Date: Sat, 14 Dec 1996 15:45:28 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: toor@dyson.iquest.net (John S. Dyson) Cc: phk@critter.tfs.com, dyson@freebsd.org, peter@spinner.dialix.com, smp@freebsd.org, haertel@ichips.intel.com Subject: Re: some questions concerning TLB shootdowns in FreeBSD Message-ID: <199612142245.PAA22458@phaeton.artisoft.com> In-Reply-To: <199612142222.RAA05499@dyson.iquest.net> from "John S. Dyson" at Dec 14, 96 05:22:22 pm
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> > Is there any cheap way to keep a refcount (or bitmap) per vm-object so > > we can see if we need to kick the other CPUs if we fiddle it ? > > That would be tricky if we can freely reschedule processes on other > cpu's... It would entail traversing the map for the process when > the process is scheduled. Normally, there is also no notification > when a page table entry is fetched into the TLB. Such notification > can be arranged on the advanced X86 processors, but it doesn't > appear to be a guaranteed type thing. You could simplify this a lot by preferential scheduling. You could also keep a bitmap of the virtual address space and examine only those areas where a bitmap collides... Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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