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| author | dillon <dillon@FreeBSD.org> | 1999-11-19 16:49:30 +0000 |
|---|---|---|
| committer | dillon <dillon@FreeBSD.org> | 1999-11-19 16:49:30 +0000 |
| commit | 1ac9471dbc55b5fa42d36aa8041ffbe7f64bf917 (patch) | |
| tree | a4124d514335e75961eb168aa446f957cbedfe22 /sys/i386/include/asnames.h | |
| parent | 3544d646b5ba034af1430a8d204a232f969894de (diff) | |
| download | FreeBSD-src-1ac9471dbc55b5fa42d36aa8041ffbe7f64bf917.zip FreeBSD-src-1ac9471dbc55b5fa42d36aa8041ffbe7f64bf917.tar.gz | |
Optimize two cases in the MP locking code. First, it is not necessary
to use a locked cmpexg when unlocking a lock that we already hold, since
nobody else can touch the lock while we hold it. Second, it is not
necessary to use a locked cmpexg when locking a lock that we already
hold, for the same reason. These changes will allow MP locks to be used
recursively without impacting performance.
Modify two procedures that are called only by assembly and are already
NOPROF entries to pass a critical argument in %edx instead of on the
stack, removing a significant amount of code from the critical path
as a consequence.
Reviewed by: Alfred Perlstein <bright@wintelcom.net>, Peter Wemm <peter@netplex.com.au>
Diffstat (limited to 'sys/i386/include/asnames.h')
| -rw-r--r-- | sys/i386/include/asnames.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/i386/include/asnames.h b/sys/i386/include/asnames.h index 8ab8dc7..17b20b5 100644 --- a/sys/i386/include/asnames.h +++ b/sys/i386/include/asnames.h @@ -60,7 +60,9 @@ #define _KPTphys KPTphys #define _MP_GDT MP_GDT #define _MPgetlock MPgetlock +#define _MPgetlock_edx MPgetlock_edx #define _MPrellock MPrellock +#define _MPrellock_edx MPrellock_edx #define _MPtrylock MPtrylock #define _PTD PTD #define _PTDpde PTDpde |
