diff options
| author | Thomas Gleixner <[email protected]> | 2020-03-08 19:07:17 +0100 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2020-03-09 22:33:09 +0100 |
| commit | 8d67743653dce5a0e7aa500fcccb237cde7ad88e (patch) | |
| tree | 777ab98cc4f98ecf6d7ed407672811a91a57e9d5 /tools/testing/selftests/bpf/prog_tests/sockmap_basic.c | |
| parent | 8019ad13ef7f64be44d4f892af9c840179009254 (diff) | |
futex: Unbreak futex hashing
The recent futex inode life time fix changed the ordering of the futex key
union struct members, but forgot to adjust the hash function accordingly,
As a result the hashing omits the leading 64bit and even hashes beyond the
futex key causing a bad hash distribution which led to a ~100% performance
regression.
Hand in the futex key pointer instead of a random struct member and make
the size calculation based of the struct offset.
Fixes: 8019ad13ef7f ("futex: Fix inode life-time issue")
Reported-by: Rong Chen <[email protected]>
Decoded-by: Linus Torvalds <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Rong Chen <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/sockmap_basic.c')
0 files changed, 0 insertions, 0 deletions