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perf callchains: Ask for PERF_RECORD_MMAP for data mmaps for DWARF unwinding
When we use a global DWARF setting as in:
perf record --call-graph dwarf
According to 5c0cf22477
("perf record: Store data mmaps for dwarf unwind") we need
to set up some extra perf_event_attr bits.
But when we instead do a per event dwarf setting:
perf record -e cycles/call-graph=dwarf/
This was not being done, make them equivalent.
This didn't produce any output changes in my tests while fixing up loose
ends in the per-event settings, I found it just by comparing the
perf_event_attr fields trying to find an explanation for those problems.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Hendrick Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Noel Grandin <noelgrandin@gmail.com>
Cc: Thomas Richter <tmricht@linux.vnet.ibm.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-6476r53h2o38skbs9qa4ust4@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -726,7 +726,7 @@ perf_evsel__reset_callgraph(struct perf_evsel *evsel,
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}
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static void apply_config_terms(struct perf_evsel *evsel,
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struct record_opts *opts)
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struct record_opts *opts, bool track)
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{
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struct perf_evsel_config_term *term;
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struct list_head *config_terms = &evsel->config_terms;
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@ -797,6 +797,8 @@ static void apply_config_terms(struct perf_evsel *evsel,
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/* User explicitly set per-event callgraph, clear the old setting and reset. */
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if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
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bool sample_address = false;
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if (max_stack) {
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param.max_stack = max_stack;
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if (callgraph_buf == NULL)
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@ -816,6 +818,8 @@ static void apply_config_terms(struct perf_evsel *evsel,
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evsel->name);
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return;
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}
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if (param.record_mode == CALLCHAIN_DWARF)
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sample_address = true;
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}
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}
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if (dump_size > 0) {
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@ -828,8 +832,14 @@ static void apply_config_terms(struct perf_evsel *evsel,
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perf_evsel__reset_callgraph(evsel, &callchain_param);
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/* set perf-event callgraph */
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if (param.enabled)
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if (param.enabled) {
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if (sample_address) {
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perf_evsel__set_sample_bit(evsel, ADDR);
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perf_evsel__set_sample_bit(evsel, DATA_SRC);
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evsel->attr.mmap_data = track;
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}
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perf_evsel__config_callchain(evsel, opts, ¶m);
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}
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}
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}
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@ -1060,7 +1070,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
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* Apply event specific term settings,
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* it overloads any global configuration.
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*/
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apply_config_terms(evsel, opts);
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apply_config_terms(evsel, opts, track);
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evsel->ignore_missing_thread = opts->ignore_missing_thread;
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}
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