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Subject: Re: 2.6.17-mm6
From: Arjan van de Ven <arjan@infradead.org>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@osdl.org>, kmannth@gmail.com,
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Date: Thu, 06 Jul 2006 09:31:15 +0200
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On Thu, 2006-07-06 at 01:18 -0600, Eric W. Biederman wrote:

Hi,


> Andrew Morton <akpm@osdl.org> writes:
> 
> > On Wed, 5 Jul 2006 22:59:05 -0700
> > Andrew Morton <akpm@osdl.org> wrote:
> >
> >> On Wed, 05 Jul 2006 23:42:00 -0600
> >> ebiederm@xmission.com (Eric W. Biederman) wrote:
> >> 
> >> > So I suspect that we need to de-percpuify kernel_stat.irqs.
> >> 
> >> I think so.
> >
> > Maybe not.  If we do this, we lose the pretty CPUn columns in
> > /proc/interrupts.  That /proc/interrupts display requires that we maintain
> > NR_CPUS*NR_IRQS counters.
> 
> Yes.  Although at least part of that display is per architecture
> so we may be able to get away with a little more.

irqbalance uses the per column data for it's work.. please don't kill
the information or format.

Also if you have 1 number per irq, you keep bouncing that cacheline
around *all the time* if your irq policy is set to rotating (as many
chipsets do by default unless the OS overrides it)

Greetings,
    Arjan van de Ven