From: Thomas Gleixner <tglx@linutronix.de>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Peter Zijlstra <peterz@infradead.org>,
Jiakai Xu <xujiakai24@mails.ucas.ac.cn>
Cc: Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
K Prateek Nayak <kprateek.nayak@amd.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] sched/mmcid: Bound the CID allocation busy wait
Date: Fri, 13 Nov 2026 15:32:09 +0100 [thread overview]
Message-ID: <87eccossye.ffs@fw13> (raw)
In-Reply-To: <bd4c03e6-7ea6-4a21-9a3e-74ea9d36fe17@efficios.com>
On Wed, Nov 11 2026 at 20:48, Mathieu Desnoyers wrote:
> On Tue, Oct 20 2026 at 15:54, Thomas Gleixner wrote:
> I have a reproducer for a lockup that starts from the stale state you
> describe. It needs two more things: the execve() fails, and the task is
> moved to another CPU during that execve().
That has been reported already privately to me and a few others and the
reporter provided a similar patch as you.
While both variants seem simpler, I prefer the explicit
re-initialization for the failed exec() case.
It's a NOOP for newly initialized MMs and avoids the pointless fixup
dance for the last user in the common case.
Thanks,
tglx
next prev parent reply other threads:[~2026-11-13 14:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-18 1:34 Jiakai Xu
2026-09-18 10:43 ` Peter Zijlstra
2026-10-15 20:37 ` Thomas Gleixner
2026-10-20 13:54 ` Thomas Gleixner
2026-10-21 1:30 ` Jiakai Xu
2026-11-12 1:48 ` Mathieu Desnoyers
2026-11-13 14:32 ` Thomas Gleixner [this message]
2026-11-13 14:52 ` Mathieu Desnoyers
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=87eccossye.ffs@fw13 \
--to=tglx@linutronix.de \
--cc=bsegall@google.com \
--cc=dietmar.eggemann@arm.com \
--cc=juri.lelli@redhat.com \
--cc=kprateek.nayak@amd.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mathieu.desnoyers@efficios.com \
--cc=mgorman@suse.de \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=vincent.guittot@linaro.org \
--cc=vschneid@redhat.com \
--cc=xujiakai24@mails.ucas.ac.cn \
/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
all inboxes | Powered by JetHome®