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Date: Wed, 29 May 2002 10:39:45 -0400 (EDT)
From: John Baldwin <jhb@FreeBSD.org>
To: Bosko Milekic <bmilekic@unixdaemons.com>
Subject: Re: PERFORCE change 12066 for review
Cc: Perforce Change Reviews <perforce@freebsd.org>
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On 29-May-2002 Bosko Milekic wrote:
> 
> This is a great change.  How soon will we see it in CVS?

When it's tested.  I really try to avoid committing untested stuff, but
sometimes it is tempting for simple stuff like this.

> 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
> 

-- 

John Baldwin <jhb@FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/

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