Re: [PATCH] core_pattern: add CPU specifier

Andrew Morton
2022-09-04T18:27:27Z

On Sat, 3 Sep 2022 08:43:30 +0200 Oleksandr Natalenko <oleksandr@redhat.com> 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.
>
> ...
>
> }
> @@ -535,6 +539,7 @@ void do_coredump(const kernel_siginfo_t *siginfo)
> */
> .mm_flags = mm->flags,
> .vma_meta = NULL,
> + .cpu = raw_smp_processor_id(),
> };

Why use the "raw_" function here?