Messages in this thread | | | Subject | Re: [PATCH] perf report: Set PERF_SAMPLE_DATA_SRC bit for Arm SPE event | From | German Gomez <> | Date | Wed, 13 Apr 2022 09:15:40 +0100 |
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Hi Leo,
On 13/04/2022 08:51, Leo Yan wrote: > Since commit bb30acae4c4d ("perf report: Bail out --mem-mode if mem info > is not available") "perf mem report" and "perf report --mem-mode" > don't report result if the PERF_SAMPLE_DATA_SRC bit is missed in sample > type. > > The commit ffab48705205 ("perf: arm-spe: Fix perf report --mem-mode") > partially fixes the issue. It adds PERF_SAMPLE_DATA_SRC bit for Arm SPE > event, this allows the perf data file generated by kernel v5.18-rc1 or > later version can be reported properly. > > On the other hand, perf tool still fails to be backward compatibility > for a data file recorded by an older version's perf which contains Arm > SPE trace data. This patch is a workaround in reporting phase, when > detects ARM SPE PMU event and without PERF_SAMPLE_DATA_SRC bit, it will > force to set the bit in the sample type and give a warning info. > > Fixes: bb30acae4c4d ("perf report: Bail out --mem-mode if mem info is not available") > Signed-off-by: Leo Yan <leo.yan@linaro.org> > --- > tools/perf/builtin-report.c | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c > index 1ad75c7ba074..f26dd14eb852 100644 > --- a/tools/perf/builtin-report.c > +++ b/tools/perf/builtin-report.c > @@ -353,6 +353,7 @@ static int report__setup_sample_type(struct report *rep) > struct perf_session *session = rep->session; > u64 sample_type = evlist__combined_sample_type(session->evlist); > bool is_pipe = perf_data__is_pipe(session->data); > + struct evsel *evsel; > > if (session->itrace_synth_opts->callchain || > session->itrace_synth_opts->add_callchain || > @@ -407,6 +408,21 @@ static int report__setup_sample_type(struct report *rep) > } > > if (sort__mode == SORT_MODE__MEMORY) { > + /* > + * FIXUP: prior to kernel 5.18, Arm SPE missed to set > + * PERF_SAMPLE_DATA_SRC bit in sample type. For backward > + * compatibility, set the bit if it's an old perf data file. > + */ > + evlist__for_each_entry(session->evlist, evsel) { > + if (strstr(evsel->name, "arm_spe_") &&
This didn't work for me when the file recorded "-e arm_spe//" instead of "-e arm_spe_0//". Could you remove the trailing _? With that:
Tested-by: German Gomez <german.gomez@arm.com>
> + !(sample_type & PERF_SAMPLE_DATA_SRC)) { > + ui__warning("PERF_SAMPLE_DATA_SRC bit is not set " > + "for Arm SPE event.\n"); > + evsel->core.attr.sample_type |= PERF_SAMPLE_DATA_SRC; > + sample_type |= PERF_SAMPLE_DATA_SRC; > + } > + } > + > if (!is_pipe && !(sample_type & PERF_SAMPLE_DATA_SRC)) { > ui__error("Selected --mem-mode but no mem data. " > "Did you call perf record without -d?\n");
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