Messages in this thread | | | Date | Fri, 2 Nov 2001 05:12:12 +0000 | From | Pavel Machek <> | Subject | Re: aio-core why not using SuS? [Re: [rfc] aio-core for 2.5.29 (Re: async-io API registration for 2.5.29)] |
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Hi! > > But if you have such a mapping, then you _cannot_ make a per-task VM > space, because many tasks will share the same VM. You cannot even do a > per-cpu mapping change (and rewrite the VM on thread switch), since the VM > is _shared_ across CPU's, and absolutely has to be in order to work with > CPU's that do TLB fill in hardware (eg x86).
You could have different %cr3 on different CPUs and use page tables as TLBs (emulating software-filled TLBs, basically); but that smells like "bye bye performance". Pavel -- Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt, details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
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