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// Copyright 2018 The gVisor Authors.
//
// 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.
//
// +stateify savable
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
}
// DifferenceSince computes s - earlierSample.
//
// Precondition: s >= earlierSample.
func (s *CPUStats) DifferenceSince(earlierSample CPUStats) CPUStats {
return CPUStats{
UserTime: s.UserTime - earlierSample.UserTime,
SysTime: s.SysTime - earlierSample.SysTime,
VoluntarySwitches: s.VoluntarySwitches - earlierSample.VoluntarySwitches,
}
}
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