core_pattern: add CPU specifier

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.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Oleksandr Natalenko <[email protected]>
Suggested-by: Renaud Métrich <[email protected]>
Reviewed-by: Oleg Nesterov <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: "Eric W . Biederman" <[email protected]>
Cc: Grzegorz Halat <[email protected]>
Cc: "Guilherme G. Piccoli" <[email protected]>
Cc: "Huang, Ying" <[email protected]>
Cc: Jason A. Donenfeld <[email protected]>
Cc: Joel Savitz <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Laurent Dufour <[email protected]>
Cc: Luis Chamberlain <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Stephen Kitt <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Xiaoming Ni <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions