From: Al Viro <viro@zeniv.linux.org.uk>
To: Pavel Begunkov <asml.silence@gmail.com>
Cc: linux-kernel@vger.kernel.org, Jens Axboe <axboe@kernel.dk>
Subject: Re: [RFC] exit: do exit_task_work() before shooting off mm
Date: Tue, 8 Dec 2020 01:37:22 +0000 [thread overview]
Message-ID: <20201208013722.GG3579531@ZenIV.linux.org.uk> (raw)
In-Reply-To: <abab9af4e0d26358538a45a2826650e9cefd2924.1606961931.git.asml.silence@gmail.com>
On Thu, Dec 03, 2020 at 02:30:46AM +0000, Pavel Begunkov wrote:
> Handle task works and lock it earlier before it starts killing off
> task's resources like mm. io_uring makes use of it a lot and it'd
> nicer to have all added task_work finding tasks in a consistent state.
>
> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
> ---
>
> Would it be correct? I clearly don't know all the exit invariants, but
> can't find any users relying on task_works in-between.
You've just gotten rid of exit_task_work() anywhere after exit_files().
And exit_mm() can trigger the final fput() just as easily as exit_files().
IOW, you have just made the effect of final close on exit() completely
asynchronous.
NAK.
next prev parent reply other threads:[~2020-12-08 1:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 2:30 Pavel Begunkov
2020-12-08 1:37 ` Al Viro [this message]
2020-12-08 3:00 ` Pavel Begunkov
2020-12-20 12:50 ` Pavel Begunkov
2020-12-20 13:58 ` Oleg Nesterov
2020-12-20 14:42 ` Pavel Begunkov
2020-12-14 14:51 ` [exit] 80fae08355: stderr.mount:/fs/sda1:/dev/sda1_already_mounted_or_mount_point_busy kernel test robot
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=20201208013722.GG3579531@ZenIV.linux.org.uk \
--to=viro@zeniv.linux.org.uk \
--cc=asml.silence@gmail.com \
--cc=axboe@kernel.dk \
--cc=linux-kernel@vger.kernel.org \
/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
Powered by JetHome