linux-kernel - [PATCH v2 11/15] perf ftrace: add support for trace option funcgraph-irqs

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Date:   Sat, 27 Jun 2020 21:36:50 +0800
From:   Changbin Du <changbin.du@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, Changbin Du <changbin.du@...il.com>
Subject: [PATCH v2 11/15] perf ftrace: add support for trace option funcgraph-irqs

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

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

---
v2: option name '--nofuncgraph-irqs' -> '--graph-noirqs'.
---
 tools/perf/Documentation/perf-ftrace.txt |  3 +++
 tools/perf/builtin-ftrace.c              | 20 ++++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/tools/perf/Documentation/perf-ftrace.txt b/tools/perf/Documentation/perf-ftrace.txt
index a3000436f80b..b616e05d5156 100644
--- a/tools/perf/Documentation/perf-ftrace.txt
+++ b/tools/perf/Documentation/perf-ftrace.txt
@@ -107,6 +107,9 @@ OPTIONS
 --graph-nosleep-time::
 	Measure on-CPU time only for function_graph tracer.
 
+--graph-noirqs::
+	Ignore functions that happen inside interrupt for function_graph tracer.
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-trace[1]
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index eba125a60820..876c8e800425 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -43,6 +43,7 @@ struct perf_ftrace {
 	bool			inherit;
 	bool			func_stack_trace;
 	bool			graph_nosleep_time;
+	bool			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)
@@ -393,6 +395,17 @@ 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;
@@ -477,6 +490,11 @@ 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 +676,8 @@ int cmd_ftrace(int argc, const char **argv)
 		    "trace children processes"),
 	OPT_BOOLEAN(0, "graph-nosleep-time", &ftrace.graph_nosleep_time,
 		    "measure on-CPU time only for function_graph tracer"),
+	OPT_BOOLEAN(0, "graph-noirqs", &ftrace.graph_noirqs,
+		    "ignore functions that happen inside interrupt for function_graph tracer"),
 	OPT_END()
 	};
 
-- 
2.25.1