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

From: James Clark
Date: Mon Nov 08 2021 - 15:40:06 EST




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

Reviewed-by: James Clark <james.clark@xxxxxxx>
> ---
> 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;
>