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perf intel-pt: Track sideband system-wide when needed 

User space tasks can migrate between CPUs, so when tracing selected CPUs,
sideband for all CPUs is still needed. This is in preparation for allowing
system-wide events on all CPUs while the user requested events are on only
user requested CPUs.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Link: https://lore.kernel.org/r/20220524075436.29144-9-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2022-05-24 10:54:29 +03:00 committed by Arnaldo Carvalho de Melo
parent e665c82a76
commit 7d189cadbe
1 changed files with 10 additions and 8 deletions
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18
tools/perf/arch/x86/util/intel-pt.c
View File

@ -864,20 +864,22 @@ static int intel_pt_recording_options(struct auxtrace_record *itr,
/* Add dummy event to keep tracking */
if (opts->full_auxtrace) {
bool need_system_wide_tracking;
struct evsel *tracking_evsel;
err = parse_events(evlist, "dummy:u", NULL);
if (err)
return err;
/*
* User space tasks can migrate between CPUs, so when tracing
* selected CPUs, sideband for all CPUs is still needed.
*/
need_system_wide_tracking = evlist->core.has_user_cpus &&
!intel_pt_evsel->core.attr.exclude_user;
tracking_evsel = evlist__last(evlist);
tracking_evsel = evlist__add_aux_dummy(evlist, need_system_wide_tracking);
if (!tracking_evsel)
return -ENOMEM;
evlist__set_tracking_event(evlist, tracking_evsel);
tracking_evsel->core.attr.freq = 0;
tracking_evsel->core.attr.sample_period = 1;
tracking_evsel->no_aux_samples = true;
if (need_immediate)
tracking_evsel->immediate = true;