Date: Mon, 01 Apr 2002 00:12:50 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Dag-Erling Smorgrav <des@ofug.org> Cc: arch@FreeBSD.ORG Subject: Re: mutex profiling Message-ID: <29646.1017612770@critter.freebsd.dk> In-Reply-To: Your message of "01 Apr 2002 00:07:18 %2B0200." <xzp8z88e6i1.fsf@flood.ping.uio.no>
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With the footnote that the TSC's are not synchronized on SMP systems, this looks like a nice initial tool to get some kind of picture of the locking situation in the kernel. Poul-Henning In message <xzp8z88e6i1.fsf@flood.ping.uio.no>, Dag-Erling Smorgrav writes: >--=-=-= > >The attached patch (derived from patches by Eivind) adds code to >record statistics about MTX_DEF locks. It's currently i386-only as it >uses the TSC to measure the amount of time each mutex is held. Once -- 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. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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