Re: [PATCH v4 1/1] loop: scale loop device by introducing per device lock
From: Jens Axboe <axboe@kernel.dk>
Date: 2021-01-27 03:18:06
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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. -- Jens Axboe