Re: aio-core why not using SuS? [Re: [rfc] aio-core for 2.5.29 (Re: async-io API registration for 2.5.29)]

[Pavel Machek]

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.