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

* Andy Lutomirski <luto@amacapital.net> wrote:

> On Wed, Feb 26, 2014 at 10:55 AM, Andi Kleen <andi@firstfloor.org> 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@kernel.org>

> > [...] 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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