Re: CVS commit: src

[yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi)]

> 
> Module Name:  src
> Committed By: ad
> Date:         Fri Apr  4 17:25:10 UTC 2008
> 
> Modified Files:
>       src/sys/kern: kern_rwlock.c
>       src/usr.sbin/lockstat: main.c
> 
> Log Message:
> Do adaptive spinning for rwlocks, but only if the lock is write held and
> there are no waiters. This gives a major boost to build.sh on larger
> systems as directory vnode locks are exclusive for lookup, but are often
> only held for a very short period of time.
> 
> This change has the potential to more readily expose lock order reversals
> and other types of deadlock.
> 
> 
> To generate a diff of this commit:
> cvs rdiff -r1.18 -r1.19 src/sys/kern/kern_rwlock.c
> cvs rdiff -r1.11 -r1.12 src/usr.sbin/lockstat/main.c
> 
> Please note that diffs are not public domain; they are subject to the
> copyright notices on the relevant files.

is mutex_onproc safe for rwlock, esp for !__HAVE_SIMPLE_MUTEXES?

YAMAMOTO Takashi