Check in gVisor.

PiperOrigin-RevId: 194583126
Change-Id: Ica1d8821a90f74e7e745962d71801c598c652463

1 files changed, 44 insertions, 0 deletions

diff --git a/pkg/sentry/usage/cpu.go b/pkg/sentry/usage/cpu.go
new file mode 100644
index 000000000..1c2cc90e1
--- /dev/null
+++ b/pkg/sentry/usage/cpu.go
@@ -0,0 +1,44 @@
+// Copyright 2018 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package usage
+
+import (
+	"time"
+)
+
+// CPUStats contains the subset of struct rusage fields that relate to CPU
+// scheduling.
+type CPUStats struct {
+	// UserTime is the amount of time spent executing application code.
+	UserTime time.Duration
+
+	// SysTime is the amount of time spent executing sentry code.
+	SysTime time.Duration
+
+	// VoluntarySwitches is the number of times control has been voluntarily
+	// ceded due to blocking, etc.
+	VoluntarySwitches uint64
+
+	// InvoluntarySwitches (struct rusage::ru_nivcsw) is unsupported, since
+	// "preemptive" scheduling is managed by the Go runtime, which doesn't
+	// provide this information.
+}
+
+// Accumulate adds s2 to s.
+func (s *CPUStats) Accumulate(s2 CPUStats) {
+	s.UserTime += s2.UserTime
+	s.SysTime += s2.SysTime
+	s.VoluntarySwitches += s2.VoluntarySwitches
+}