linux-kernel - Re: [PATCH v3] exit: combine work under lock in synchronize_group_exit() and coredump_task

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAGudoHGzG6stVcsJRHFBhrikBFDFP+6=wRzpDoY5qFqEydksow@mail.gmail.com>
Date: Tue, 1 Apr 2025 15:05:08 +0200
From: Mateusz Guzik <mjguzik@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH v3] exit: combine work under lock in synchronize_group_exit()
 and coredump_task_exit()

I think this fell through the cracks. Can you pick it up? Should I
prod someone else?

thanks

On Wed, Mar 19, 2025 at 9:11 PM Oleg Nesterov <oleg@...hat.com> wrote:
>
> On 03/19, Mateusz Guzik wrote:
> >
> > This reduces single-threaded overhead as it avoids one lock+irq trip on
> > exit.
> >
> > It also improves scalability of spawning and killing threads within one
> > process (just shy of 5% when doing it on 24 cores on my test jig).
> >
> > Both routines are moved below kcov and kmsan exit, which should be
> > harmless.
> >
> > Signed-off-by: Mateusz Guzik <mjguzik@...il.com>
>
> Reviewed-by: Oleg Nesterov <oleg@...hat.com>
>


-- 
Mateusz Guzik <mjguzik gmail.com>