Re: [Xen-devel] [PATCH v8 03/13] x86: maintain COS to CBM mapping for each socket

[Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>]

On Mon, Jun 01, 2015 at 09:36:15AM +0100, Jan Beulich wrote:
> >>> On 01.06.15 at 10:05, <chao.p.peng@xxxxxxxxxxxxxxx> wrote:
> > 2)  Unfeasible to allocate memory first and do initialization later in
> > cpu hotplug notifications. My former approach is performing both the
> > allocation and initialization in the CPU_STARTING, which is not a good
> > idea indicated by Jan.
> 
> Considering
> 
>          info->cos_max = min(opt_cos_max, edx & 0xffff);
> 
> I don't see why you couldn't do an allocation using opt_cos_max
> in CPU_UP_PREPARE, potentially not using all of the slots later
> on.

If memory waste is not a problem (especially in most cases opt_cos_max is
its default 255), then this would be a solution.

As you have suggested this, then I think I can go on this path and still
have asymmetry systems been supported.

Thanks,
Chao

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