From owner-freebsd-arch  Mon Apr  1  9: 3:45 2002
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Date: Mon, 1 Apr 2002 12:05:02 -0500
From: Jake Burkholder <jake@locore.ca>
To: Dag-Erling Smorgrav <des@ofug.org>
Cc: arch@FreeBSD.ORG
Subject: Re: mutex profiling
Message-ID: <20020401120502.G207@locore.ca>
References: <xzp8z88e6i1.fsf@flood.ping.uio.no>
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In-Reply-To: <xzp8z88e6i1.fsf@flood.ping.uio.no>; from des@ofug.org on Mon, Apr 01, 2002 at 12:07:18AM +0200
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Apparently, On Mon, Apr 01, 2002 at 12:07:18AM +0200,
	Dag-Erling Smorgrav said words to the effect of;

> 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

You can use the get_cyclecount() function as an MI way to read the tsc
or whatever cheap cyclecounter an architecture provides.  I think everything
we run on but i386 and i486 have one.

Jake

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