[PATCH 08/19] perf ftrace: add option -l/--long-info to show more info

[Changbin Du]

Sometimes we want ftrace display more and longer information about trace.

$ sudo perf ftrace -G -l
 6800.190937 |   4)   <...>-7683   |   2.072 us    |  mutex_unlock();
 6800.190941 |   4)   <...>-7683   |   2.171 us    |  __fsnotify_parent();
 6800.190943 |   4)   <...>-7683   |   1.497 us    |  fsnotify();
 6800.190944 |   4)   <...>-7683   |   0.775 us    |  __sb_end_write();
 6800.190945 |   4)   <...>-7683   |   0.854 us    |  fpregs_assert_state_consistent();
 6800.190947 |   4)   <...>-7683   |               |  do_syscall_64() {
 6800.190948 |   4)   <...>-7683   |               |    __x64_sys_close() {
 6800.190948 |   4)   <...>-7683   |               |      __close_fd() {
 6800.190948 |   4)   <...>-7683   |   0.322 us    |        _raw_spin_lock();
 6800.190949 |   4)   <...>-7683   |               |        filp_close() {
 6800.190949 |   4)   <...>-7683   |   0.320 us    |          dnotify_flush();
 6800.190950 |   4)   <...>-7683   |   0.325 us    |          locks_remove_posix();

Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx>
---
 tools/perf/builtin-ftrace.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index b16600a16efa..f11f2d3431b0 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -42,6 +42,7 @@ struct perf_ftrace {
 	bool			func_stack_trace;
 	bool			nosleep_time;
 	bool			nofuncgraph_irqs;
+	bool			long_info;
 };
 
 struct filter_entry {
@@ -190,6 +191,9 @@ static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
 	write_tracing_option_file("func_stack_trace", "0");
 	write_tracing_option_file("sleep-time", "1");
 	write_tracing_option_file("funcgraph-irqs", "1");
+	write_tracing_option_file("funcgraph-proc", "0");
+	write_tracing_option_file("funcgraph-abstime", "0");
+	write_tracing_option_file("irq-info", "0");
 }
 
 static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
@@ -371,6 +375,23 @@ static int set_tracing_funcgraph_irqs(struct perf_ftrace *ftrace)
 	return 0;
 }
 
+static int set_tracing_long_info(struct perf_ftrace *ftrace)
+{
+	if (!ftrace->long_info)
+		return 0;
+
+	if (write_tracing_option_file("funcgraph-proc", "1") < 0)
+		return -1;
+
+	if (write_tracing_option_file("funcgraph-abstime", "1") < 0)
+		return -1;
+
+	if (write_tracing_option_file("irq-info", "1") < 0)
+		return -1;
+
+	return 0;
+}
+
 static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 {
 	char *trace_file;
@@ -449,6 +470,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 		goto out_reset;
 	}
 
+	if (set_tracing_long_info(ftrace) < 0) {
+		pr_err("failed to set tracing option funcgraph-proc/funcgraph-abstime/irq-info\n");
+		goto out_reset;
+	}
+
 	if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
 		pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
 		goto out_reset;
@@ -588,6 +614,8 @@ int cmd_ftrace(int argc, const char **argv)
 		    "Measure on-CPU time only (function_graph only)"),
 	OPT_BOOLEAN(0, "nofuncgraph-irqs", &ftrace.nofuncgraph_irqs,
 		    "Ignore functions that happen inside interrupt (function_graph only)"),
+	OPT_BOOLEAN('l', "long-info", &ftrace.long_info,
+		    "Show process names, PIDs, timestamps, irq-info if available"),
 	OPT_END()
 	};
 
-- 
2.25.1