diff options
| author | jhb <jhb@FreeBSD.org> | 2007-03-22 16:09:23 +0000 |
|---|---|---|
| committer | jhb <jhb@FreeBSD.org> | 2007-03-22 16:09:23 +0000 |
| commit | ec6d5dd10f12c768cbb975d10e8631d80dbaedaf (patch) | |
| tree | 69d3ab7d12cac26ee972a8c1dc9da19a04dbe951 /sys/conf/NOTES | |
| parent | fe8d58a25179cd902bada0d91a0f2921ecd09934 (diff) | |
| download | FreeBSD-src-ec6d5dd10f12c768cbb975d10e8631d80dbaedaf.zip FreeBSD-src-ec6d5dd10f12c768cbb975d10e8631d80dbaedaf.tar.gz | |
- Simplify the #ifdef's for adaptive mutexes and rwlocks by conditionally
defining a macro earlier in the file.
- Add NO_ADAPTIVE_RWLOCKS option to disable adaptive spinning for rwlocks.
Diffstat (limited to 'sys/conf/NOTES')
| -rw-r--r-- | sys/conf/NOTES | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/conf/NOTES b/sys/conf/NOTES index 8e2c447..88086cb 100644 --- a/sys/conf/NOTES +++ b/sys/conf/NOTES @@ -202,6 +202,12 @@ options SMP # Symmetric MultiProcessor Kernel # to disable it. options NO_ADAPTIVE_MUTEXES +# ADAPTIVE_RWLOCKS changes the behavior of reader/writer locks to spin +# if the thread that currently owns the rwlock is executing on another +# CPU. This behaviour is enabled by default, so this option can be used +# to disable it. +options NO_ADAPTIVE_RWLOCKS + # ADAPTIVE_GIANT causes the Giant lock to also be made adaptive when # running without NO_ADAPTIVE_MUTEXES. Normally, because Giant is assumed # to be held for extended periods, contention on Giant will cause a thread |
