tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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>

authored by

Yang Jihong and committed by
Arnaldo Carvalho de Melo e6439321 4f8ae962

+17 -2
+1 -1
tools/perf/Documentation/perf-kwork.txt
··· 32 32 33 33 -k:: 34 34 --kwork:: 35 - List of kwork to profile (irq, etc) 35 + List of kwork to profile (irq, softirq, etc) 36 36 37 37 -v:: 38 38 --verbose::
+15 -1
tools/perf/builtin-kwork.c
··· 37 37 .tp_handlers = irq_tp_handlers, 38 38 }; 39 39 40 + const struct evsel_str_handler softirq_tp_handlers[] = { 41 + { "irq:softirq_raise", NULL, }, 42 + { "irq:softirq_entry", NULL, }, 43 + { "irq:softirq_exit", NULL, }, 44 + }; 45 + 46 + static struct kwork_class kwork_softirq = { 47 + .name = "softirq", 48 + .type = KWORK_CLASS_SOFTIRQ, 49 + .nr_tracepoints = 3, 50 + .tp_handlers = softirq_tp_handlers, 51 + }; 52 + 40 53 static struct kwork_class *kwork_class_supported_list[KWORK_CLASS_MAX] = { 41 54 [KWORK_CLASS_IRQ] = &kwork_irq, 55 + [KWORK_CLASS_SOFTIRQ] = &kwork_softirq, 42 56 }; 43 57 44 58 static void setup_event_list(struct perf_kwork *kwork, ··· 160 146 OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace, 161 147 "dump raw trace in ASCII"), 162 148 OPT_STRING('k', "kwork", &kwork.event_list_str, "kwork", 163 - "list of kwork to profile (irq, etc)"), 149 + "list of kwork to profile (irq, softirq, etc)"), 164 150 OPT_BOOLEAN('f', "force", &kwork.force, "don't complain, do it"), 165 151 OPT_END() 166 152 };
+1
tools/perf/util/kwork.h
··· 14 14 15 15 enum kwork_class_type { 16 16 KWORK_CLASS_IRQ, 17 + KWORK_CLASS_SOFTIRQ, 17 18 KWORK_CLASS_MAX, 18 19 }; 19 20