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

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Message-ID: <CABPqkBSECV6iG4T60-OTZsV2CrCtV=awUSt7SGLTdkX9i8T90g@mail.gmail.com>
Date:	Wed, 26 Feb 2014 08:04:00 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	"Yan, Zheng" <zheng.z.yan@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support

On Wed, Feb 26, 2014 at 3:39 AM, Andy Lutomirski <luto@...capital.net> wrote:
> On 02/17/2014 10:07 PM, Yan, Zheng wrote:
>>
>> This patch series adds LBR call stack support. User can enabled/disable
>> this through an sysfs attribute file in the CPU PMU directory:
>>  echo 1 > /sys/bus/event_source/devices/cpu/lbr_callstack
>
> This seems like an unpleasant way to control this.  It would be handy to
> be able to control this as an option to perf record.
>
That would mean you'd be root for perf.
Or are you suggesting a perf event option? But then, you'd expose arch-specific
feature at the API level.

> --Andy
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