[PATCH v8 12/18] perf ftrace: add option 'verbose' to show more info for graph tracer

[Changbin Du]

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

$ sudo perf ftrace -G '*'
 2)   0.979 us    |  mutex_unlock();
 2)   1.540 us    |  __fsnotify_parent();
 2)   0.433 us    |  fsnotify();

$ sudo perf ftrace -G '*' --graph-opts verbose
14160.770883 |   0)  <...>-47814   |  .... |   1.289 us    |  mutex_unlock();
14160.770886 |   0)  <...>-47814   |  .... |   1.624 us    |  
__fsnotify_parent();
14160.770887 |   0)  <...>-47814   |  .... |   0.636 us    |  fsnotify();
14160.770888 |   0)  <...>-47814   |  .... |   0.328 us    |  __sb_end_write();
14160.770888 |   0)  <...>-47814   |  d... |   0.430 us    |  
fpregs_assert_state_consistent();
14160.770889 |   0)  <...>-47814   |  d... |               |  do_syscall_64() {
14160.770889 |   0)  <...>-47814   |  .... |               |    
__x64_sys_close() {

Signed-off-by: Changbin Du <changbin...@gmail.com>
---
 tools/perf/Documentation/perf-ftrace.txt |  1 +
 tools/perf/builtin-ftrace.c              | 29 +++++++++++++++++++++++-
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-ftrace.txt 
b/tools/perf/Documentation/perf-ftrace.txt
index 37ea3ea97922..a2056aaf2ece 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -106,6 +106,7 @@ OPTIONS
        List of options allowed to set:
          nosleep-time - Measure on-CPU time only for function_graph tracer.
          noirqs       - Ignore functions that happen inside interrupt.
+         verbose      - Show process names, PIDs, timestamps, etc.
 
 SEE ALSO
 --------
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index d1241febe143..8ee5287bd84a 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -47,6 +47,7 @@ struct perf_ftrace {
        int                     func_irq_info;
        int                     graph_nosleep_time;
        int                     graph_noirqs;
+       int                     graph_verbose;
 };
 
 struct filter_entry {
@@ -210,6 +211,9 @@ 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("latency-format", "0");
        write_tracing_option_file("irq-info", "0");
 }
 
@@ -425,6 +429,23 @@ static int set_tracing_funcgraph_irqs(struct perf_ftrace 
*ftrace)
        return 0;
 }
 
+static int set_tracing_funcgraph_verbose(struct perf_ftrace *ftrace)
+{
+       if (!ftrace->graph_verbose)
+               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("latency-format", "1") < 0)
+               return -1;
+
+       return 0;
+}
+
 static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char 
**argv)
 {
        char *trace_file;
@@ -519,6 +540,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int 
argc, const char **argv)
                goto out_reset;
        }
 
+       if (set_tracing_funcgraph_verbose(ftrace) < 0) {
+               pr_err("failed to set tracing option 
funcgraph-proc/funcgraph-abstime\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;
@@ -700,6 +726,7 @@ static int parse_graph_tracer_opts(const struct option *opt,
        struct sublevel_option graph_tracer_opts[] = {
                { .name = "nosleep-time",       .value_ptr = 
&ftrace->graph_nosleep_time },
                { .name = "noirqs",             .value_ptr = 
&ftrace->graph_noirqs },
+               { .name = "verbose",            .value_ptr = 
&ftrace->graph_verbose },
                { .name = NULL, }
        };
 
@@ -771,7 +798,7 @@ int cmd_ftrace(int argc, const char **argv)
        OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth,
                    "Max depth for function graph tracer"),
        OPT_CALLBACK(0, "graph-opts", &ftrace, "options",
-                    "graph tracer options, available options: 
nosleep-time,noirqs",
+                    "graph tracer options, available options: 
nosleep-time,noirqs,verbose",
                     parse_graph_tracer_opts),
        OPT_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size",
                     "size of per cpu buffer", parse_buffer_size),
-- 
2.25.1