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

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Date:	Tue, 26 Nov 2013 15:45:35 +0530
From:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:	"mpe@...erman.id.au" <michael@...abs.org>
CC:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	mikey@...ling.org, sukadev@...ux.vnet.ibm.com, eranian@...gle.com,
	michaele@....ibm.com
Subject: Re: [V3 01/10] perf: New conditional branch filter criteria in branch
 stack sampling

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

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