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 >
