Date: Mon, 12 May 2003 01:06:19 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Bakul Shah <bakul@bitblocks.com> Cc: "M. Warner Losh" <imp@bsdimp.com> Subject: Re: Interrupt latency problems Message-ID: <2905.1052694379@critter.freebsd.dk> In-Reply-To: Your message of "Sun, 11 May 2003 15:58:32 PDT." <200305112258.h4BMwWPF029180@bitblocks.com>
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In message <200305112258.h4BMwWPF029180@bitblocks.com>, Bakul Shah writes: >Is it possible to cheaply check how long a mutex was held? Have WITNESS store a timestamp when mutex is grabbed. Check delta-T when mutes is releases. Whine if above ? We already have a similar check for timeout functions, the policy I opted for there was to only whine if the duration was longer than the previous higest duration. Output looks like: Expensive timeout(9) function: 0xc03d01f0(0) 0.003696815 s This should be simple to implement for mutex'es too. -- 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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