Re: [Xen-devel] [PATCH] xen: arm: perfc: count individual SGIs and PPIs

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 09.11.15 at 15:24, <julien.grall@xxxxxxxxxx> wrote:
> On 09/11/15 14:20, Ian Campbell wrote:
>> On Mon, 2015-11-09 at 07:11 -0700, Jan Beulich wrote:
>>>>>> On 09.11.15 at 15:01, <ian.campbell@xxxxxxxxxx> wrote:
>>>> SPIs are too numerous and not indivcidually as interesting.
>>>>
>>>> Make the exists #IPIS counter x86 specific.
>>>
>>> I'd recommend not to - even if ARM doesn't want to use it, it's still a
>>> pretty generic thing.
>> 
>> ARM calls these "SGIs" (Software Generated Is), but I suppose I don't mind
>> keeping the #IPIS around and generic though.
> 
> With this patch the only usage of #IPIS is in arch/x86. It will confuse
> the user because #IPIs will always be 0 on ARM.

There are quite a few counters which will (perhaps under some
conditions) remain to be zero.

> So I don't see any point to keep the definition common.

I think "IPI" is a generic enough concept (and afaia not one
introduced through x86, not even just its name) to allow for
possible future ports to use this.

Jan


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