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| author | Abel Wu <wuyun.wu@huawei.com> | 2020-10-13 16:48:40 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-13 18:38:27 -0700 |
| commit | c270cf3041a5cb7c5853d45a794309e66576493a (patch) | |
| tree | 53ec5da29e62574e8b50ce6bd1019c7e02964ad6 /.clang-format | |
| parent | d7cff4ded857ff7cc3e49eb39cc14df9345b9662 (diff) | |
| download | lwn-c270cf3041a5cb7c5853d45a794309e66576493a.tar.gz lwn-c270cf3041a5cb7c5853d45a794309e66576493a.zip | |
mm/slub.c: branch optimization in free slowpath
The two conditions are mutually exclusive and gcc compiler will optimise
this into if-else-like pattern. Given that the majority of free_slowpath
is free_frozen, let's provide some hint to the compilers.
Tests (perf bench sched messaging -g 20 -l 400000, executed 10x
after reboot) are done and the summarized result:
un-patched patched
max. 192.316 189.851
min. 187.267 186.252
avg. 189.154 188.086
stdev. 1.37 0.99
Signed-off-by: Abel Wu <wuyun.wu@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Hewenliang <hewenliang4@huawei.com>
Cc: Hu Shiyuan <hushiyuan@huawei.com>
Link: http://lkml.kernel.org/r/20200813101812.1617-1-wuyun.wu@huawei.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '.clang-format')
0 files changed, 0 insertions, 0 deletions