diff options
Diffstat (limited to 'tools/perf/util/evsel.c')
| -rw-r--r-- | tools/perf/util/evsel.c | 41 |
1 files changed, 30 insertions, 11 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index adc94dd1794d..26b67b11c65b 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -500,6 +500,34 @@ int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size) return ret; } +static void +perf_evsel__config_callgraph(struct perf_evsel *evsel, + struct record_opts *opts) +{ + bool function = perf_evsel__is_function_event(evsel); + struct perf_event_attr *attr = &evsel->attr; + + perf_evsel__set_sample_bit(evsel, CALLCHAIN); + + if (opts->call_graph == CALLCHAIN_DWARF) { + if (!function) { + perf_evsel__set_sample_bit(evsel, REGS_USER); + perf_evsel__set_sample_bit(evsel, STACK_USER); + attr->sample_regs_user = PERF_REGS_MASK; + attr->sample_stack_user = opts->stack_dump_size; + attr->exclude_callchain_user = 1; + } else { + pr_info("Cannot use DWARF unwind for function trace event," + " falling back to framepointers.\n"); + } + } + + if (function) { + pr_info("Disabling user space callchains for function trace event.\n"); + attr->exclude_callchain_user = 1; + } +} + /* * The enable_on_exec/disabled value strategy: * @@ -595,17 +623,8 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts) attr->mmap_data = track; } - if (opts->call_graph_enabled) { - perf_evsel__set_sample_bit(evsel, CALLCHAIN); - - if (opts->call_graph == CALLCHAIN_DWARF) { - perf_evsel__set_sample_bit(evsel, REGS_USER); - perf_evsel__set_sample_bit(evsel, STACK_USER); - attr->sample_regs_user = PERF_REGS_MASK; - attr->sample_stack_user = opts->stack_dump_size; - attr->exclude_callchain_user = 1; - } - } + if (opts->call_graph_enabled) + perf_evsel__config_callgraph(evsel, opts); if (target__has_cpu(&opts->target)) perf_evsel__set_sample_bit(evsel, CPU); |