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Subject: Re: [RFC 02/11] perf/core: Data structure to present hazard data
To: Mark Rutland <mark.rutland@arm.com>
References: <20200302052355.36365-1-ravi.bangoria@linux.ibm.com>
 <20200302052355.36365-3-ravi.bangoria@linux.ibm.com>
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From: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Date: Tue, 3 Mar 2020 20:02:58 +0530
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Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>, ak@linux.intel.com,
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On 3/2/20 8:18 PM, Mark Rutland wrote:
>> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
>> index 377d794d3105..ff252618ca93 100644
>> --- a/include/uapi/linux/perf_event.h
>> +++ b/include/uapi/linux/perf_event.h
>> @@ -142,8 +142,9 @@ enum perf_event_sample_format {
>>   	PERF_SAMPLE_REGS_INTR			= 1U << 18,
>>   	PERF_SAMPLE_PHYS_ADDR			= 1U << 19,
>>   	PERF_SAMPLE_AUX				= 1U << 20,
>> +	PERF_SAMPLE_PIPELINE_HAZ		= 1U << 21,
> 
> Can we please have perf_event_open() reject this sample flag for PMUs
> without the new callback (introduced in the next patch)?
> 
> That way it'll be possible to detect whether the PMU exposes this.

Sure. Will change it.

Ravi