Re: [PATCH v3] exit: combine work under lock in synchronize_group_exit() and coredump_task_exit()

[Oleg Nesterov]

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@xxxxxxxxx>

Reviewed-by: Oleg Nesterov <oleg@xxxxxxxxxx>