[PATCH v5 11/17] perf ftrace: add support for trace option funcgraph-irqs

[Changbin Du]

This adds an option '--graph-opts noirqs' to filter out functions executed
in irq context.

Signed-off-by: Changbin Du <changbin...@gmail.com>

---
v2: option name '--nofuncgraph-irqs' -> '--graph-noirqs'.
---
 tools/perf/Documentation/perf-ftrace.txt |  1 +
 tools/perf/builtin-ftrace.c              | 21 ++++++++++++++++++++-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-ftrace.txt 
b/tools/perf/Documentation/perf-ftrace.txt
index 760c2b78c305..2e16e1e588d9 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -105,6 +105,7 @@ OPTIONS
 --graph-opts::
        List of options allowed to set:
          nosleep-time - Measure on-CPU time only for function_graph tracer.
+         noirqs       - Ignore functions that happen inside interrupt.
 
 SEE ALSO
 --------
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index b4eda459ba78..179c5da678e3 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -43,6 +43,7 @@ struct perf_ftrace {
        bool                    inherit;
        int                     func_stack_trace;
        int                     graph_nosleep_time;
+       int                     graph_noirqs;
 };
 
 struct filter_entry {
@@ -202,6 +203,7 @@ static void reset_tracing_options(struct perf_ftrace 
*ftrace __maybe_unused)
        write_tracing_option_file("function-fork", "0");
        write_tracing_option_file("func_stack_trace", "0");
        write_tracing_option_file("sleep-time", "1");
+       write_tracing_option_file("funcgraph-irqs", "1");
 }
 
 static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
@@ -394,6 +396,17 @@ static int set_tracing_sleep_time(struct perf_ftrace 
*ftrace)
        return 0;
 }
 
+static int set_tracing_funcgraph_irqs(struct perf_ftrace *ftrace)
+{
+       if (!ftrace->graph_noirqs)
+               return 0;
+
+       if (write_tracing_option_file("funcgraph-irqs", "0") < 0)
+               return -1;
+
+       return 0;
+}
+
 static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char 
**argv)
 {
        char *trace_file;
@@ -478,6 +491,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int 
argc, const char **argv)
                goto out_reset;
        }
 
+       if (set_tracing_funcgraph_irqs(ftrace) < 0) {
+               pr_err("failed to set tracing option funcgraph-irqs\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;
@@ -658,6 +676,7 @@ static int parse_graph_tracer_opts(const struct option *opt,
        struct perf_ftrace *ftrace = (struct perf_ftrace *) opt->value;
        struct sublevel_option graph_tracer_opts[] = {
                { .name = "nosleep-time",       .value_ptr = 
&ftrace->graph_nosleep_time },
+               { .name = "noirqs",             .value_ptr = 
&ftrace->graph_noirqs },
                { .name = NULL, }
        };
 
@@ -714,7 +733,7 @@ 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",
+                    "graph tracer options, available options: 
nosleep-time,noirqs",
                     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