[PATCH 12/13] perf kvm: option to print events that exceed a threshold

[David Ahern <dsahern@gmail.com>]

This is useful to spot high latency blips.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
---
 tools/perf/builtin-kvm.c |   24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 905aa75..d4e9124 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -106,6 +106,7 @@ struct perf_kvm_stat {
 	u64 total_time;
 	u64 total_count;
 	u64 lost_events;
+	u64 threshold;
 
 	struct rb_root result;
 
@@ -470,7 +471,7 @@ static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
 static bool handle_end_event(struct perf_kvm_stat *kvm,
 			     struct vcpu_event_record *vcpu_record,
 			     struct event_key *key,
-			     u64 timestamp)
+			     struct perf_sample *sample)
 {
 	struct kvm_event *event;
 	u64 time_begin, time_diff;
@@ -507,12 +508,24 @@ static bool handle_end_event(struct perf_kvm_stat *kvm,
 	vcpu_record->start_time = 0;
 
 	/* seems to happen once in a while during live mode */
-	if (timestamp < time_begin) {
+	if (sample->time < time_begin) {
 		pr_debug("End time before begin time; skipping event.\n");
 		return true;
 	}
 
-	time_diff = timestamp - time_begin;
+	time_diff = sample->time - time_begin;
+
+	if (kvm->threshold && time_diff > kvm->threshold) {
+		char decode[32];
+
+		kvm->events_ops->decode_key(kvm, &event->key, decode);
+		if (strcmp(decode, "HLT")) {
+			pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
+				 sample->time, sample->pid, vcpu_record->vcpu_id,
+				 decode, time_diff/1000);
+		}
+	}
+
 	return update_kvm_event(event, vcpu, time_diff);
 }
 
@@ -559,7 +572,7 @@ static bool handle_kvm_event(struct perf_kvm_stat *kvm,
 		return handle_begin_event(kvm, vcpu_record, &key, sample->time);
 
 	if (kvm->events_ops->is_end_event(evsel, sample, &key))
-		return handle_end_event(kvm, vcpu_record, &key, sample->time);
+		return handle_end_event(kvm, vcpu_record, &key, sample);
 
 	return true;
 }
@@ -1339,6 +1352,8 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
 		OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
 			"key for sorting: sample(sort by samples number)"
 			" time (sort by avg time)"),
+		OPT_U64('T', "threshold", &kvm->threshold,
+		    "show events that take longer than threshold usecs"),
 		OPT_END()
 	};
 	const char * const live_usage[] = {
@@ -1369,6 +1384,7 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
 
 	use_browser = 0;
 	setup_browser(false);
+	kvm->threshold *= 1000;   /* convert usec to nsec */
 
 	if (argc) {
 		argc = parse_options(argc, argv, live_options,
-- 
1.7.10.1