Date: Tue, 30 Nov 2004 17:34:45 +0100 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Ian Dowse <iedowse@maths.tcd.ie> Cc: arch@freebsd.org Subject: Re: Simpler SMP-friendly callout/timeout semantics Message-ID: <50015.1101832485@critter.freebsd.dk> In-Reply-To: Your message of "Wed, 17 Nov 2004 23:22:56 GMT." <200411172322.aa34520@salmon.maths.tcd.ie>
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In message <200411172322.aa34520@salmon.maths.tcd.ie>, Ian Dowse writes: > >The current callout/timeout API supports Giant-locked and MP-safe >usage options, but in both cases it is very difficult to use the >API in a way that is free of race conditions and complications. >Below is an attempt to extend that API to offer much simpler semantics >to many users while not limiting its usefulness or performance. > >Do people think that a change like this is worth attempting? Are >there further improvements that could be made or any other suggestions >or comments? Sounds good to me. Do you try to optimize softclock to not stall on the mutex and instead find any other pending callouts to handle ? -- 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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