From: Ming Lei <[email protected]>
To: Christoph Hellwig <[email protected]>
Cc: Kanchan Joshi <[email protected]>,
[email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected], [email protected],
[email protected], [email protected]
Subject: Re: [PATCH v5 2/6] block: wire-up support for passthrough plugging
Date: Thu, 12 May 2022 16:44:28 +0800 [thread overview]
Message-ID: <YnzI7CgI+KOHNKPb@T590> (raw)
In-Reply-To: <[email protected]>
On Thu, May 12, 2022 at 10:09:12AM +0200, Christoph Hellwig wrote:
> On Thu, May 12, 2022 at 01:25:24PM +0800, Ming Lei wrote:
> > This way may cause nested plugging, and breaks xfstests generic/131.
> > Also may cause io hang since request can't be polled before flushing
> > plug in blk_execute_rq().
>
> Looking at this again, yes blk_mq_request_bypass_insert is probably the
> wrong place.
>
> > I'd suggest to apply the plug in blk_execute_rq_nowait(), such as:
>
> Do we really need the use_plug parameter and the extra helper? If
> someone holds a plug over passthrough command submission I think
> we can assume they actually do want to use it. Otherwise this does
> indeed look like the better plan.
use_plug is just for avoiding hang in blk_rq_poll_completion(), so
I think we can bypass plug if one polled rq is executed inside
blk_execute_rq().
Thanks,
Ming
next prev parent reply other threads:[~2022-05-12 8:44 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20220511055306epcas5p3bf3b4c1e32d2bb43db12785bd7caf5da@epcas5p3.samsung.com>
2022-05-11 5:47 ` [PATCH v5 0/6] io_uring passthrough for nvme Kanchan Joshi
[not found] ` <CGME20220511055308epcas5p3627bcb0ec10d7a2222e701898e9ad0db@epcas5p3.samsung.com>
2022-05-11 5:47 ` [PATCH v5 1/6] fs,io_uring: add infrastructure for uring-cmd Kanchan Joshi
2022-05-11 12:42 ` Christoph Hellwig
[not found] ` <CGME20220511055310epcas5p46650f5b6fe963279f686b8f50a98a286@epcas5p4.samsung.com>
2022-05-11 5:47 ` [PATCH v5 2/6] block: wire-up support for passthrough plugging Kanchan Joshi
2022-05-12 5:25 ` Ming Lei
2022-05-12 8:09 ` Christoph Hellwig
2022-05-12 8:44 ` Ming Lei [this message]
2022-05-12 12:31 ` Jens Axboe
2022-05-12 11:50 ` Anuj Gupta
2022-05-12 14:06 ` Ming Lei
[not found] ` <CGME20220511055312epcas5p3b1e9989a32cb1a79f8a941476fc433d1@epcas5p3.samsung.com>
2022-05-11 5:47 ` [PATCH v5 3/6] nvme: refactor nvme_submit_user_cmd() Kanchan Joshi
[not found] ` <CGME20220511055314epcas5p42ddbc17608f2677814c07b0d790e1318@epcas5p4.samsung.com>
2022-05-11 5:47 ` [PATCH v5 4/6] nvme: wire-up uring-cmd support for io-passthru on char-device Kanchan Joshi
[not found] ` <CGME20220511055319epcas5p1d78cb03bd1b145a6d58c8e616795af14@epcas5p1.samsung.com>
2022-05-11 5:47 ` [PATCH v5 5/6] nvme: add vectored-io support for uring-cmd Kanchan Joshi
[not found] ` <CGME20220511055320epcas5p2457aaf8e7405387282f60831f5a4eca9@epcas5p2.samsung.com>
2022-05-11 5:47 ` [PATCH v5 6/6] io_uring: finish IOPOLL/ioprio prep handler removal Kanchan Joshi
2022-05-11 6:54 ` Christoph Hellwig
2022-05-11 11:05 ` Kanchan Joshi
2022-05-11 12:38 ` Jens Axboe
2022-05-11 12:39 ` [PATCH v5 0/6] io_uring passthrough for nvme Jens Axboe
2022-05-11 13:14 ` Kanchan Joshi
2022-05-11 13:39 ` Jens Axboe
2022-05-11 13:48 ` Jens Axboe
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=YnzI7CgI+KOHNKPb@T590 \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
[email protected] \
/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