[PATCH 17/21] perf script: Add support to display user data events

Jiri Olsa
2018-01-24T11:54:10Z

Adding option to display user data events:

$ perf script -F +misc,+tid --show-userdata-events ...

sched-messaging 1410 KD 28690.634993: 2164 cycles:ppp: ffffffff8985bb70 nmi_res ...
sched-messaging 1410 KD 28690.635003: 8920 cycles:ppp: ffffffff891b5e70 __perf_ ...
sched-messaging 1410 28690.635043: PERF_RECORD_USER_DATA type 0x20 (callchain)
sched-messaging 1407 KD 28690.635117: 319262 cycles:ppp: ffffffff89206c3c copy_pa ...
sched-messaging 1407 28690.635226: PERF_RECORD_USER_DATA type 0x20 (callchain)
sched-messaging 1411 KD 28690.635318: 1 cycles:ppp: ffffffff8905aa54 native_ ...

Link: http://lkml.kernel.org/n/tip-ozg2qt7ofv69e1hddxwuf0hp@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/builtin-script.c | 85 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 85 insertions(+)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index ab19a6ee4093..2b8231292fe2 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1489,6 +1489,7 @@ struct perf_script {
bool show_switch_events;
bool show_namespace_events;
bool show_lost_events;
+ bool show_userdata_events;
bool allocated;
bool per_event_dump;
struct cpu_map *cpus;
@@ -2104,6 +2105,85 @@ process_lost_event(struct perf_tool *tool,
return 0;
}

+static size_t
+perf_event__fprintf_user_data(union perf_event *event,
+ struct perf_sample *sample,
+ struct perf_evsel *evsel,
+ struct perf_script *script,
+ FILE *fp)
+{
+ const char *evname = perf_evsel__name(evsel);
+ u64 type = event->user_data.type;
+ bool single = true;
+ size_t printed = 0;
+
+ printed += fprintf(fp, "PERF_RECORD_%s ",
+ perf_event__name(event->header.type));
+
+ if (!script->name_width)
+ script->name_width = perf_evlist__max_name_len(script->session->evlist);
+
+ printed += fprintf(fp, "%*s: ", script->name_width, evname ?: "[unknown]");
+
+ printed += fprintf(fp, " id %lu, type 0x%lx (",
+ sample->user_data_id, event->user_data.type);
+
+ if (type & PERF_SAMPLE_CALLCHAIN) {
+ printed += fprintf(fp, "callchain");
+ single = false;
+ }
+
+ if (type & PERF_SAMPLE_STACK_USER) {
+ printed += fprintf(fp, "%sstack", !single ? "," : "");
+ single = false;
+ }
+
+ if (type & PERF_SAMPLE_USER_DATA_ID)
+ printed += fprintf(fp, "%sid", !single ? "," : "");
+
+ printed += fprintf(fp, ")\n");
+ return printed;
+}
+
+static int
+process_user_data_event(struct perf_tool *tool __maybe_unused,
+ union perf_event *event __maybe_unused,
+ struct perf_sample *sample,
+ struct perf_evsel *evsel,
+ struct machine *machine)
+{
+ struct perf_script *script = container_of(tool, struct perf_script, tool);
+ struct perf_event_attr *attr = &evsel->attr;
+ unsigned int type = output_type(attr->type);
+ struct thread *thread;
+
+ thread = machine__findnew_thread(machine, sample->pid,
+ sample->tid);
+ if (thread == NULL)
+ return -1;
+
+ perf_sample__fprintf_start(sample, thread, evsel,
+ PERF_RECORD_SAMPLE, stdout);
+ perf_event__fprintf_user_data(event, sample, evsel, script, stdout);
+
+ if (PRINT_FIELD(IP)) {
+ struct callchain_cursor *cursor = NULL;
+
+ if (symbol_conf.use_callchain && sample->callchain &&
+ thread__resolve_callchain(thread, &callchain_cursor, evsel,
+ sample, NULL, NULL, scripting_max_stack) == 0)
+ cursor = &callchain_cursor;
+
+ if (cursor) {
+ sample__fprintf_callchain(sample, 0, output[type].print_ip_opts, cursor, stdout);
+ fprintf(stdout, "\n");
+ }
+ }
+
+ thread__put(thread);
+ return 0;
+}
+
static void sig_handler(int sig __maybe_unused)
{
session_done = 1;
@@ -2200,6 +2280,9 @@ static int __cmd_script(struct perf_script *script)
script->tool.namespaces = process_namespaces_event;
if (script->show_lost_events)
script->tool.lost = process_lost_event;
+ if (script->show_userdata_events)
+ script->tool.user_data = process_user_data_event;
+

if (perf_script__setup_per_event_dump(script)) {
pr_err("Couldn't create the per event dump files\n");
@@ -3139,6 +3222,8 @@ int cmd_script(int argc, const char **argv)
"Show namespace events (if recorded)"),
OPT_BOOLEAN('\0', "show-lost-events", &script.show_lost_events,
"Show lost events (if recorded)"),
+ OPT_BOOLEAN('\0', "show-userdata-events", &script.show_userdata_events,
+ "Show userdata events (if recorded)"),
OPT_BOOLEAN('\0', "per-event-dump", &script.per_event_dump,
"Dump trace output to files named by the monitored events"),
OPT_BOOLEAN('f', "force", &symbol_conf.force, "don't complain, do it"),
--
2.13.6