linux-kernel - [PATCH 13/16] perf kvm: debug for missing vmexit/vmentry event

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Date:	Sat, 25 May 2013 18:24:53 -0600
From:	David Ahern <dsahern@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	acme@...stprotocols.net, mingo@...nel.org, fweisbec@...il.com,
	peterz@...radead.org, jolsa@...hat.com, namhyung@...nel.org,
	xiaoguangrong@...ux.vnet.ibm.com, runzhen@...ux.vnet.ibm.com,
	David Ahern <dsahern@...il.com>
Subject: [PATCH 13/16] perf kvm: debug for missing vmexit/vmentry event

Expected to have missing events for each vcpu when perf is
started. After that should not have missing events.

Signed-off-by: David Ahern <dsahern@...il.com>
Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc: Runzhen Wang <runzhen@...ux.vnet.ibm.com>
---
 tools/perf/builtin-kvm.c |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index c2fede6..76cfe59 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -568,11 +568,22 @@ static bool handle_kvm_event(struct perf_kvm_stat *kvm,
 	    (kvm->trace_vcpu != vcpu_record->vcpu_id))
 		return true;
 
-	if (kvm->events_ops->is_begin_event(evsel, sample, &key))
+	if (kvm->events_ops->is_begin_event(evsel, sample, &key)) {
+		if (vcpu_record->start_time) {
+			pr_debug("consecutive begin events (%s) for pid %d, vcpu %d\n",
+				 evsel->name, sample->pid, vcpu_record->vcpu_id);
+		}
 		return handle_begin_event(kvm, vcpu_record, &key, sample->time);
+	}
+
 
-	if (kvm->events_ops->is_end_event(evsel, sample, &key))
+	if (kvm->events_ops->is_end_event(evsel, sample, &key)) {
+		if (vcpu_record->start_time == 0) {
+			pr_debug("consecutive end events (%s) for pid %d, vcpu %d\n",
+				 evsel->name, sample->pid, vcpu_record->vcpu_id);
+		}
 		return handle_end_event(kvm, vcpu_record, &key, sample);
+	}
 
 	return true;
 }
-- 
1.7.10.1

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