linux-kernel - Re: [PATCH 1/1] perf arm-spe: Inject SPE samples in perf-inject

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Date:   Mon, 8 Nov 2021 20:39:58 +0000
From:   James Clark <james.clark@....com>
To:     German Gomez <german.gomez@....com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, acme@...nel.org
Cc:     John Garry <john.garry@...wei.com>, Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/1] perf arm-spe: Inject SPE samples in perf-inject



On 05/11/2021 10:41, German Gomez wrote:
> Inject synthesized SPE samples during perf-inject run.
> 
> Signed-off-by: German Gomez <german.gomez@....com>

Reviewed-by: James Clark <james.clark@....com>
> ---
>  tools/perf/util/arm-spe.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c
> index 58b7069c5..7054f2315 100644
> --- a/tools/perf/util/arm-spe.c
> +++ b/tools/perf/util/arm-spe.c
> @@ -51,6 +51,7 @@ struct arm_spe {
>  	u8				timeless_decoding;
>  	u8				data_queued;
>  
> +	u64				sample_type;
>  	u8				sample_flc;
>  	u8				sample_llc;
>  	u8				sample_tlb;
> @@ -248,6 +249,12 @@ static void arm_spe_prep_sample(struct arm_spe *spe,
>  	event->sample.header.size = sizeof(struct perf_event_header);
>  }
>  
> +static int arm_spe__inject_event(union perf_event *event, struct perf_sample *sample, u64 type)
> +{
> +	event->header.size = perf_event__sample_event_size(sample, type, 0);
> +	return perf_event__synthesize_sample(event, type, 0, sample);
> +}
> +
>  static inline int
>  arm_spe_deliver_synth_event(struct arm_spe *spe,
>  			    struct arm_spe_queue *speq __maybe_unused,
> @@ -256,6 +263,12 @@ arm_spe_deliver_synth_event(struct arm_spe *spe,
>  {
>  	int ret;
>  
> +	if (spe->synth_opts.inject) {
> +		ret = arm_spe__inject_event(event, sample, spe->sample_type);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	ret = perf_session__deliver_synth_event(spe->session, event, sample);
>  	if (ret)
>  		pr_err("ARM SPE: failed to deliver event, error %d\n", ret);
> @@ -920,6 +933,8 @@ arm_spe_synth_events(struct arm_spe *spe, struct perf_session *session)
>  	else
>  		attr.sample_type |= PERF_SAMPLE_TIME;
>  
> +	spe->sample_type = attr.sample_type;
> +
>  	attr.exclude_user = evsel->core.attr.exclude_user;
>  	attr.exclude_kernel = evsel->core.attr.exclude_kernel;
>  	attr.exclude_hv = evsel->core.attr.exclude_hv;
>