Date: Thu, 28 May 2009 18:33:06 +0100 From: RW <rwmaillists@googlemail.com> To: freebsd-questions@freebsd.org Subject: Re: superpages? Message-ID: <20090528183306.061afc07@gumby.homeunix.com> In-Reply-To: <20090528151738.GC1259@phenom.cordula.ws> References: <alpine.BSF.2.00.0905281447040.60042@wojtek.tensor.gdynia.pl> <20090528151738.GC1259@phenom.cordula.ws>
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On Thu, 28 May 2009 17:17:38 +0200 cpghost <cpghost@cordula.ws> wrote: > The following excerpt from: > http://www.freebsd.org/releases/7.2R/relnotes-detailed.html > may be helpful: > > [amd64, i386] The FreeBSD virtual memory subsystem now supports > fully transparent use of superpages for application memory; > application memory pages are dynamically promoted to or demoted from > superpages without any modification to application code. This change > offers the benefit of large page sizes such as improved virtual > memory efficiency and reduced TLB (translation lookaside buffer) > misses without downsides like application changes and virtual memory > inflexibility. Just out of idle curiosity, how does it work at the page queue level. Most of the references to superpages are in pmap.c and vm_reserv.c. I don't see any special handling in the pageout daemon where the inactive and active queues are handled.
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