Date: Mon, 4 Dec 2000 14:36:44 -0700 (MST) From: <janb@cs.utep.edu> To: Bernd Walter <ticso@cicely8.cicely.de> Cc: David Greenman <dg@root.com>, <freebsd-current@FreeBSD.ORG> Subject: Re: current paging strategy Message-ID: <Pine.GSO.4.30.0012041436290.19621-100000@gecko> In-Reply-To: <20001105175745.A42346@cicely8.cicely.de>
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what exacly do you mean with critical path, here? JAn On Sun, 5 Nov 2000, Bernd Walter wrote: > On Thu, Nov 02, 2000 at 12:45:30AM -0800, David Greenman wrote: > > >Interesting. THis needs about two bytes per page for the counter? > > > > Actually, we found that a single byte per page was sufficient. Pages tended > > to be either heavily accessed or rarely accessed. Even in the unusual case > > where all pages are frequently accessed, the page reclaim rate (and thus > > adjustment rate of the page references count) increases high enough to still > > provide for a decent distribution of the counters and for the page LOU to be > > effective. > > One byte sounds good for i386. > Maybe it makes sense to have it 4 or 8 byte on risc platforms. > I wonder if it's a critical path and if there are more of this in > the kernel source. > > -- > B.Walter COSMO-Project http://www.cosmo-project.de > ticso@cicely.de Usergroup info@cosmo-project.de > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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