rhashtable: use likely for rhashtable lookup

Browse source

Sometimes, the result of the rhashtable_lookup() is expected to be found.
Therefore, we can use likely() for such cases.

Following new functions are introduced, which will use likely or unlikely
during the lookup:

 rhashtable_lookup_likely
 rhltable_lookup_likely

A micro-benchmark is made for these new functions: lookup a existed entry
repeatedly for 100000000 times, and rhashtable_lookup_likely() gets ~30%
speedup.

Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

...

This commit is contained in:

Menglong Dong 2025-10-11 09:48:55 +08:00 • committed by Herbert Xu

parent 9b04d8f005

commit aa653654ee

1 changed files with 58 additions and 12 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

70

include/linux/rhashtable.h

View file