diff options
| author | Ming Lei <ming.lei@redhat.com> | 2022-01-10 10:29:45 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-02-08 16:54:50 +0300 |
| commit | 3301bc53358a0eb0a0db65fd7a513cd4cb50c83a (patch) | |
| tree | 3f5eb173048d91b9bba51bf1457028ca2620fb60 /tools/perf/scripts/python/syscall-counts.py | |
| parent | abfc426d1b2fb2176df59851a64223b58ddae7e7 (diff) | |
| download | linux-3301bc53358a0eb0a0db65fd7a513cd4cb50c83a.tar.xz | |
lib/sbitmap: kill 'depth' from sbitmap_word
Only the last sbitmap_word can have different depth, and all the others
must have same depth of 1U << sb->shift, so not necessary to store it in
sbitmap_word, and it can be retrieved easily and efficiently by adding
one internal helper of __map_depth(sb, index).
Remove 'depth' field from sbitmap_word, then the annotation of
____cacheline_aligned_in_smp for 'word' isn't needed any more.
Not see performance effect when running high parallel IOPS test on
null_blk.
This way saves us one cacheline(usually 64 words) per each sbitmap_word.
Cc: Martin Wilck <martin.wilck@suse.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Martin Wilck <mwilck@suse.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/20220110072945.347535-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions