linux-kernel - Re: [RFC 02/11] perf/core: Data structure to present hazard data

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Date:   Tue, 3 Mar 2020 20:02:58 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        eranian@...gle.com, peterz@...radead.org, mpe@...erman.id.au,
        paulus@...ba.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, adrian.hunter@...el.com, ak@...ux.intel.com,
        kan.liang@...ux.intel.com, alexey.budankov@...ux.intel.com,
        yao.jin@...ux.intel.com, robert.richter@....com,
        kim.phillips@....com, maddy@...ux.ibm.com,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: Re: [RFC 02/11] perf/core: Data structure to present hazard data


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