[PATCH RFC 06/10] perf,tools: New RECORD type PERF_RECORD_STAT_READ

[kan . liang]

From: Kan Liang <kan.liang@xxxxxxxxx>

Introduce a new user RECORD type PERF_RECORD_STAT_READ to store the
stat event read result.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx>
---
 tools/perf/util/event.c   |  1 +
 tools/perf/util/event.h   | 10 ++++++++++
 tools/perf/util/session.c | 15 +++++++++++++++
 tools/perf/util/tool.h    |  1 +
 4 files changed, 27 insertions(+)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 7ff6127..601f4be 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -37,6 +37,7 @@ static const char *perf_event__names[] = {
 	[PERF_RECORD_AUXTRACE_INFO]		= "AUXTRACE_INFO",
 	[PERF_RECORD_AUXTRACE]			= "AUXTRACE",
 	[PERF_RECORD_AUXTRACE_ERROR]		= "AUXTRACE_ERROR",
+	[PERF_RECORD_STAT_READ]			= "STAT_READ",
 };
 
 const char *perf_event__name(unsigned int id)
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index f729df5..f6932cf 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -226,6 +226,7 @@ enum perf_user_event_type { /* above any possible kernel type */
 	PERF_RECORD_AUXTRACE_INFO		= 70,
 	PERF_RECORD_AUXTRACE			= 71,
 	PERF_RECORD_AUXTRACE_ERROR		= 72,
+	PERF_RECORD_STAT_READ			= 73,
 	PERF_RECORD_HEADER_MAX
 };
 
@@ -355,6 +356,14 @@ struct context_switch_event {
 	u32 next_prev_tid;
 };
 
+struct stat_read_event {
+	struct perf_event_header header;
+	u64	value;		/* counter value delta */
+	u32	cpu;
+	u32	pos_id;		/* event position in evlist */
+	u64	time;		/* time stamp */
+};
+
 union perf_event {
 	struct perf_event_header	header;
 	struct mmap_event		mmap;
@@ -377,6 +386,7 @@ union perf_event {
 	struct aux_event		aux;
 	struct itrace_start_event	itrace_start;
 	struct context_switch_event	context_switch;
+	struct stat_read_event		stat_read;
 };
 
 void perf_event__print_totals(void);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 18722e7..1547970 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -337,6 +337,8 @@ void perf_tool__fill_defaults(struct perf_tool *tool)
 		tool->context_switch = perf_event__process_switch;
 	if (tool->read == NULL)
 		tool->read = process_event_sample_stub;
+	if (tool->stat_read == NULL)
+		tool->stat_read = process_build_id_stub;
 	if (tool->throttle == NULL)
 		tool->throttle = process_event_stub;
 	if (tool->unthrottle == NULL)
@@ -440,6 +442,16 @@ static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
 		swap_sample_id_all(event, &event->fork + 1);
 }
 
+static void perf_event__stat_read_swap(union perf_event *event,
+				       bool sample_id_all __maybe_unused)
+{
+
+	event->stat_read.value = bswap_64(event->stat_read.value);
+	event->stat_read.cpu = bswap_32(event->stat_read.cpu);
+	event->stat_read.pos_id = bswap_32(event->stat_read.pos_id);
+	event->stat_read.time = bswap_64(event->stat_read.time);
+}
+
 static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
 {
 	event->read.pid		 = bswap_32(event->read.pid);
@@ -642,6 +654,7 @@ static perf_event__swap_op perf_event__swap_ops[] = {
 	[PERF_RECORD_EXIT]		  = perf_event__task_swap,
 	[PERF_RECORD_LOST]		  = perf_event__all64_swap,
 	[PERF_RECORD_READ]		  = perf_event__read_swap,
+	[PERF_RECORD_STAT_READ]		  = perf_event__stat_read_swap,
 	[PERF_RECORD_THROTTLE]		  = perf_event__throttle_swap,
 	[PERF_RECORD_UNTHROTTLE]	  = perf_event__throttle_swap,
 	[PERF_RECORD_SAMPLE]		  = perf_event__all64_swap,
@@ -1191,6 +1204,8 @@ static s64 perf_session__process_user_event(struct perf_session *session,
 	case PERF_RECORD_AUXTRACE_ERROR:
 		perf_session__auxtrace_error_inc(session, event);
 		return tool->auxtrace_error(tool, event, session);
+	case PERF_RECORD_STAT_READ:
+		return tool->stat_read(tool, event, session);
 	default:
 		return -EINVAL;
 	}
diff --git a/tools/perf/util/tool.h b/tools/perf/util/tool.h
index cab8cc2..3a002a2 100644
--- a/tools/perf/util/tool.h
+++ b/tools/perf/util/tool.h
@@ -57,6 +57,7 @@ struct perf_tool {
 			auxtrace_info,
 			auxtrace_error;
 	event_op3	auxtrace;
+	event_op2	stat_read;
 	bool		ordered_events;
 	bool		ordering_requires_timestamps;
 };
-- 
1.8.3.1

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