perf report: Show call graph from reference events
Introduce --show-ref-call-graph for perf report to print reference callgraph for no callgraph event. Here is an example. perf report --show-ref-call-graph --stdio # To display the perf.data header info, please use --header/--header-only options. # # # Total Lost Samples: 0 # # Samples: 5 of event 'cpu/cpu-cycles,call-graph=fp/' # Event count (approx.): 144985 # # Children Self Command Shared Object Symbol # ........ ........ ....... ................ ........................................ # 72.30% 0.00% sleep [kernel.vmlinux] [k] entry_SYSCALL_64_fastpath | ---entry_SYSCALL_64_fastpath | |--22.62%-- __GI___libc_nanosleep --77.38%-- [...] ...... # Samples: 6 of event 'cpu/instructions,call-graph=no/', show reference callgraph # Event count (approx.): 172780 # # Children Self Command Shared Object Symbol # ........ ........ ....... ................ ........................................ # 73.16% 0.00% sleep [kernel.vmlinux] [k] entry_SYSCALL_64_fastpath | ---entry_SYSCALL_64_fastpath | |--31.44%-- __GI___libc_nanosleep --68.56%-- [...] Signed-off-by: Kan Liang <kan.liang@intel.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1439289050-40510-3-git-send-email-kan.liang@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -359,6 +359,17 @@ OPTIONS
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--full-source-path::
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Show the full path for source files for srcline output.
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--show-ref-call-graph::
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When multiple events are sampled, it may not be needed to collect
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callgraphs for all of them. The sample sites are usually nearby,
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and it's enough to collect the callgraphs on a reference event.
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So user can use "call-graph=no" event modifier to disable callgraph
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for other events to reduce the overhead.
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However, perf report cannot show callgraphs for the event which
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disable the callgraph.
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This option extends the perf report to show reference callgraphs,
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which collected by reference event, in no callgraph event.
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include::callchain-overhead-calculation.txt[]
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SEE ALSO
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@ -316,6 +316,11 @@ static size_t hists__fprintf_nr_sample_events(struct hists *hists, struct report
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if (evname != NULL)
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ret += fprintf(fp, " of event '%s'", evname);
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if (symbol_conf.show_ref_callgraph &&
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strstr(evname, "call-graph=no")) {
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ret += fprintf(fp, ", show reference callgraph");
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}
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if (rep->mem_mode) {
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ret += fprintf(fp, "\n# Total weight : %" PRIu64, nr_events);
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ret += fprintf(fp, "\n# Sort order : %s", sort_order ? : default_mem_sort_order);
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@ -740,6 +745,8 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
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itrace_parse_synth_opts),
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OPT_BOOLEAN(0, "full-source-path", &srcline_full_filename,
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"Show full source file name path for source lines"),
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OPT_BOOLEAN(0, "show-ref-call-graph", &symbol_conf.show_ref_callgraph,
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"Show callgraph from reference event"),
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OPT_END()
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};
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struct perf_data_file file = {
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@ -1267,6 +1267,8 @@ static int hists__browser_title(struct hists *hists,
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const char *ev_name = perf_evsel__name(evsel);
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char buf[512];
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size_t buflen = sizeof(buf);
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char ref[30] = " show reference callgraph, ";
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bool enable_ref = false;
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if (symbol_conf.filter_relative) {
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nr_samples = hists->stats.nr_non_filtered_samples;
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@ -1292,10 +1294,13 @@ static int hists__browser_title(struct hists *hists,
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}
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}
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if (symbol_conf.show_ref_callgraph &&
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strstr(ev_name, "call-graph=no"))
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enable_ref = true;
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nr_samples = convert_unit(nr_samples, &unit);
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printed = scnprintf(bf, size,
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"Samples: %lu%c of event '%s', Event count (approx.): %" PRIu64,
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nr_samples, unit, ev_name, nr_events);
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"Samples: %lu%c of event '%s',%sEvent count (approx.): %" PRIu64,
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nr_samples, unit, ev_name, enable_ref ? ref : " ", nr_events);
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if (hists->uid_filter_str)
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@ -1141,7 +1141,12 @@ void hists__output_resort(struct hists *hists, struct ui_progress *prog)
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struct hist_entry *n;
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u64 min_callchain_hits;
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struct perf_evsel *evsel = hists_to_evsel(hists);
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bool use_callchain = evsel ? (evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) : symbol_conf.use_callchain;
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bool use_callchain;
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if (evsel && !symbol_conf.show_ref_callgraph)
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use_callchain = evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN;
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else
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use_callchain = symbol_conf.use_callchain;
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min_callchain_hits = hists->stats.total_period * (callchain_param.min_percent / 100);
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@ -106,7 +106,8 @@ struct symbol_conf {
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filter_relative,
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show_hist_headers,
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branch_callstack,
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has_filter;
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has_filter,
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show_ref_callgraph;
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const char *vmlinux_name,
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*kallsyms_name,
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*source_prefix,
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