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

[Peter Zijlstra]

On Thu, Jul 09, 2015 at 11:26:56AM +0200, Ingo Molnar wrote:
> 
> * 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.

But why would the tool care?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/