[Bug 272238] False sharing with pthread rw and spin locks leads to severe perf degradation

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272238

--- Comment #6 from commit-hook@FreeBSD.org ---
A commit in branch stable/13 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=cbca929869a818c9b3353753df71210816a126d6

commit cbca929869a818c9b3353753df71210816a126d6
Author:     Greg Becker <becker.greg@att.net>
AuthorDate: 2023-06-27 01:08:29 +0000
Commit:     Mateusz Guzik <mjg@FreeBSD.org>
CommitDate: 2023-07-05 12:34:09 +0000

    libpthread: allocate rwlocks and spinlocks in dedicated cachelines

    Reduces severe performance degradation due to false-sharing. Note that this
    does not account for hardware which can perform adjacent cacheline
prefetch.

    [mjg: massaged the commit message and the patch to use aligned_alloc
    instead of malloc]

    PR:     272238
    MFC after:      1 week

    (cherry picked from commit a6c0d801ca5934bb9b9cca6870ea7406d5db0641)

 lib/libthr/thread/thr_pspinlock.c | 3 ++-
 lib/libthr/thread/thr_rwlock.c    | 5 ++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

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