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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-28 09:04:41 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-28 09:04:41 -0800 |
| commit | d039f38801245ed99c0351b2259550170d7fe17b (patch) | |
| tree | cea1890c9070f4edd6ac3e8811ba4cdb1499e410 /kernel/async.c | |
| parent | f8132d62a2deedca1b7558028cfe72f93ad5ba2d (diff) | |
| parent | 14c24048841151548a3f4d9e218510c844c1b737 (diff) | |
Merge tag 'locking-urgent-2021-11-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking fixes from Thomas Gleixner:
"Two regression fixes for reader writer semaphores:
- Plug a race in the lock handoff which is caused by inconsistency of
the reader and writer path and can lead to corruption of the
underlying counter.
- down_read_trylock() is suboptimal when the lock is contended and
multiple readers trylock concurrently. That's due to the initial
value being read non-atomically which results in at least two
compare exchange loops. Making the initial readout atomic reduces
this significantly. Whith 40 readers by 11% in a benchmark which
enforces contention on mmap_sem"
* tag 'locking-urgent-2021-11-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
locking/rwsem: Optimize down_read_trylock() under highly contended case
locking/rwsem: Make handoff bit handling more consistent
Diffstat (limited to 'kernel/async.c')
0 files changed, 0 insertions, 0 deletions