Re: [Xen-devel] [PATCH 00/12] cpumask handling scalability improvements

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.10.11 at 17:19, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
>>>> On 20.10.11 at 17:09, Keir Fraser <keir.xen@xxxxxxxxx> wrote:
>> I suppose there is a second argument that it shrinks the containing
>> structures (struct domain, struct vcpu, struct irq_desc, ...) and maybe
>> helps reduce our order!=0 allocations?
> 
> Yes - that's what made me start taking over these Linux bits. What I
> sent here just continues on that route. I was really hoping that we
> wouldn't leave this in a half baked state.

I forgot to say: The new accessors produce a little more legible code
with cpumask_var_t and cpumask_t * (the second we converted to
already wherever possible) than with cpumask_t, because of the need
to use & on the latter (and as you will see they also allow removing a
number of ugly looking * operators, which I always considered only
temporary).

Jan




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