perf kwork: New tool to trace time properties of kernel work (such as softirq, and workqueue)

The 'perf kwork' tool is used to trace time properties of kernel work
(such as irq, softirq, and workqueue), including runtime, latency, and
timehist, using the infrastructure in the perf tools to allow tracing
extra targets.

This is the first commit to reuse the 'perf record' framework code to
implement a simple record function, kwork is not supported currently.

Test cases:

  # perf

   usage: perf [--version] [--help] [OPTIONS] COMMAND [ARGS]

   The most commonly used perf commands are:
  <SNIP>
     iostat          Show I/O performance metrics
     kallsyms        Searches running kernel for symbols
     kmem            Tool to trace/measure kernel memory properties
     kvm             Tool to trace/measure kvm guest os
     kwork           Tool to trace/measure kernel work properties (latencies)
     list            List all symbolic event types
     lock            Analyze lock events
     mem             Profile memory accesses
     record          Run a command and record its profile into perf.data
  <SNIP>
   See 'perf help COMMAND' for more information on a specific command.

  # perf kwork

   Usage: perf kwork [<options>] {record}

      -D, --dump-raw-trace  dump raw trace in ASCII
      -f, --force           don't complain, do it
      -k, --kwork <kwork>   list of kwork to profile
      -v, --verbose         be more verbose (show symbol address, etc)

  # perf kwork record -- sleep 1
  [ perf record: Woken up 0 times to write data ]
  [ perf record: Captured and wrote 1.787 MB perf.data ]

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/20220709015033.38326-2-yangjihong1@huawei.com
[ Add {} for multiline if blocks ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/tools/perf/util/kwork.h b/tools/perf/util/kwork.h
new file mode 100644
index 000000000000..6950636aab2a
--- /dev/null
+++ b/tools/perf/util/kwork.h
@@ -0,0 +1,41 @@
+#ifndef PERF_UTIL_KWORK_H
+#define PERF_UTIL_KWORK_H
+
+#include "perf.h"
+
+#include "util/tool.h"
+#include "util/event.h"
+#include "util/evlist.h"
+#include "util/session.h"
+#include "util/time-utils.h"
+
+#include <linux/list.h>
+#include <linux/bitmap.h>
+
+enum kwork_class_type {
+	KWORK_CLASS_MAX,
+};
+
+struct kwork_class {
+	struct list_head list;
+	const char *name;
+	enum kwork_class_type type;
+
+	unsigned int nr_tracepoints;
+	const struct evsel_str_handler *tp_handlers;
+};
+
+struct perf_kwork {
+	/*
+	 * metadata
+	 */
+	struct list_head class_list;
+
+	/*
+	 * options for command
+	 */
+	bool force;
+	const char *event_list_str;
+};
+
+#endif  /* PERF_UTIL_KWORK_H */