From owner-p4-projects  Wed May 29  7:34:48 2002
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Date: Wed, 29 May 2002 10:34:28 -0400
From: Bosko Milekic <bmilekic@unixdaemons.com>
To: John Baldwin <jhb@freebsd.org>
Cc: Perforce Change Reviews <perforce@freebsd.org>
Subject: Re: PERFORCE change 12066 for review
Message-ID: <20020529103428.A68375@unixdaemons.com>
References: <200205291429.g4TETgb19707@freefall.freebsd.org>
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In-Reply-To: <200205291429.g4TETgb19707@freefall.freebsd.org>; from jhb@freebsd.org on Wed, May 29, 2002 at 07:29:42AM -0700
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This is a great change.  How soon will we see it in CVS?

On Wed, May 29, 2002 at 07:29:42AM -0700, John Baldwin wrote:
> http://people.freebsd.org/~peter/p4db/chv.cgi?CH=12066
> 
> Change 12066 by jhb@jhb_laptop on 2002/05/29 07:28:41
> 
> 	Spin w/o holding sched_lock until mtx_lock changes when we are
> 	adaptively spinning.
> 
> Affected files ...
> 
> ... //depot/projects/smpng/sys/kern/kern_mutex.c#34 edit
> 
> Differences ...
> 
> ==== //depot/projects/smpng/sys/kern/kern_mutex.c#34 (text+ko) ====
> 
> @@ -533,9 +533,11 @@
>  		if (m != &Giant && owner->td_kse != NULL &&
>  		    owner->td_kse->ke_oncpu != NOCPU) {
>  			mtx_unlock_spin(&sched_lock);
> +			while (mtx_owner(m) == owner) {
>  #ifdef __i386__
> -			cpu_pause();
> +				cpu_pause();
>  #endif
> +			}
>  			continue;
>  		}
>  #endif	/* SMP && ADAPTIVE_MUTEXES */
> 

-- 
Bosko Milekic
bmilekic@unixdaemons.com
bmilekic@FreeBSD.org


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