perf kwork: Implement perf kwork latency

Implements framework of perf kwork latency, which is used to report time
properties such as delay time and frequency.

Test cases:

  # perf kwork lat -h

   Usage: perf kwork latency [<options>]

      -C, --cpu <cpu>       list of cpus to profile
      -i, --input <file>    input file name
      -n, --name <name>     event name to profile
      -s, --sort <key[,key2...]>
                            sort by key(s): avg, max, count
          --time <str>      Time span for analysis (start,stop)

  # perf kwork lat -C 199
  Requested CPU 199 too large. Consider raising MAX_NR_CPUS
  Invalid cpu bitmap

  # perf kwork lat -i perf_no_exist.data
  failed to open perf_no_exist.data: No such file or directory

  # perf kwork lat -s avg1
    Error: Unknown --sort key: `avg1'

   Usage: perf kwork latency [<options>]

      -C, --cpu <cpu>       list of cpus to profile
      -i, --input <file>    input file name
      -n, --name <name>     event name to profile
      -s, --sort <key[,key2...]>
                            sort by key(s): avg, max, count
          --time <str>      Time span for analysis (start,stop)

  # perf kwork lat --time FFFF,
  Invalid time span

  # perf kwork lat

    Kwork Name                     | Cpu  | Avg delay     | Count    | Max delay     | Max delay start     | Max delay end       |
   --------------------------------------------------------------------------------------------------------------------------------
   --------------------------------------------------------------------------------------------------------------------------------
    INFO: 36.570% skipped events (31537 including 0 raise, 31537 entry, 0 exit)

Since there are no latency-enabled events, the output is empty.

Signed-off-by: Yang Jihong <yangjihong1@huawei.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/20220709015033.38326-11-yangjihong1@huawei.com
[ Add {} for multiline if blocks ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/tools/perf/util/kwork.h b/tools/perf/util/kwork.h
index 0a86bf47c74d..e540373ab14e 100644
--- a/tools/perf/util/kwork.h
+++ b/tools/perf/util/kwork.h
@@ -21,9 +21,11 @@ enum kwork_class_type {
 
 enum kwork_report_type {
 	KWORK_REPORT_RUNTIME,
+	KWORK_REPORT_LATENCY,
 };
 
 enum kwork_trace_type {
+	KWORK_TRACE_RAISE,
 	KWORK_TRACE_ENTRY,
 	KWORK_TRACE_EXIT,
 	KWORK_TRACE_MAX,
@@ -116,6 +118,14 @@ struct kwork_work {
 	u64 max_runtime_start;
 	u64 max_runtime_end;
 	u64 total_runtime;
+
+	/*
+	 * latency report
+	 */
+	u64 max_latency;
+	u64 max_latency_start;
+	u64 max_latency_end;
+	u64 total_latency;
 };
 
 struct kwork_class {
@@ -143,6 +153,10 @@ struct kwork_class {
 
 struct perf_kwork;
 struct trace_kwork_handler {
+	int (*raise_event)(struct perf_kwork *kwork,
+			   struct kwork_class *class, struct evsel *evsel,
+			   struct perf_sample *sample, struct machine *machine);
+
 	int (*entry_event)(struct perf_kwork *kwork,
 			   struct kwork_class *class, struct evsel *evsel,
 			   struct perf_sample *sample, struct machine *machine);