linux-kernel - [RFC v3 03/17] perf kwork: Add softirq kwork record support

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Date:   Sat, 9 Jul 2022 09:50:19 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <pc@...ibm.com>,
        <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
CC:     <yangjihong1@...wei.com>
Subject: [RFC v3 03/17] perf kwork: Add softirq kwork record support

Record softirq events irq:softirq_raise, irq:softirq_entry &
irq:softirq_exit.

Test cases:
Record all events:

  # perf kwork record -o perf_kwork.date -- sleep 1
  [ perf record: Woken up 0 times to write data ]
  [ perf record: Captured and wrote 0.897 MB perf_kwork.date ]
  #
  # perf evlist -i perf_kwork.date
  irq:irq_handler_entry
  irq:irq_handler_exit
  irq:softirq_raise
  irq:softirq_entry
  irq:softirq_exit
  dummy:HG
  # Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events

Record softirq events:

  # perf kwork -k softirq record -o perf_kwork.date -- sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.141 MB perf_kwork.date ]
  #
  # perf evlist -i perf_kwork.date
  irq:softirq_raise
  irq:softirq_entry
  irq:softirq_exit
  dummy:HG
  # Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events

Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
 tools/perf/Documentation/perf-kwork.txt |  2 +-
 tools/perf/builtin-kwork.c              | 16 +++++++++++++++-
 tools/perf/util/kwork.h                 |  1 +
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-kwork.txt b/tools/perf/Documentation/perf-kwork.txt
index 57bd5fa7d5c9..abfdeca2ad39 100644
--- a/tools/perf/Documentation/perf-kwork.txt
+++ b/tools/perf/Documentation/perf-kwork.txt
@@ -32,7 +32,7 @@ OPTIONS
 
 -k::
 --kwork::
-	List of kwork to profile (irq, etc)
+	List of kwork to profile (irq, softirq, etc)
 
 -v::
 --verbose::
diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
index a26b7fde1e38..2c492c8fd019 100644
--- a/tools/perf/builtin-kwork.c
+++ b/tools/perf/builtin-kwork.c
@@ -37,8 +37,22 @@ static struct kwork_class kwork_irq = {
 	.tp_handlers    = irq_tp_handlers,
 };
 
+const struct evsel_str_handler softirq_tp_handlers[] = {
+	{ "irq:softirq_raise", NULL, },
+	{ "irq:softirq_entry", NULL, },
+	{ "irq:softirq_exit",  NULL, },
+};
+
+static struct kwork_class kwork_softirq = {
+	.name           = "softirq",
+	.type           = KWORK_CLASS_SOFTIRQ,
+	.nr_tracepoints = 3,
+	.tp_handlers    = softirq_tp_handlers,
+};
+
 static struct kwork_class *kwork_class_supported_list[KWORK_CLASS_MAX] = {
 	[KWORK_CLASS_IRQ]       = &kwork_irq,
+	[KWORK_CLASS_SOFTIRQ]   = &kwork_softirq,
 };
 
 static void setup_event_list(struct perf_kwork *kwork,
@@ -145,7 +159,7 @@ int cmd_kwork(int argc, const char **argv)
 	OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
 		    "dump raw trace in ASCII"),
 	OPT_STRING('k', "kwork", &kwork.event_list_str, "kwork",
-		   "list of kwork to profile (irq, etc)"),
+		   "list of kwork to profile (irq, softirq, etc)"),
 	OPT_BOOLEAN('f', "force", &kwork.force, "don't complain, do it"),
 	OPT_END()
 	};
diff --git a/tools/perf/util/kwork.h b/tools/perf/util/kwork.h
index f1d89cb058fc..669a81626cb4 100644
--- a/tools/perf/util/kwork.h
+++ b/tools/perf/util/kwork.h
@@ -14,6 +14,7 @@
 
 enum kwork_class_type {
 	KWORK_CLASS_IRQ,
+	KWORK_CLASS_SOFTIRQ,
 	KWORK_CLASS_MAX,
 };
 
-- 
2.30.GIT