Searched hist:"863 a66cd" (Results 1 – 2 of 2) sorted by relevance
| /openbmc/linux/include/linux/ |
| H A D | sbitmap.h | 863a66cd Tue Mar 15 20:27:08 CDT 2022 Ming Lei <ming.lei@redhat.com> 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>
|
| /openbmc/linux/lib/ |
| H A D | sbitmap.c | 863a66cd Tue Mar 15 20:27:08 CDT 2022 Ming Lei <ming.lei@redhat.com> 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>
|