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author | Jens Axboe <axboe@kernel.dk> | 2021-10-09 22:02:23 +0300 |
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committer | Jens Axboe <axboe@kernel.dk> | 2021-10-18 15:17:35 +0300 |
commit | 9672b0d43782047b1825a96bafee1b6aefa35bc2 (patch) | |
tree | cbf520eccf39ff3e23cde171496c6d382e280bfa /block/blk-mq-tag.h | |
parent | 8971a3b7f1bf2b3096e558a0362a469dee77f426 (diff) | |
download | linux-9672b0d43782047b1825a96bafee1b6aefa35bc2.tar.xz |
sbitmap: add __sbitmap_queue_get_batch()
The block layer tag allocation batching still calls into sbitmap to get
each tag, but we can improve on that. Add __sbitmap_queue_get_batch(),
which returns a mask of tags all at once, along with an offset for
those tags.
An example return would be 0xff, where bits 0..7 are set, with
tag_offset == 128. The valid tags in this case would be 128..135.
A batch is specific to an individual sbitmap_map, hence it cannot be
larger than that. The requested number of tags is automatically reduced
to the max that can be satisfied with a single map.
On failure, 0 is returned. Caller should fall back to single tag
allocation at that point/
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq-tag.h')
0 files changed, 0 insertions, 0 deletions