linux-kernel - Re: [PATCH v2] perf tools: Add SPE total latency as PERF_SAMPLE

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Date:   Thu, 9 Dec 2021 16:07:35 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        James Clark <james.clark@....com>,
        German Gomez <german.gomez@....com>,
        Mark Rutland <mark.rutland@....com>,
        Leo Yan <leo.yan@...aro.org>
Subject: Re: [PATCH v2] perf tools: Add SPE total latency as
 PERF_SAMPLE_WEIGHT

Em Wed, Dec 01, 2021 at 02:08:55PM -0800, Namhyung Kim escreveu:
> Use total latency info in the SPE counter packet as sample weight so
> that we can see it in local_weight and (global) weight sort keys.
> 
> Maybe we can use PERF_SAMPLE_WEIGHT_STRUCT to support ins_lat as well
> but I'm not sure which latency it matches.  So just adding total
> latency first.

Thanks, applied.

- Arnaldo

 
> Cc: German Gomez <german.gomez@....com>
> Cc: Mark Rutland <mark.rutland@....com>
> Reviewed-by: Leo Yan <leo.yan@...aro.org>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/arm-spe-decoder/arm-spe-decoder.c | 2 ++
>  tools/perf/util/arm-spe-decoder/arm-spe-decoder.h | 1 +
>  tools/perf/util/arm-spe.c                         | 5 ++++-
>  3 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
> index 3fc528c9270c..5e390a1a79ab 100644
> --- a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
> +++ b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
> @@ -179,6 +179,8 @@ static int arm_spe_read_record(struct arm_spe_decoder *decoder)
>  				decoder->record.phys_addr = ip;
>  			break;
>  		case ARM_SPE_COUNTER:
> +			if (idx == SPE_CNT_PKT_HDR_INDEX_TOTAL_LAT)
> +				decoder->record.latency = payload;
>  			break;
>  		case ARM_SPE_CONTEXT:
>  			decoder->record.context_id = payload;
> diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.h b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.h
> index 46a8556a9e95..69b31084d6be 100644
> --- a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.h
> +++ b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.h
> @@ -33,6 +33,7 @@ struct arm_spe_record {
>  	enum arm_spe_sample_type type;
>  	int err;
>  	u32 op;
> +	u32 latency;
>  	u64 from_ip;
>  	u64 to_ip;
>  	u64 timestamp;
> diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c
> index 4748bcfe61de..82c08f2a60d0 100644
> --- a/tools/perf/util/arm-spe.c
> +++ b/tools/perf/util/arm-spe.c
> @@ -317,6 +317,7 @@ static int arm_spe__synth_mem_sample(struct arm_spe_queue *speq,
>  	sample.addr = record->virt_addr;
>  	sample.phys_addr = record->phys_addr;
>  	sample.data_src = data_src;
> +	sample.weight = record->latency;
>  
>  	return arm_spe_deliver_synth_event(spe, speq, event, &sample);
>  }
> @@ -334,6 +335,7 @@ static int arm_spe__synth_branch_sample(struct arm_spe_queue *speq,
>  	sample.id = spe_events_id;
>  	sample.stream_id = spe_events_id;
>  	sample.addr = record->to_ip;
> +	sample.weight = record->latency;
>  
>  	return arm_spe_deliver_synth_event(spe, speq, event, &sample);
>  }
> @@ -980,7 +982,8 @@ arm_spe_synth_events(struct arm_spe *spe, struct perf_session *session)
>  	attr.type = PERF_TYPE_HARDWARE;
>  	attr.sample_type = evsel->core.attr.sample_type & PERF_SAMPLE_MASK;
>  	attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
> -			    PERF_SAMPLE_PERIOD | PERF_SAMPLE_DATA_SRC;
> +			    PERF_SAMPLE_PERIOD | PERF_SAMPLE_DATA_SRC |
> +			    PERF_SAMPLE_WEIGHT;
>  	if (spe->timeless_decoding)
>  		attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
>  	else
> -- 
> 2.34.0.384.gca35af8252-goog

-- 

- Arnaldo