cvs commit: src/share/man/man9 Makefile sx.9 src/sys/conf NOTES options src/sys/dev/acpica acpi_ec.c src/sys/dev/mxge if_mxge.c src/sys/dev/usb if_aue.c if_axe.c src/sys/gnu/fs/xfs/FreeBSD/support mrlock.c mrlock.h ...

[Kris Kennaway]

eOn Sat, Mar 31, 2007 at 11:23:42PM +0000, John Baldwin wrote:
> jhb         2007-03-31 23:23:42 UTC
> 
>   FreeBSD src repository
> 
>   Modified files:
>     share/man/man9       Makefile sx.9 
>     sys/conf             NOTES options 
>     sys/dev/acpica       acpi_ec.c 
>     sys/dev/mxge         if_mxge.c 
>     sys/dev/usb          if_aue.c if_axe.c 
>     sys/gnu/fs/xfs/FreeBSD/support mrlock.c mrlock.h 
>     sys/i386/acpica      acpi_machdep.c 
>     sys/kern             kern_sx.c 
>     sys/netinet6         in6_src.c 
>     sys/sys              sleepqueue.h sx.h 
>   Added files:
>     sys/sys              _sx.h 
>   Log:
>   Optimize sx locks to use simple atomic operations for the common cases of
>   obtaining and releasing shared and exclusive locks.  The algorithms for
>   manipulating the lock cookie are very similar to that rwlocks.  This patch
>   also adds support for exclusive locks using the same algorithm as mutexes.

Thanks to Attilio for doing this work and to John for committing it.
This is a significant step forward for 7.0 and will be the basis for
some major performance optimizations to be committed in the near
future (e.g. filedesc locking from rwatson, which gives even better
mysql performance than the "tophalf" mutexes Jeff and I recently
benchmarked).

Kris
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