Re: [RFC PATCH] perf: Provide status of known PMUs

[Ingo Molnar]

* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> On Thu, Jul 09, 2015 at 10:48:00AM +0300, Adrian Hunter wrote:
>
> > Known PMUs may not be present for various reasons. Provide a way for the user 
> > to know what the reason is.
> 
> Not a bad idea, but I do wonder where we should draw the line on what is 
> 'known'. The patch as proposed will have bts/pt listed as 'known' for every arch 
> out there.
> 
> By that logic, x86 should list the ppc/sparc/mips/arm/etc.. PMUs as known and 
> wrong_arch too, which might be a tad excessive.

Absolutely x86 should list them as well - from a user POV arch dependent tooling 
sucks in general. There's nothing more annoying than trying to figure out why a 
particular tool does not work.

If memory usage becomes any concern in the future we can list them in a bit more 
compressed form.

Thanks,

	Ingo
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