Date: Mon, 26 Aug 2002 19:48:12 +0100 From: Ian Dowse <iedowse@maths.tcd.ie> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/sys ktr.h src/sys/kern kern_mutex.c Message-ID: <200208261948.aa37056@salmon.maths.tcd.ie> In-Reply-To: Your message of "Mon, 26 Aug 2002 11:39:38 PDT." <200208261839.g7QIdckr094663@freefall.freebsd.org>
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In message <200208261839.g7QIdckr094663@freefall.freebsd.org>, Ian Dowse writes : > Add a new KTR type KTR_CONTENTION, and use it in the mutex code to > log the start and end of periods during which mtx_lock() is waiting > to acquire a sleep mutex. The log message includes the file and > line of both the waiter and the holder. A simple perl script for parsing the output of ktrdump into some mutex contention statistics is at: http://people.freebsd.org/~iedowse/mtx_contention/ Without increasing the KTR buffer size or taking a lot of samples, these statistics are going to be fairly crude, but they may help to give some information about where the biggest bottlenecks lie. Ian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
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