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| author | Attilio Rao <attilio@FreeBSD.org> | 2009-05-29 01:49:27 +0000 |
|---|---|---|
| committer | Attilio Rao <attilio@FreeBSD.org> | 2009-05-29 01:49:27 +0000 |
| commit | 1ae1c2a3bde1246e052fed34be63bac5d6ba1c31 (patch) | |
| tree | 4743eb3cdc33a7b72ea4fc1d92c144595e06994e /sys/cddl/compat/opensolaris/sys/rwlock.h | |
| parent | 1a9dc239f5fcfcc1a18713cc53a3e9b28ba3edce (diff) | |
| download | src-1ae1c2a3bde1246e052fed34be63bac5d6ba1c31.tar.gz src-1ae1c2a3bde1246e052fed34be63bac5d6ba1c31.zip | |
Reverse the logic for ADAPTIVE_SX option and enable it by default.
Introduce for this operation the reverse NO_ADAPTIVE_SX option.
The flag SX_ADAPTIVESPIN to be passed to sx_init_flags(9) gets suppressed
and the new flag, offering the reversed logic, SX_NOADAPTIVE is added.
Additively implements adaptive spininning for sx held in shared mode.
The spinning limit can be handled through sysctls in order to be tuned
while the code doesn't reach the release, after which time they should
be dropped probabilly.
This change has made been necessary by recent benchmarks where it does
improve concurrency of workloads in presence of high contention
(ie. ZFS).
KPI breakage is documented by __FreeBSD_version bumping, manpage and
UPDATING updates.
Requested by: jeff, kmacy
Reviewed by: jeff
Tested by: pho
Notes
Notes:
svn path=/head/; revision=193011
Diffstat (limited to 'sys/cddl/compat/opensolaris/sys/rwlock.h')
| -rw-r--r-- | sys/cddl/compat/opensolaris/sys/rwlock.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/cddl/compat/opensolaris/sys/rwlock.h b/sys/cddl/compat/opensolaris/sys/rwlock.h index 0d4ac2e1e2a9..a3e55153bbcf 100644 --- a/sys/cddl/compat/opensolaris/sys/rwlock.h +++ b/sys/cddl/compat/opensolaris/sys/rwlock.h @@ -49,9 +49,9 @@ typedef enum { typedef struct sx krwlock_t; #ifndef DEBUG -#define RW_FLAGS (SX_DUPOK | SX_NOWITNESS | SX_ADAPTIVESPIN) +#define RW_FLAGS (SX_DUPOK | SX_NOWITNESS) #else -#define RW_FLAGS (SX_DUPOK | SX_ADAPTIVESPIN) +#define RW_FLAGS (SX_DUPOK) #endif #define RW_READ_HELD(x) (rw_read_held((x))) |