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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>
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