Re: [PATCH] Per cpu irq stat

From: Christoph Lameter
Date: Tue Mar 15 2005 - 11:56:07 EST

On Tue, 15 Mar 2005, Christoph Hellwig wrote:

> On Mon, Mar 14, 2005 at 10:32:34PM -0800, Christoph Lameter wrote:
> > The definition of the irq_stat as an array means that the individual
> > elements of the irq_stat array are located on one NUMA node requiring
> > internode traffic to access irq_stat from other nodes. This patch makes
> > irq_stat a per_cpu variable which allows most accesses to be local.
> There's architectures accessing it from assemly.

The patch is i386 specific!

> But furthermore there's absolutely not point for the irq_stat structure
> at all anymore now that we have the per_cpu infrastructure. so kill it
> completely and let every architecture just provide a local_softirq_pending
> macro.

That would require reworking a lot of architectures.

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