Commit 5885a202 authored by Ian Rogers's avatar Ian Rogers Committed by Arnaldo Carvalho de Melo

perf evsel: Dummy events never triggers, no need to ask for PERF_SAMPLE_BRANCH_STACK

A dummy event never triggers any actual counter and therefore cannot be
used with branch_stack
Signed-off-by: default avatarIan Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200422173615.59436-1-irogers@google.com
[ split from a larger patch ]
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 8510895b
...@@ -1153,11 +1153,14 @@ void evsel__config(struct evsel *evsel, struct record_opts *opts, ...@@ -1153,11 +1153,14 @@ void evsel__config(struct evsel *evsel, struct record_opts *opts,
} }
/* /*
* A dummy event never triggers any actual counter and therefore
* cannot be used with branch_stack.
*
* For initial_delay, a dummy event is added implicitly. * For initial_delay, a dummy event is added implicitly.
* The software event will trigger -EOPNOTSUPP error out, * The software event will trigger -EOPNOTSUPP error out,
* if BRANCH_STACK bit is set. * if BRANCH_STACK bit is set.
*/ */
if (opts->initial_delay && is_dummy_event(evsel)) if (is_dummy_event(evsel))
evsel__reset_sample_bit(evsel, BRANCH_STACK); evsel__reset_sample_bit(evsel, BRANCH_STACK);
} }
......
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