perf record: Generate tracking events for process forked by perf (be7b0c9e) · Commits · 戴 / test

With 'perf record --switch-output' without -a, record__synthesize() in record__switch_output() won't generate tracking events because there's no thread_map in evlist. Which causes newly created perf.data doesn't contain map and comm information. This patch creates a fake thread_map and directly call perf_event__synthesize_thread_map() for those events. Signed-off-by:

Wang Nan <wangnan0@huawei.com> Tested-by:

Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1461178794-40467-8-git-send-email-wangnan0@huawei.com Signed-off-by:

He Kuang <hekuang@huawei.com> Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-record.c

+30 −1

Original line number	Diff line number	Diff line
		@@ -500,6 +500,23 @@ record__finish_output(struct record *rec)
		return;
		}

		static int record__synthesize_workload(struct record *rec)
		{
		struct {
		struct thread_map map;
		struct thread_map_data map_data;
		} thread_map;

		thread_map.map.nr = 1;
		thread_map.map.map[0].pid = rec->evlist->workload.pid;
		thread_map.map.map[0].comm = NULL;
		return perf_event__synthesize_thread_map(&rec->tool, &thread_map.map,
		process_synthesized_event,
		&rec->session->machines.host,
		rec->opts.sample_address,
		rec->opts.proc_map_timeout);
		}

		static int record__synthesize(struct record *rec);

		static int
		@@ -532,9 +549,21 @@ record__switch_output(struct record *rec, bool at_exit)
		file->path, timestamp);

		/* Output tracking events */
		if (!at_exit)
		if (!at_exit) {
		record__synthesize(rec);

		/*
		* In 'perf record --switch-output' without -a,
		* record__synthesize() in record__switch_output() won't
		* generate tracking events because there's no thread_map
		* in evlist. Which causes newly created perf.data doesn't
		* contain map and comm information.
		* Create a fake thread_map and directly call
		* perf_event__synthesize_thread_map() for those events.
		*/
		if (target__none(&rec->opts.target))
		record__synthesize_workload(rec);
		}
		return fd;
		}

Admin message