Re: [PATCH] sched: cpuacct: Use bigger percpu counter batch valuesfor stats counters

From: Peter Zijlstra
Date: Mon Jan 18 2010 - 03:35:19 EST

On Mon, 2010-01-18 at 19:21 +1100, Anton Blanchard wrote:
> Hi Peter,
> > Seems like a good idea, but isn't that batch number rather static? If
> > so, computing it in some init path would save that multiply on the
> > actual accounting path.
> It is mostly static, but percpu_counter_batch does change with hotplug
> operations. Adding a hotplug notifier felt like a lot of work but I was
> worried we have issues if we didn't scale with hotplug add operations.

OK, trading a notifier for a mult might be worth it, we'll see if
someone complains ;-)

Lets got with this for now.

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