cvs commit: src/sys/kern kern_synch.c

[Poul-Henning Kamp]

In message <20061207144356.GB14587 at FreeBSD.org>, Alexey Dokuchaev writes:
>On Thu, Nov 30, 2006 at 08:27:38AM +0000, Poul-Henning Kamp wrote:
>> phk         2006-11-30 08:27:38 UTC
>> 
>>   FreeBSD src repository
>> 
>>   Modified files:
>>     sys/kern             kern_synch.c 
>>   Log:
>>   Only grab the sched_lock if we actually need to modify the thread priority.
>>   
>>   During a buildworld only 2/3 of the calls to msleep actually changed
>>   the priority.
>
>Did you, by chance, have any benchmarks on this?

I didn't have time to do precise benchmarks and it wasn't statistically
significant in imprecise ones.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.