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| author | Jens Axboe <axboe@fb.com> | 2014-05-09 21:41:15 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-05-09 21:41:15 +0200 |
| commit | 59d13bf5f57ded658c872fa22276f75ab8f12841 (patch) | |
| tree | ea3b3bf9395c01a5443c2e01874837a19d6e4c62 /mm/fadvise.c | |
| parent | blk-mq: implement new and more efficient tagging scheme (diff) | |
| download | linux-59d13bf5f57ded658c872fa22276f75ab8f12841.tar.xz linux-59d13bf5f57ded658c872fa22276f75ab8f12841.zip | |
blk-mq: use sparser tag layout for lower queue depth
For best performance, spreading tags over multiple cachelines
makes the tagging more efficient on multicore systems. But since
we have 8 * sizeof(unsigned long) tags per cacheline, we don't
always get a nice spread.
Attempt to spread the tags over at least 4 cachelines, using fewer
number of bits per unsigned long if we have to. This improves
tagging performance in setups with 32-128 tags. For higher depths,
the spread is the same as before (BITS_PER_LONG tags per cacheline).
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'mm/fadvise.c')
0 files changed, 0 insertions, 0 deletions