Date: Thu, 07 Dec 2006 22:39:59 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Alexey Dokuchaev <danfe@FreeBSD.org> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/kern kern_synch.c Message-ID: <97086.1165531199@critter.freebsd.dk> In-Reply-To: Your message of "Thu, 07 Dec 2006 14:43:57 GMT." <20061207144356.GB14587@FreeBSD.org>
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In message <20061207144356.GB14587@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@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.
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