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Subject[PATCH v4 12/17] perf ftrace: add support for tracing option 'irq-info'
Date
This adds support to display irq context info for function tracer. To do
this, just specify a '--func-opts irq-info' option.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
---
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 2e16e1e588d9..e6e9564d6c2e 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -81,6 +81,7 @@ OPTIONS
--func-opts::
List of options allowed to set:
call-graph - Display kernel stack trace for function tracer.
+ irq-info - Display irq context info for function tracer.

-G::
--graph-funcs=::
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 179c5da678e3..a5906258c413 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -42,6 +42,7 @@ struct perf_ftrace {
unsigned long percpu_buffer_size;
bool inherit;
int func_stack_trace;
+ int func_irq_info;
int graph_nosleep_time;
int graph_noirqs;
};
@@ -204,6 +205,7 @@ 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("irq-info", "0");
}

static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
@@ -291,6 +293,17 @@ static int set_tracing_func_stack_trace(struct perf_ftrace *ftrace)
return 0;
}

+static int set_tracing_func_irqinfo(struct perf_ftrace *ftrace)
+{
+ if (!ftrace->func_irq_info)
+ return 0;
+
+ if (write_tracing_option_file("irq-info", "1") < 0)
+ return -1;
+
+ return 0;
+}
+
static int reset_tracing_cpu(void)
{
struct perf_cpu_map *cpumap = perf_cpu_map__new(NULL);
@@ -466,6 +479,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
goto out_reset;
}

+ if (set_tracing_func_irqinfo(ftrace) < 0) {
+ pr_err("failed to set tracing option irq-info\n");
+ goto out_reset;
+ }
+
if (set_tracing_filters(ftrace) < 0) {
pr_err("failed to set tracing filters\n");
goto out_reset;
@@ -656,6 +674,7 @@ static int parse_func_tracer_opts(const struct option *opt,
struct perf_ftrace *ftrace = (struct perf_ftrace *) opt->value;
struct sublevel_option func_tracer_opts[] = {
{ .name = "call-graph", .value_ptr = &ftrace->func_stack_trace },
+ { .name = "irq-info", .value_ptr = &ftrace->func_irq_info },
{ .name = NULL, }
};

@@ -723,7 +742,7 @@ int cmd_ftrace(int argc, const char **argv)
OPT_CALLBACK('N', "notrace-funcs", &ftrace.notrace, "func",
"do not trace given functions", parse_filter_func),
OPT_CALLBACK(0, "func-opts", &ftrace, "options",
- "function tracer options, available options: call-graph",
+ "function tracer options, available options: call-graph,irq-info",
parse_func_tracer_opts),
OPT_CALLBACK('G', "graph-funcs", &ftrace.graph_funcs, "func",
"trace given functions using function_graph tracer",
--
2.25.1
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