public inbox for [email protected]
 help / color / mirror / Atom feed
From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH v3 5.12 0/6] remove task file notes
Date: Fri,  5 Mar 2021 12:58:35 +0000	[thread overview]
Message-ID: <[email protected]> (raw)

Introduce a mapping from ctx to all tctx, and using that removes
file notes, i.e. taking a io_uring file note previously stored in
task->io_uring->xa. It's needed because we don't free io_uring ctx
until all submitters die/exec, and it became worse after killing
 ->flush(). There are rough corner in a form of not behaving nicely,
I'll address in follow-up patches.

The torture is as simple as below. It will get OOM in no time. Also,
I plan to use it to fix recently broken cancellations.

while (1) {
	assert(!io_uring_queue_init(8, &ring, 0));
	io_uring_queue_exit(&ring);
}

v2: rebase (resolve conflicts)
    drop taken 2 patches
v3: use jiffies in 6/6 (Jens)

Pavel Begunkov (6):
  io_uring: make del_task_file more forgiving
  io_uring: introduce ctx to tctx back map
  io_uring: do ctx initiated file note removal
  io_uring: don't take task ring-file notes
  io_uring: index io_uring->xa by ctx not file
  io_uring: warn when ring exit takes too long

 fs/io_uring.c            | 131 +++++++++++++++++++++++++++++++--------
 include/linux/io_uring.h |   2 +-
 2 files changed, 106 insertions(+), 27 deletions(-)

-- 
2.24.0


             reply	other threads:[~2021-03-05 13:03 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-05 12:58 Pavel Begunkov [this message]
2021-03-05 12:58 ` [PATCH v3 1/6] io_uring: make del_task_file more forgiving Pavel Begunkov
2021-03-05 12:58 ` [PATCH v3 2/6] io_uring: introduce ctx to tctx back map Pavel Begunkov
2021-03-05 12:58 ` [PATCH v3 3/6] io_uring: do ctx initiated file note removal Pavel Begunkov
2021-03-05 12:58 ` [PATCH v3 4/6] io_uring: don't take task ring-file notes Pavel Begunkov
2021-03-05 12:58 ` [PATCH v3 5/6] io_uring: index io_uring->xa by ctx not file Pavel Begunkov
2021-03-05 12:58 ` [PATCH v3 6/6] io_uring: warn when ring exit takes too long Pavel Begunkov

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 \
    [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