| commit | 9abb66c539ab08f4f52889cf0a6f032797db052e | |
| author | Matthew Dillon <dillon@apollo.backplane.com> | |
| Tue, 17 Apr 2018 04:27:14 +0000 (16 21:27 -0700) | ||
| committer | Matthew Dillon <dillon@apollo.backplane.com> | |
| Tue, 17 Apr 2018 04:27:14 +0000 (16 21:27 -0700) | ||
| tree | 085775d46727aedfa1494118917413c23b19ccc0 | treesnapshot (tar.gz zip) |
| parent | 6836202ae0b81869e096204d5b201fedf45284f1 | commitdiff |
kernel - Improve spinlock performance a bit
* Rearrange indefinite_init() and cpu_pause() in _spin_lock_contested()
and _spin_lock_shared_contested() to improve performance.
* Fix conditional clearing the SHARED bit to use ovalue intead of
value. After review, either can be used but ovalue is more
appropriate and give us an interlock against SPINLOCK_EXCLWAIT.
Reported-by: mjg_
* Rearrange indefinite_init() and cpu_pause() in _spin_lock_contested()
and _spin_lock_shared_contested() to improve performance.
* Fix conditional clearing the SHARED bit to use ovalue intead of
value. After review, either can be used but ovalue is more
appropriate and give us an interlock against SPINLOCK_EXCLWAIT.
Reported-by: mjg_
| sys/kern/kern_spinlock.c | diffblobblamehistory |