Messages in this thread | | | Date | Tue, 27 Jan 2009 13:47:47 -0800 (PST) | Subject | Re: [PATCH] percpu: add optimized generic percpu accessors | From | David Miller <> |
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From: Christoph Lameter <cl@linux-foundation.org> Date: Tue, 27 Jan 2009 15:08:57 -0500 (EST)
> On Tue, 27 Jan 2009, Tejun Heo wrote: > > > > later). That's because they use TLB tricks for a static 64k per-cpu > > > area, but this doesn't scale. That might not be vital: abandoning > > > that trick will mean they can't optimise read_percpu/read_percpu_var > > > etc as much. > > Why wont it scale? this is a separate TLB entry for each processor.
The IA64 per-cpu TLB entry only covers 64k which makes use of it for dynamic per-cpu stuff out of the question. That's why it "doesn't scale"
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