linux-kernel - Re: [PATCH 1/6] perf, x86: Basic Haswell LBR call stack support

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Message-ID: <CABPqkBSzh1K5eDsnmrQdE9=YEkctvqLgfEyQe7wnS9ZbNqt9-Q@mail.gmail.com>
Date:	Tue, 23 Oct 2012 14:09:05 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [PATCH 1/6] perf, x86: Basic Haswell LBR call stack support

On Tue, Oct 23, 2012 at 7:41 AM, Yan, Zheng <zheng.z.yan@...el.com> wrote:
> On 10/22/2012 06:35 PM, Peter Zijlstra wrote:
>> On Mon, 2012-10-22 at 14:11 +0800, Yan, Zheng wrote:
>>> --- a/include/uapi/linux/perf_event.h
>>> +++ b/include/uapi/linux/perf_event.h
>>> @@ -160,8 +160,9 @@ enum perf_branch_sample_type {
>>>         PERF_SAMPLE_BRANCH_ABORT        = 1U << 7, /* transaction aborts */
>>>         PERF_SAMPLE_BRANCH_INTX         = 1U << 8, /* in transaction (flag) */
>>>         PERF_SAMPLE_BRANCH_NOTX         = 1U << 9, /* not in transaction (flag) */
>>> +       PERF_SAMPLE_BRANCH_CALL_STACK   = 1U << 10, /* call stack */
>>>
>>> -       PERF_SAMPLE_BRANCH_MAX          = 1U << 10, /* non-ABI */
>>> +       PERF_SAMPLE_BRANCH_MAX          = 1U << 11, /* non-ABI */
>>>  };
>>
>> You add an ABI sample type without mentioning it in your changelog.. I
>> think I'll stop reading here.
>>
> Ok, I will add the ABI change to the change log. Do you think we should hide this
> branch sample type from user?
>
Certainly not. what's the point of this?
Unless, it is so broken that it does not work at all.

> Regards
> Yan, Zheng
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