Merge branch 'perf/live' into perf/core

Conflicts:
	tools/perf/builtin-record.c

Merge reason: add the live tracing feature, resolve conflict.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 61 insertions, 7 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index ca2affc9233f..a1b99eeac3c0 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -42,6 +42,7 @@ static unsigned int		mmap_pages			=    128;
 static unsigned int		user_freq 			= UINT_MAX;
 static int			freq				=   1000;
 static int			output;
+static int			pipe_output			=      0;
 static const char		*output_name			= "perf.data";
 static int			group				=      0;
 static unsigned int		realtime_prio			=      0;
@@ -109,6 +110,11 @@ static void mmap_write_tail(struct mmap_data *md, unsigned long tail)
 	pc->data_tail = tail;
 }
 
+static void advance_output(size_t size)
+{
+	bytes_written += size;
+}
+
 static void write_output(void *buf, size_t size)
 {
 	while (size) {
@@ -435,10 +441,19 @@ static int process_buildids(void)
 
 static void atexit_header(void)
 {
-	session->header.data_size += bytes_written;
+	if (!pipe_output) {
+		session->header.data_size += bytes_written;
 
-	process_buildids();
-	perf_header__write(&session->header, output, true);
+		process_buildids();
+		perf_header__write(&session->header, output, true);
+	} else {
+		int err;
+
+		err = event__synthesize_build_ids(process_synthesized_event,
+						  session);
+		if (err < 0)
+			pr_err("Couldn't synthesize build ids.\n");
+	}
 }
 
 static int __cmd_record(int argc, const char **argv)
@@ -464,7 +479,9 @@ static int __cmd_record(int argc, const char **argv)
 		exit(-1);
 	}
 
-	if (!stat(output_name, &st) && st.st_size) {
+	if (!strcmp(output_name, "-"))
+		pipe_output = 1;
+	else if (!stat(output_name, &st) && st.st_size) {
 		if (write_mode == WRITE_FORCE) {
 			char oldname[PATH_MAX];
 			snprintf(oldname, sizeof(oldname), "%s.old",
@@ -482,7 +499,10 @@ static int __cmd_record(int argc, const char **argv)
 	else
 		flags |= O_TRUNC;
 
-	output = open(output_name, flags, S_IRUSR|S_IWUSR);
+	if (pipe_output)
+		output = STDOUT_FILENO;
+	else
+		output = open(output_name, flags, S_IRUSR | S_IWUSR);
 	if (output < 0) {
 		perror("failed to create output file");
 		exit(-1);
@@ -496,7 +516,7 @@ static int __cmd_record(int argc, const char **argv)
 	}
 
 	if (!file_new) {
-		err = perf_header__read(&session->header, output);
+		err = perf_header__read(session, output);
 		if (err < 0)
 			return err;
 	}
@@ -522,6 +542,8 @@ static int __cmd_record(int argc, const char **argv)
 		}
 
 		if (!child_pid) {
+			if (pipe_output)
+				dup2(2, 1);
 			close(child_ready_pipe[0]);
 			close(go_pipe[1]);
 			fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
@@ -573,7 +595,11 @@ static int __cmd_record(int argc, const char **argv)
 			open_counters(cpumap[i]);
 	}
 
-	if (file_new) {
+	if (pipe_output) {
+		err = perf_header__write_pipe(output);
+		if (err < 0)
+			return err;
+	} else if (file_new) {
 		err = perf_header__write(&session->header, output, false);
 		if (err < 0)
 			return err;
@@ -581,6 +607,34 @@ static int __cmd_record(int argc, const char **argv)
 
 	post_processing_offset = lseek(output, 0, SEEK_CUR);
 
+	if (pipe_output) {
+		err = event__synthesize_attrs(&session->header,
+					      process_synthesized_event,
+					      session);
+		if (err < 0) {
+			pr_err("Couldn't synthesize attrs.\n");
+			return err;
+		}
+
+		err = event__synthesize_event_types(process_synthesized_event,
+						    session);
+		if (err < 0) {
+			pr_err("Couldn't synthesize event_types.\n");
+			return err;
+		}
+
+		err = event__synthesize_tracing_data(output, attrs,
+						     nr_counters,
+						     process_synthesized_event,
+						     session);
+		if (err <= 0) {
+			pr_err("Couldn't record tracing data.\n");
+			return err;
+		}
+
+		advance_output(err);
+	}
+
 	err = event__synthesize_kernel_mmap(process_synthesized_event,
 					    session, "_text");
 	if (err < 0)