Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support

[Ingo Molnar]

* Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:

> On Wed, Feb 26, 2014 at 10:55 AM, Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
>
> >> I'm suggesting a perf event option, just like the way that PEBS 
> >> works.
> >
> > Right now it's a somewhat experimental feature and just having the 
> > sysctl is fine. [...]

NACKed-by: Ingo Molnar <mingo@xxxxxxxxxx>

> > [...] If it turns out that is what everyone uses such an option 
> > could be still added later.
> 
> I'm a bit worried that the syscall will be stuck as ABI forever, 
> though.  Its presence will make adding a different configuration 
> mechanism awkward.

The sysctl is a usability non-starter, obviously.

Thanks,

	Ingo
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