linux-kernel - Re: [V3 01/10] perf: New conditional branch filter criteria in branch stack sampling

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Message-ID: <529DB092.8010307@linux.vnet.ibm.com>
Date:	Tue, 03 Dec 2013 15:51:06 +0530
From:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:	"mpe@...erman.id.au" <michael@...abs.org>
CC:	mikey@...ling.org, michaele@....ibm.com,
	linux-kernel@...r.kernel.org, eranian@...gle.com,
	linuxppc-dev@...abs.org, sukadev@...ux.vnet.ibm.com
Subject: Re: [V3 01/10] perf: New conditional branch filter criteria in branch
 stack sampling

On 11/26/2013 03:45 PM, Anshuman Khandual wrote:
> On 11/26/2013 11:36 AM, mpe@...erman.id.au wrote:
>> Ideally your commit subject would contain a verb, preferably in the present
>> tense.
>>
>> I think simply "perf: Add PERF_SAMPLE_BRANCH_COND" would be clearer.
> 
> 
> Sure, will change it.
> 
>>
>> On Wed, 2013-16-10 at 06:56:48 UTC, Anshuman Khandual wrote:
>>> POWER8 PMU based BHRB supports filtering for conditional branches.
>>> This patch introduces new branch filter PERF_SAMPLE_BRANCH_COND which
>>> will extend the existing perf ABI. Other architectures can provide
>>> this functionality with either HW filtering support (if present) or
>>> with SW filtering of instructions.
>>>
>>> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
>>> Reviewed-by: Stephane Eranian <eranian@...gle.com>
>>> ---
>>>  include/uapi/linux/perf_event.h | 3 ++-
>>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
>>> index 0b1df41..5da52b6 100644
>>> --- 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_TX	= 1U << 7, /* transaction aborts */
>>>  	PERF_SAMPLE_BRANCH_IN_TX	= 1U << 8, /* in transaction */
>>>  	PERF_SAMPLE_BRANCH_NO_TX	= 1U << 9, /* not in transaction */
>>> +	PERF_SAMPLE_BRANCH_COND		= 1U << 10, /* conditional branches */
>>>  
>>> -	PERF_SAMPLE_BRANCH_MAX		= 1U << 10, /* non-ABI */
>>> +	PERF_SAMPLE_BRANCH_MAX		= 1U << 11, /* non-ABI */
>>>  };
>>
>> This no longer applies against Linus' tree, you'll need to rebase it.
> 
> Okay

Hey Michael,

Looks like the patch still applies on top of Linus's tree. The modified patch with
a new commit subject line can be found here.

----------------------------------------------------------------------
>From d368096fc51a8da65f2d80ed5090d43cbc269f62 Mon Sep 17 00:00:00 2001
From: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Date: Mon, 22 Jul 2013 12:22:27 +0530
Subject: [PATCH] perf: Add PERF_SAMPLE_BRANCH_COND

POWER8 PMU based BHRB supports filtering for conditional branches.
This patch introduces new branch filter PERF_SAMPLE_BRANCH_COND which
will extend the existing perf ABI. Other architectures can provide
this functionality with either HW filtering support (if present) or
with SW filtering of instructions.

Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Reviewed-by: Stephane Eranian <eranian@...gle.com>
---
 include/uapi/linux/perf_event.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index e1802d6..e2d8b8b 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -163,8 +163,9 @@ enum perf_branch_sample_type {
 	PERF_SAMPLE_BRANCH_ABORT_TX	= 1U << 7, /* transaction aborts */
 	PERF_SAMPLE_BRANCH_IN_TX	= 1U << 8, /* in transaction */
 	PERF_SAMPLE_BRANCH_NO_TX	= 1U << 9, /* not in transaction */
+	PERF_SAMPLE_BRANCH_COND		= 1U << 10, /* conditional branches */
 
-	PERF_SAMPLE_BRANCH_MAX		= 1U << 10, /* non-ABI */
+	PERF_SAMPLE_BRANCH_MAX		= 1U << 11, /* non-ABI */
 };
 
 #define PERF_SAMPLE_BRANCH_PLM_ALL \
-- 
1.7.11.7

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