterate
> every in-flight request, and this way is more flexible since caller
> can decide to handle request according to rq's state.
Maybe I'd reword the whole commit log as:
"Add a new blk_mq_all_tag_iter that iterates all requets which have a tag
assigned to them. This is more flexible than the existing iterator
iterator as it allows the caller to check the request state and act
upon it."
Otherwise looks good:
Reviewed-by: Christoph Hellwig <hch@lst.de>
next prev parent reply other threads:[~2020-05-13 11:56 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-13 3:47 [PATCH V11 00/12] blk-mq: improvement CPU hotplug Ming Lei
2020-05-13 3:47 ` [PATCH V11 01/12] block: clone nr_integrity_segments and write_hint in blk_rq_prep_clone Ming Lei
2020-05-13 3:47 ` [PATCH V11 02/12] block: add helper for copying request Ming Lei
2020-05-13 3:47 ` [PATCH V11 03/12] blk-mq: mark blk_mq_get_driver_tag as static Ming Lei
2020-05-13 3:47 ` [PATCH V11 04/12] blk-mq: assign rq->tag in blk_mq_get_driver_tag Ming Lei
2020-05-13 3:47 ` [PATCH V11 05/12] blk-mq: add blk_mq_all_tag_iter Ming Lei
2020-05-13 11:56 ` Christoph Hellwig [this message]
2020-05-13 3:47 ` [PATCH V11 06/12] blk-mq: prepare for draining IO when hctx's all CPUs are offline Ming Lei
2020-05-13 6:35 ` Hannes Reinecke
2020-05-13 11:58 ` Christoph Hellwig
2020-05-14 0:33 ` Ming Lei
2020-05-13 3:47 ` [PATCH V11 07/12] blk-mq: stop to handle IO and drain IO before hctx becomes inactive Ming Lei
2020-05-13 11:59 ` Christoph Hellwig
2020-05-14 0:36 ` Ming Lei
2020-05-14 1:12 ` Bart Van Assche
2020-05-14 3:10 ` Ming Lei
2020-05-13 3:47 ` [PATCH V11 08/12] block: add blk_end_flush_machinery Ming Lei
2020-05-13 12:00 ` Christoph Hellwig
2020-05-13 3:48 ` [PATCH V11 09/12] blk-mq: add blk_mq_hctx_handle_dead_cpu for handling cpu dead Ming Lei
2020-05-13 12:06 ` Christoph Hellwig
2020-05-13 3:48 ` [PATCH V11 10/12] block: add request allocation flag of BLK_MQ_REQ_FORCE Ming Lei
2020-05-13 10:34 ` [PATCH V12 " Ming Lei
2020-05-13 3:48 ` [PATCH V11 11/12] blk-mq: re-submit IO in case that hctx is inactive Ming Lei
2020-05-13 9:21 ` John Garry
2020-05-13 12:21 ` Christoph Hellwig
2020-05-13 15:03 ` Bart Van Assche
2020-05-14 0:45 ` Ming Lei
2020-05-14 0:40 ` Ming Lei
2020-05-13 3:48 ` [PATCH V11 12/12] block: deactivate hctx when the hctx is actually inactive Ming Lei
2020-05-13 7:34 ` [PATCH V11 00/12] blk-mq: improvement CPU hotplug John Garry
2020-05-13 10:37 ` Ming Lei
2020-05-13 11:33 ` John Garry
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