From: Christoph Hellwig <hch@lst.de>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Christoph Hellwig <hch@lst.de>, Sagi Grimberg <sagi@grimberg.me>,
Keith Busch <kbusch@kernel.org>, Jens Axboe <axboe@fb.com>,
Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>,
Max Gurtovoy <maxg@mellanox.com>,
Stephen Bates <sbates@raithlin.com>
Subject: Re: [PATCH v9 10/12] block: don't check blk_rq_is_passthrough() in blk_do_io_stat()
Date: Thu, 10 Oct 2019 12:05:26 +0200 [thread overview]
Message-ID: <20191010100526.GA27209@lst.de> (raw)
In-Reply-To: <20191009192530.13079-12-logang@deltatee.com>
> @@ -319,7 +319,7 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data,
> rq->cmd_flags = op;
> if (data->flags & BLK_MQ_REQ_PREEMPT)
> rq->rq_flags |= RQF_PREEMPT;
> - if (blk_queue_io_stat(data->q))
> + if (blk_queue_io_stat(data->q) && !blk_rq_is_passthrough(rq))
> rq->rq_flags |= RQF_IO_STAT;
This needs a comment why we don't account passthrough requests by
default. And I'm really curious about the answer, because I don't
know it myself.
> * a) it's attached to a gendisk, and
> * b) the queue had IO stats enabled when this request was started, and
> - * c) it's a file system request
> + * c) it's a file system request (RQF_IO_STAT will not be set otherwise)
c) should just go away now based on your changes.
> static inline bool blk_do_io_stat(struct request *rq)
> {
> return rq->rq_disk &&
> - (rq->rq_flags & RQF_IO_STAT) &&
> - !blk_rq_is_passthrough(rq);
> + (rq->rq_flags & RQF_IO_STAT);
The check can be collapsed onto a single line now.
next prev parent reply other threads:[~2019-10-10 10:05 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-09 19:25 [PATCH v9 00/12] nvmet: add target passthru commands support Logan Gunthorpe
2019-10-09 19:25 ` [PATCH v9 01/12] nvme-core: introduce nvme_ctrl_get_by_path() Logan Gunthorpe
2019-10-09 22:13 ` Keith Busch
2019-10-10 11:37 ` Christoph Hellwig
2019-10-09 19:25 ` [PATCH v9 02/12] nvme-core: export existing ctrl and ns interfaces Logan Gunthorpe
2019-10-09 22:14 ` Keith Busch
2019-10-09 19:25 ` [PATCH v9 03/12] nvmet: add return value to nvmet_add_async_event() Logan Gunthorpe
2019-10-09 22:17 ` Keith Busch
2019-10-09 19:25 ` [PATCH v9 04/12] nvmet: make nvmet_copy_ns_identifier() non-static Logan Gunthorpe
2019-10-09 22:18 ` Keith Busch
2019-10-10 11:50 ` Christoph Hellwig
2019-10-09 19:25 ` [PATCH v9 05/12] Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> [logang@deltatee.com: fixed some of the wording in the help message] Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Reviewed-by: Max Gurtovoy <maxg@mellanox.com> Logan Gunthorpe
2019-10-10 12:34 ` Christoph Hellwig
2019-10-25 23:09 ` [PATCH v9 05/12] Logan Gunthorpe
2019-10-09 19:25 ` [PATCH v9 05/12] nvmet-passthru: add passthru code to process commands Logan Gunthorpe
2019-10-09 19:25 ` [PATCH v9 06/12] nvmet-passthru: add enable/disable helpers Logan Gunthorpe
2019-10-09 19:25 ` [PATCH v9 07/12] nvmet-core: don't check the data len for pt-ctrl Logan Gunthorpe
2019-10-10 11:04 ` Christoph Hellwig
2019-10-09 19:25 ` [PATCH v9 08/12] nvmet-tcp: don't check data_len in nvmet_tcp_map_data() Logan Gunthorpe
2019-10-10 11:07 ` Christoph Hellwig
2019-10-09 19:25 ` [PATCH v9 09/12] nvmet-configfs: introduce passthru configfs interface Logan Gunthorpe
2019-10-09 19:25 ` [PATCH v9 10/12] block: don't check blk_rq_is_passthrough() in blk_do_io_stat() Logan Gunthorpe
2019-10-10 10:05 ` Christoph Hellwig [this message]
2019-10-10 17:56 ` Logan Gunthorpe
2019-10-09 19:25 ` [PATCH v9 11/12] block: call blk_account_io_start() in blk_execute_rq_nowait() Logan Gunthorpe
2019-10-10 10:06 ` Christoph Hellwig
2019-10-09 19:25 ` [PATCH v9 12/12] nvmet-passthru: support block accounting Logan Gunthorpe
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