From: Christoph Hellwig <hch@lst.de>
To: Ming Lei <ming.lei@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-scsi@vger.kernel.org
Subject: Re: [PATCH V2 05/13] block: only account passthrough IO from userspace
Date: Wed, 26 Jan 2022 09:10:52 +0100 [thread overview]
Message-ID: <20220126081052.GA23154@lst.de> (raw)
In-Reply-To: <YfD2YNRf+lhe5BcU@T590>
On Wed, Jan 26, 2022 at 03:21:04PM +0800, Ming Lei wrote:
> > I think the right way would be to just remove this branch entirely.
> > This means we only account bios with a block_device, which implies
> > they have a gendisk.
>
> That will not account userspace IO, and people may complain.
>
> We can just account passthrough request from userspace by the patch
> in my last email.
Let's take a step back: what I/O do we want to account, and how
do we want to archive that?
Assuming accounting is enabled:
- current mainline accounts all I/O one queues that have a gendisk
- your original patch accounts file system I/O and some passthrough I/O
that has a special flag set
Dropping the conditional to grab a bdev from the queue leaves us with
the following rule:
- all I/O that has a bio and bdev is accounted. This requires
passthrough I/O to explicitly set the bdev in case we haven't
done so, and it requires them to have a bio at all
I guess you are worried about the latter conditionin that we stop
accounting for no data transfer passthrough commands?
next prev parent reply other threads:[~2022-01-26 8:10 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-22 11:10 [PATCH V2 00/13] block: don't drain file system I/O on del_gendisk Ming Lei
2022-01-22 11:10 ` [PATCH V2 01/13] block: declare blkcg_[init|exit]_queue in private header Ming Lei
2022-01-24 12:59 ` Christoph Hellwig
2022-01-22 11:10 ` [PATCH V2 02/13] block: move initialization of q->blkg_list into blkcg_init_queue Ming Lei
2022-01-24 13:00 ` Christoph Hellwig
2022-01-24 18:32 ` Bart Van Assche
2022-01-22 11:10 ` [PATCH V2 03/13] block: move blkcg initialization/destroy into disk allocation/release handler Ming Lei
2022-01-24 13:02 ` Christoph Hellwig
2022-01-22 11:10 ` [PATCH V2 04/13] block/wbt: fix negative inflight counter when remove scsi device Ming Lei
2022-02-17 7:45 ` Christoph Hellwig
2022-02-17 14:53 ` Jens Axboe
2022-01-22 11:10 ` [PATCH V2 05/13] block: only account passthrough IO from userspace Ming Lei
2022-01-24 13:05 ` Christoph Hellwig
2022-01-24 23:09 ` Ming Lei
2022-01-25 6:16 ` Christoph Hellwig
2022-01-25 7:19 ` Christoph Hellwig
2022-01-25 8:35 ` Ming Lei
2022-01-25 9:09 ` Ming Lei
2022-01-26 5:50 ` Christoph Hellwig
2022-01-26 7:21 ` Ming Lei
2022-01-26 8:10 ` Christoph Hellwig [this message]
2022-01-26 8:33 ` Ming Lei
2022-01-26 8:49 ` Christoph Hellwig
2022-01-26 9:59 ` Ming Lei
2022-01-26 16:37 ` Christoph Hellwig
2022-01-22 11:10 ` [PATCH V2 06/13] block: don't remove hctx debugfs dir from blk_mq_exit_queue Ming Lei
2022-01-24 13:06 ` Christoph Hellwig
2022-01-22 11:10 ` [PATCH V2 07/13] block: move q_usage_counter release into blk_queue_release Ming Lei
2022-01-24 13:09 ` Christoph Hellwig
2022-01-24 19:06 ` Bart Van Assche
2022-01-22 11:10 ` [PATCH V2 08/13] block: export __blk_mq_unfreeze_queue Ming Lei
2022-01-24 13:11 ` Christoph Hellwig
2022-01-22 11:10 ` [PATCH V2 09/13] scsi: force unfreezing queue into atomic mode Ming Lei
2022-01-24 13:15 ` Christoph Hellwig
2022-01-24 23:21 ` Ming Lei
2022-01-25 7:27 ` Christoph Hellwig
2022-01-25 8:54 ` Ming Lei
2022-01-26 8:15 ` Christoph Hellwig
2022-01-22 11:10 ` [PATCH V2 10/13] block: add helper of disk_release_queue for release queue data for disk Ming Lei
2022-01-24 13:16 ` Christoph Hellwig
2022-01-24 23:27 ` Ming Lei
2022-01-25 6:17 ` Christoph Hellwig
2022-01-22 11:10 ` [PATCH V2 11/13] block: move blk_exit_queue into disk_release Ming Lei
2022-01-24 13:22 ` Christoph Hellwig
2022-01-24 23:38 ` Ming Lei
2022-01-22 11:10 ` [PATCH V2 12/13] block: move rq_qos_exit() into disk_release() Ming Lei
2022-01-24 13:28 ` Christoph Hellwig
2022-01-22 11:10 ` [PATCH V2 13/13] block: don't drain file system I/O on del_gendisk Ming Lei
2022-01-24 13:39 ` Christoph Hellwig
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220126081052.GA23154@lst.de \
--to=hch@lst.de \
--cc=axboe@kernel.dk \
--cc=linux-block@vger.kernel.org \
--cc=linux-nvme@lists.infradead.org \
--cc=linux-scsi@vger.kernel.org \
--cc=martin.petersen@oracle.com \
--cc=ming.lei@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).