[PATCH v3 4/5] perf script: Display PERF_RECORD_CALLCHAIN_DEFERRED

[Namhyung Kim <namhyung@kernel.org>]

Handle the deferred callchains in the script output.

  $ perf script
  ...
  pwd    2312   121.163435:     249113 cpu/cycles/P:
          ffffffff845b78d8 __build_id_parse.isra.0+0x218 ([kernel.kallsyms])
          ffffffff83bb5bf6 perf_event_mmap+0x2e6 ([kernel.kallsyms])
          ffffffff83c31959 mprotect_fixup+0x1e9 ([kernel.kallsyms])
          ffffffff83c31dc5 do_mprotect_pkey+0x2b5 ([kernel.kallsyms])
          ffffffff83c3206f __x64_sys_mprotect+0x1f ([kernel.kallsyms])
          ffffffff845e6692 do_syscall_64+0x62 ([kernel.kallsyms])
          ffffffff8360012f entry_SYSCALL_64_after_hwframe+0x76 ([kernel.kallsyms])
                 b00000006 [unknown] ([unknown])

  pwd    2312   121.163447: DEFERRED CALLCHAIN
              7f18fe337fa7 mprotect+0x7 (/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
              7f18fe330e0f _dl_sysdep_start+0x7f (/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
              7f18fe331448 _dl_start_user+0x0 (/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/builtin-script.c | 89 +++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index cf0040bbaba9cbc9..3b2896350bad2924 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -2719,6 +2719,93 @@ static int process_sample_event(const struct perf_tool *tool,
 	return ret;
 }
 
+static int process_deferred_sample_event(const struct perf_tool *tool,
+					 union perf_event *event,
+					 struct perf_sample *sample,
+					 struct evsel *evsel,
+					 struct machine *machine)
+{
+	struct perf_script *scr = container_of(tool, struct perf_script, tool);
+	struct perf_event_attr *attr = &evsel->core.attr;
+	struct evsel_script *es = evsel->priv;
+	unsigned int type = output_type(attr->type);
+	struct addr_location al;
+	FILE *fp = es->fp;
+	int ret = 0;
+
+	if (output[type].fields == 0)
+		return 0;
+
+	/* Set thread to NULL to indicate addr_al and al are not initialized */
+	addr_location__init(&al);
+
+	if (perf_time__ranges_skip_sample(scr->ptime_range, scr->range_num,
+					  sample->time)) {
+		goto out_put;
+	}
+
+	if (debug_mode) {
+		if (sample->time < last_timestamp) {
+			pr_err("Samples misordered, previous: %" PRIu64
+				" this: %" PRIu64 "\n", last_timestamp,
+				sample->time);
+			nr_unordered++;
+		}
+		last_timestamp = sample->time;
+		goto out_put;
+	}
+
+	if (filter_cpu(sample))
+		goto out_put;
+
+	if (machine__resolve(machine, &al, sample) < 0) {
+		pr_err("problem processing %d event, skipping it.\n",
+		       event->header.type);
+		ret = -1;
+		goto out_put;
+	}
+
+	if (al.filtered)
+		goto out_put;
+
+	if (!show_event(sample, evsel, al.thread, &al, NULL))
+		goto out_put;
+
+	if (evswitch__discard(&scr->evswitch, evsel))
+		goto out_put;
+
+	perf_sample__fprintf_start(scr, sample, al.thread, evsel,
+				   PERF_RECORD_CALLCHAIN_DEFERRED, fp);
+	fprintf(fp, "DEFERRED CALLCHAIN");
+
+	if (PRINT_FIELD(IP)) {
+		struct callchain_cursor *cursor = NULL;
+
+		if (symbol_conf.use_callchain && sample->callchain) {
+			cursor = get_tls_callchain_cursor();
+			if (thread__resolve_callchain(al.thread, cursor, evsel,
+						      sample, NULL, NULL,
+						      scripting_max_stack)) {
+				pr_info("cannot resolve deferred callchains\n");
+				cursor = NULL;
+			}
+		}
+
+		fputc(cursor ? '\n' : ' ', fp);
+		sample__fprintf_sym(sample, &al, 0, output[type].print_ip_opts,
+				    cursor, symbol_conf.bt_stop_list, fp);
+	}
+
+	fprintf(fp, "\n");
+
+	if (verbose > 0)
+		fflush(fp);
+
+out_put:
+	addr_location__exit(&al);
+	return ret;
+}
+
 // Used when scr->per_event_dump is not set
 static struct evsel_script es_stdout;
 
@@ -4320,6 +4407,7 @@ int cmd_script(int argc, const char **argv)
 
 	perf_tool__init(&script.tool, !unsorted_dump);
 	script.tool.sample		 = process_sample_event;
+	script.tool.callchain_deferred	 = process_deferred_sample_event;
 	script.tool.mmap		 = perf_event__process_mmap;
 	script.tool.mmap2		 = perf_event__process_mmap2;
 	script.tool.comm		 = perf_event__process_comm;
@@ -4346,6 +4434,7 @@ int cmd_script(int argc, const char **argv)
 	script.tool.throttle		 = process_throttle_event;
 	script.tool.unthrottle		 = process_throttle_event;
 	script.tool.ordering_requires_timestamps = true;
+	script.tool.merge_deferred_callchains = false;
 	session = perf_session__new(&data, &script.tool);
 	if (IS_ERR(session))
 		return PTR_ERR(session);
-- 
2.52.0.rc1.455.g30608eb744-goog