linux-kernel - Re: [PATCH] core_pattern: add CPU specifier

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Message-ID: <20220903072018.GA15331@redhat.com>
Date:   Sat, 3 Sep 2022 09:20:19 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Oleksandr Natalenko <oleksandr@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Huang Ying <ying.huang@...el.com>,
        "Jason A . Donenfeld" <Jason@...c4.com>,
        Will Deacon <will@...nel.org>,
        "Guilherme G . Piccoli" <gpiccoli@...lia.com>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Stephen Kitt <steve@....org>, Rob Herring <robh@...nel.org>,
        Joel Savitz <jsavitz@...hat.com>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Xiaoming Ni <nixiaoming@...wei.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Renaud Métrich <rmetrich@...hat.com>,
        Grzegorz Halat <ghalat@...hat.com>, Qi Guo <qguo@...hat.com>
Subject: Re: [PATCH] core_pattern: add CPU specifier

On 09/03, Oleksandr Natalenko wrote:
>
> Statistically, in a large deployment regular segfaults may indicate a CPU issue.
>
> Currently, it is not possible to find out what CPU the segfault happened on.
> There are at least two attempts to improve segfault logging with this regard,
> but they do not help in case the logs rotate.
>
> Hence, lets make sure it is possible to permanently record a CPU
> the task ran on using a new core_pattern specifier.
>
> Suggested-by: Renaud Métrich <rmetrich@...hat.com>
> Signed-off-by: Oleksandr Natalenko <oleksandr@...hat.com>
> ---
>  Documentation/admin-guide/sysctl/kernel.rst | 1 +
>  fs/coredump.c                               | 5 +++++
>  include/linux/coredump.h                    | 1 +
>  3 files changed, 7 insertions(+)

Reviewed-by: Oleg Nesterov <oleg@...hat.com>