Date: Wed, 15 May 2002 10:06:36 -0700 From: Alfred Perlstein <bright@mu.org> To: "Andrew R. Reiter" <arr@FreeBSD.org> Cc: Terry Lambert <tlambert2@mindspring.com>, Richard Sharpe <rsharpe@ns.aus.com>, freebsd-hackers@FreeBSD.org Subject: Re: File locking, closes and performance in a distributed filesystemenv Message-ID: <20020515170636.GI1585@elvis.mu.org> In-Reply-To: <Pine.NEB.3.96L.1020515125325.98224B-100000@fledge.watson.org> References: <20020515155101.GF1585@elvis.mu.org> <Pine.NEB.3.96L.1020515125325.98224B-100000@fledge.watson.org>
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* Andrew R. Reiter <arr@FreeBSD.org> [020515 09:54] wrote: > On Wed, 15 May 2002, Alfred Perlstein wrote: > > :* Terry Lambert <tlambert2@mindspring.com> [020515 01:36] wrote: > :> Alfred Perlstein wrote: > :> > As Terry stated you can't do that, however you could cache that the > :> > VNODE has a lock, that would reduce the requirement for calling the > :> > ADVLOCK VOP. > :> You'd really have to know when the lock list went to NULL, to get > :> any benefit out of it, since locking would still end up being per-file > :> sticky. You could post-check after every successful unlock... but to > :> cache the remote state would mean another RPC to ask for locks, which > :> would just be front-loading the expense, instead of back-loading it. > : > :[snip] > : > :He could also maintain a local cache of this per vnode, basically > :maintain a mirror of the lock list locally in order to see if a remote > :op must be done. > > Isn't this sorta like coda? I'm not a coda expert so I wouldn't know, but I wasn't professing to have invented something profound by suggesting a client cache. :) -- -Alfred Perlstein [alfred@freebsd.org] 'Instead of asking why a piece of software is using "1970s technology," start asking why software is ignoring 30 years of accumulated wisdom.' Tax deductible donations for FreeBSD: http://www.freebsdfoundation.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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