Re: [PATCH v4 1/1] loop: scale loop device by introducing per device lock

[Pavel Tatashin]

On Tue, Jan 26, 2021 at 3:09 PM Jens Axboe <axboe@xxxxxxxxx> wrote:
>
> On 1/26/21 7:46 AM, Pavel Tatashin wrote:
> > 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
> > modifications of all fields in struct loop_device.
> >
> > Keep loop_ctl_mutex to protect global data: loop_index_idr, loop_lookup,
> > loop_add.
> >
> > The new lock ordering requirement is that loop_ctl_mutex must be taken
> > before lo_mutex.
>
> Applied, thanks.

Great, thank you!

Pasha

>
> --
> Jens Axboe
>