linux-kernel - [RFC 03/13] perf kwork: Add softirq record support

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Date:   Mon, 13 Jun 2022 17:45:55 +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>,
        <linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>
CC:     <yangjihong1@...wei.com>
Subject: [RFC 03/13] perf kwork: Add softirq record support

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

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 0.736 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

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 0.165 MB perf_kwork.date ]

  # perf evlist -i perf_kwork.date
  irq:softirq_raise
  irq:softirq_entry
  irq:softirq_exit
  dummy:HG

Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
 tools/perf/builtin-kwork.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
index 822904b2597e..0da554e04f16 100644
--- a/tools/perf/builtin-kwork.c
+++ b/tools/perf/builtin-kwork.c
@@ -26,6 +26,7 @@
 
 enum kwork_class_type {
 	KWORK_CLASS_IRQ,
+	KWORK_CLASS_SOFTIRQ,
 	KWORK_CLASS_MAX,
 };
 
@@ -80,8 +81,21 @@ 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",
+	.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,
-- 
2.30.GIT