From: Christoph Lameter <redacted>
Date: Tue, 27 Jan 2009 15:08:57 -0500 (EST)

On Tue, 27 Jan 2009, Tejun Heo wrote:

quoted

quoted

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"