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cpustat.go
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cpustat.go
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// Copyright 2017 Xiaomi, 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 funcs
import (
"github.com/open-falcon/falcon-plus/common/model"
"github.com/toolkits/nux"
"sync"
)
const (
historyCount int = 2
)
var (
procStatHistory [historyCount]*nux.ProcStat
psLock = new(sync.RWMutex)
)
func UpdateCpuStat() error {
ps, err := nux.CurrentProcStat()
if err != nil {
return err
}
psLock.Lock()
defer psLock.Unlock()
for i := historyCount - 1; i > 0; i-- {
procStatHistory[i] = procStatHistory[i-1]
}
procStatHistory[0] = ps
return nil
}
func deltaTotal() uint64 {
if procStatHistory[1] == nil {
return 0
}
return procStatHistory[0].Cpu.Total - procStatHistory[1].Cpu.Total
}
func CpuIdle() float64 {
psLock.RLock()
defer psLock.RUnlock()
dt := deltaTotal()
if dt == 0 {
return 0.0
}
invQuotient := 100.00 / float64(dt)
return float64(procStatHistory[0].Cpu.Idle-procStatHistory[1].Cpu.Idle) * invQuotient
}
func CpuUser() float64 {
psLock.RLock()
defer psLock.RUnlock()
dt := deltaTotal()
if dt == 0 {
return 0.0
}
invQuotient := 100.00 / float64(dt)
return float64(procStatHistory[0].Cpu.User-procStatHistory[1].Cpu.User) * invQuotient
}
func CpuNice() float64 {
psLock.RLock()
defer psLock.RUnlock()
dt := deltaTotal()
if dt == 0 {
return 0.0
}
invQuotient := 100.00 / float64(dt)
return float64(procStatHistory[0].Cpu.Nice-procStatHistory[1].Cpu.Nice) * invQuotient
}
func CpuSystem() float64 {
psLock.RLock()
defer psLock.RUnlock()
dt := deltaTotal()
if dt == 0 {
return 0.0
}
invQuotient := 100.00 / float64(dt)
return float64(procStatHistory[0].Cpu.System-procStatHistory[1].Cpu.System) * invQuotient
}
func CpuIowait() float64 {
psLock.RLock()
defer psLock.RUnlock()
dt := deltaTotal()
if dt == 0 {
return 0.0
}
invQuotient := 100.00 / float64(dt)
return float64(procStatHistory[0].Cpu.Iowait-procStatHistory[1].Cpu.Iowait) * invQuotient
}
func CpuIrq() float64 {
psLock.RLock()
defer psLock.RUnlock()
dt := deltaTotal()
if dt == 0 {
return 0.0
}
invQuotient := 100.00 / float64(dt)
return float64(procStatHistory[0].Cpu.Irq-procStatHistory[1].Cpu.Irq) * invQuotient
}
func CpuSoftIrq() float64 {
psLock.RLock()
defer psLock.RUnlock()
dt := deltaTotal()
if dt == 0 {
return 0.0
}
invQuotient := 100.00 / float64(dt)
return float64(procStatHistory[0].Cpu.SoftIrq-procStatHistory[1].Cpu.SoftIrq) * invQuotient
}
func CpuSteal() float64 {
psLock.RLock()
defer psLock.RUnlock()
dt := deltaTotal()
if dt == 0 {
return 0.0
}
invQuotient := 100.00 / float64(dt)
return float64(procStatHistory[0].Cpu.Steal-procStatHistory[1].Cpu.Steal) * invQuotient
}
func CpuGuest() float64 {
psLock.RLock()
defer psLock.RUnlock()
dt := deltaTotal()
if dt == 0 {
return 0.0
}
invQuotient := 100.00 / float64(dt)
return float64(procStatHistory[0].Cpu.Guest-procStatHistory[1].Cpu.Guest) * invQuotient
}
func CurrentCpuSwitches() uint64 {
psLock.RLock()
defer psLock.RUnlock()
return procStatHistory[0].Ctxt
}
func CpuPrepared() bool {
psLock.RLock()
defer psLock.RUnlock()
return procStatHistory[1] != nil
}
func CpuMetrics() []*model.MetricValue {
if !CpuPrepared() {
return []*model.MetricValue{}
}
cpuIdleVal := CpuIdle()
idle := GaugeValue("cpu.idle", cpuIdleVal)
busy := GaugeValue("cpu.busy", 100.0-cpuIdleVal)
user := GaugeValue("cpu.user", CpuUser())
nice := GaugeValue("cpu.nice", CpuNice())
system := GaugeValue("cpu.system", CpuSystem())
iowait := GaugeValue("cpu.iowait", CpuIowait())
irq := GaugeValue("cpu.irq", CpuIrq())
softirq := GaugeValue("cpu.softirq", CpuSoftIrq())
steal := GaugeValue("cpu.steal", CpuSteal())
guest := GaugeValue("cpu.guest", CpuGuest())
switches := CounterValue("cpu.switches", CurrentCpuSwitches())
return []*model.MetricValue{idle, busy, user, nice, system, iowait, irq, softirq, steal, guest, switches}
}