Commit e6439321 authored Jul 09, 2022 by Yang Jihong Committed by Arnaldo Carvalho de Melo Jul 26, 2022

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

Committer testing:

  # perf kwork record sleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 3.078 MB perf.data (17433 samples) ]
  # perf evlist -v
  irq:irq_handler_entry: type: 2, size: 128, config: 0x97, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, sample_id_all: 1, exclude_guest: 1
  irq:irq_handler_exit: type: 2, size: 128, config: 0x96, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, sample_id_all: 1, exclude_guest: 1
  irq:softirq_raise: type: 2, size: 128, config: 0x93, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, sample_id_all: 1, exclude_guest: 1
  irq:softirq_entry: type: 2, size: 128, config: 0x95, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, sample_id_all: 1, exclude_guest: 1
  irq:softirq_exit: type: 2, size: 128, config: 0x94, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, sample_id_all: 1, exclude_guest: 1
  dummy:HG: type: 1, size: 128, config: 0x9, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU|RAW|IDENTIFIER, read_format: ID, inherit: 1, mmap: 1, comm: 1, task: 1, sample_id_all: 1, mmap2: 1, comm_exec: 1, ksymbol: 1, bpf_event: 1
  # Tip: use 'perf evlist --trace-fields' to show fields for tracepoint events
  # perf script | head
      migration/12    73 [012] 25884.940992:     irq:softirq_raise: vec=9 [action=RCU]
      migration/12    73 [012] 25884.940994:     irq:softirq_entry: vec=9 [action=RCU]
      migration/12    73 [012] 25884.940995:      irq:softirq_exit: vec=9 [action=RCU]
           swapper     0 [004] 25884.940995:     irq:softirq_raise: vec=9 [action=RCU]
           swapper     0 [004] 25884.940998:     irq:softirq_entry: vec=9 [action=RCU]
           swapper     0 [004] 25884.940999:      irq:softirq_exit: vec=9 [action=RCU]
               cc1 71212 [021] 25884.941990:     irq:softirq_raise: vec=9 [action=RCU]
           swapper     0 [004] 25884.941991:     irq:softirq_raise: vec=9 [action=RCU]
               cc1 71212 [021] 25884.941992:     irq:softirq_raise: vec=7 [action=SCHED]
         perf-exec 71208 [013] 25884.941992:     irq:softirq_raise: vec=9 [action=RCU]
  #

Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Clarke <pc@us.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220709015033.38326-4-yangjihong1@huawei.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 4f8ae962

tools/perf/Documentation/perf-kwork.txt

+1 −1

Original line number	Diff line number	Diff line
		@@ -32,7 +32,7 @@ OPTIONS

		-k::
		--kwork::
		List of kwork to profile (irq, etc)
		List of kwork to profile (irq, softirq, etc)

		-v::
		--verbose::

tools/perf/builtin-kwork.c

+15 −1

Original line number	Diff line number	Diff line
		@@ -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,
		@@ -146,7 +160,7 @@ 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()
		};

tools/perf/util/kwork.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -14,6 +14,7 @@

		enum kwork_class_type {
		KWORK_CLASS_IRQ,
		KWORK_CLASS_SOFTIRQ,
		KWORK_CLASS_MAX,
		};