Re: [PATCH v3 1/1] loop: scale loop device by introducing per device lock

[Pavel Tatashin]

On Tue, Jan 26, 2021 at 4:24 AM Petr Vorel <pvorel@xxxxxxx> wrote:
>
> Hi,
>
> > Currently, loop device has only one global lock:
> > loop_ctl_mutex.
>
> > This becomes hot in scenarios where many loop devices are used.
>
> > Scale it by introducing per-device lock: lo_mutex that protects the
> > fields in struct loop_device. Keep loop_ctl_mutex to protect global
> > data such as loop_index_idr, loop_lookup, loop_add.
>
> > Lock ordering: loop_ctl_mutex > lo_mutex.
>
> Reviewed-by: Petr Vorel <pvorel@xxxxxxx>

Thank you for reviewing this patch.

Pasha