[Xen-devel] Re: next->vcpu_dirty_cpumask checking at the top of context_switch()

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> Keir Fraser <keir.fraser@xxxxxxxxxxxxx> 04/16/09 6:00 PM >>>
>How big NR_CPUS are we talking about? Is the overhead measurable, or is this
>a premature micro-optimisation?

We're shipping Xen in SLE11 with NR_CPUS=255, and I'm convinced we'll be asked to up this further in the service packs.

Also, micro-optimization reads for me like I was aiming at a performance issue, but the goal really just is to get the use of stack space down (and in particular, make it as independent as possible from configuration settings).

Jan

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