Files
linux/lib
Ming Lei 863a66cdb4 lib/sbitmap: allocate sb->map via kvzalloc_node
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.

Avoid the issue by using kvzalloc_node() for allocating sb->map.

Cc: Ewan D. Milne <emilne@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220316012708.354668-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2022-03-21 20:01:34 -06:00
..
2021-07-08 11:48:20 -07:00
2021-09-08 11:50:26 -07:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-11-18 13:16:22 -08:00
2021-05-06 19:24:12 -07:00
2021-01-21 14:06:00 -07:00
2021-06-05 08:58:12 -07:00
2021-08-19 09:02:55 +09:00
2021-01-03 20:05:18 -05:00
2022-01-15 08:47:31 -08:00
2021-08-19 09:02:55 +09:00
2021-07-08 11:48:20 -07:00
2022-01-20 08:52:53 +02:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-08-08 13:00:20 +01:00
2021-09-17 13:52:17 +01:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-07-08 11:48:20 -07:00
2021-06-18 11:43:09 +02:00
2021-07-08 11:48:20 -07:00
2022-01-20 08:52:54 +02:00
2021-07-08 11:48:20 -07:00
2021-08-13 13:19:06 -06:00
2022-01-08 00:28:41 -05:00