From: Logan Gunthorpe <logang@deltatee.com>
To: Sagi Grimberg <sagi@grimberg.me>,
linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org
Cc: Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>,
Stephen Bates <sbates@raithlin.com>, Jens Axboe <axboe@fb.com>,
Keith Busch <kbusch@kernel.org>, Max Gurtovoy <maxg@mellanox.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v8 13/13] nvmet-passthru: support block accounting
Date: Mon, 9 Sep 2019 13:32:56 -0600 [thread overview]
Message-ID: <b23c72b2-c9db-cb8e-5519-63eb195b7fd4@deltatee.com> (raw)
In-Reply-To: <7954e8a4-6026-2210-7192-94a4e483facf@grimberg.me>
On 2019-09-09 1:26 p.m., Sagi Grimberg wrote:
>
>>>> Support block disk accounting by setting the RQF_IO_STAT flag
>>>> and gendisk in the request.
>>>>
>>>> After this change, IO counts will be reflected correctly in
>>>> /proc/diskstats for drives being used by passthru.
>>>>
>>>> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
>>>> ---
>>>> drivers/nvme/target/io-cmd-passthru.c | 5 ++++-
>>>> 1 file changed, 4 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/nvme/target/io-cmd-passthru.c b/drivers/nvme/target/io-cmd-passthru.c
>>>> index 7557927a3451..63f12750a80d 100644
>>>> --- a/drivers/nvme/target/io-cmd-passthru.c
>>>> +++ b/drivers/nvme/target/io-cmd-passthru.c
>>>> @@ -410,6 +410,9 @@ static struct request *nvmet_passthru_blk_make_request(struct nvmet_req *req,
>>>> if (unlikely(IS_ERR(rq)))
>>>> return rq;
>>>>
>>>> + if (blk_queue_io_stat(q) && cmd->common.opcode != nvme_cmd_flush)
>>>> + rq->rq_flags |= RQF_IO_STAT;
>>
>> Thanks for the review!
>>
>>> Does flush has data bytes in the request? Why the special casing?
>>
>> Well it was special cased in the vanilla blk account flow... But I think
>> it's required to be special cased so the IO and in_flight counts don't
>> count flushes (as they do not for regular block device traffic).
>
> I think that the accounting exclude I/O that is yielded from the flush
> sequence. Don't think its relevant here...
What? Per blk_account_io_done(), RQF_FLUSH_SEQ will not be set by us for
passthru commands and I don't think it's appropriate to do so. Thus, if
we set RQF_IO_STAT for passthru flush commands, they will be counted
which we do not want.
Logan
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next prev parent reply other threads:[~2019-09-09 19:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190828215429.4572-1-logang@deltatee.com>
[not found] ` <20190828215429.4572-2-logang@deltatee.com>
2019-09-06 23:33 ` [PATCH v8 01/13] nvme-core: introduce nvme_ctrl_get_by_path() Sagi Grimberg
[not found] ` <20190828215429.4572-3-logang@deltatee.com>
2019-09-06 23:33 ` [PATCH v8 02/13] nvme-core: export existing ctrl and ns interfaces Sagi Grimberg
[not found] ` <20190828215429.4572-4-logang@deltatee.com>
2019-09-06 23:34 ` [PATCH v8 03/13] nvmet: add return value to nvmet_add_async_event() Sagi Grimberg
[not found] ` <20190828215429.4572-5-logang@deltatee.com>
2019-09-06 23:34 ` [PATCH v8 04/13] nvmet: make nvmet_copy_ns_identifier() non-static Sagi Grimberg
[not found] ` <20190828215429.4572-6-logang@deltatee.com>
2019-09-06 23:35 ` [PATCH v8 05/13] nvmet-passthru: update KConfig with config passthru option Sagi Grimberg
[not found] ` <20190828215429.4572-9-logang@deltatee.com>
2019-09-06 23:38 ` [PATCH v8 08/13] nvmet-core: don't check the data len for pt-ctrl Sagi Grimberg
[not found] ` <20190828215429.4572-10-logang@deltatee.com>
2019-09-06 23:39 ` [PATCH v8 09/13] nvmet-tcp: don't check data_len in nvmet_tcp_map_data() Sagi Grimberg
[not found] ` <20190828215429.4572-11-logang@deltatee.com>
2019-09-06 23:39 ` [PATCH v8 10/13] nvmet-configfs: introduce passthru configfs interface Sagi Grimberg
[not found] ` <20190828215429.4572-12-logang@deltatee.com>
2019-09-06 23:40 ` [PATCH v8 11/13] block: don't check blk_rq_is_passthrough() in blk_do_io_stat() Sagi Grimberg
[not found] ` <20190828215429.4572-13-logang@deltatee.com>
2019-09-06 23:41 ` [PATCH v8 12/13] block: call blk_account_io_start() in blk_execute_rq_nowait() Sagi Grimberg
[not found] ` <20190828215429.4572-14-logang@deltatee.com>
2019-09-07 0:00 ` [PATCH v8 13/13] nvmet-passthru: support block accounting Sagi Grimberg
2019-09-09 16:06 ` Logan Gunthorpe
2019-09-09 19:26 ` Sagi Grimberg
2019-09-09 19:32 ` Logan Gunthorpe [this message]
2019-09-09 23:15 ` Sagi Grimberg
2019-09-11 16:53 ` Logan Gunthorpe
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