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SubjectRe: [rfc 00/45] [RFC] CPU ops and a rework of per cpu data handling on x86_64
From: Andi Kleen <>
Date: Tue, 20 Nov 2007 04:25:34 +0100

> > Although we have a per-cpu area base in a fixed global register
> > for addressing, the above isn't beneficial on sparc64 because
> > the atomic is much slower than doing a:
> >
> > local_irq_disable();
> > nonatomic_percpu_memory_op();
> > local_irq_enable();
> Again might be pointing out the obvious, but you
> need of course save_flags()/restore_flags(), not disable/enable().

Right, but the cost is the same for that on sparc64 unlike
x86 et al.
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