On Wed, 16 Mar 2022 09:27:08 +0800, Ming Lei wrote:
> sbitmap has been used in scsi for replacing atomic operations on
> sdev->device_busy, so IOPS on some fast scsi storage can be improved.
>
> However, sdev->device_busy can be changed in fast path, so we have to
> allocate the sb->map statically. sdev->device_busy has been capped to 1024,
> but some drivers may configure the default depth as < 8, then
> cause each sbitmap word to hold only one bit. Finally 1024 * 128(
> sizeof(sbitmap_word)) bytes is needed for sb->map, given it is order 5
> allocation, sometimes it may fail.
>
> [...]
Applied, thanks!
[1/1] lib/sbitmap: allocate sb->map via kvzalloc_node
commit: 863a66cdb4df25fd146d9851c3289072298566d5
Best regards,
--
Jens Axboe
