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

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Message-ID: <20140227123507.GB11475@gmail.com>
Date:	Thu, 27 Feb 2014 13:35:07 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support


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

> On Wed, Feb 26, 2014 at 10:55 AM, Andi Kleen <andi@...stfloor.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@...nel.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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