1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
// +build linux
package libpod
import (
"strings"
"syscall"
"time"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/podman/v3/pkg/cgroups"
"github.com/pkg/errors"
)
// GetContainerStats gets the running stats for a given container
func (c *Container) GetContainerStats(previousStats *define.ContainerStats) (*define.ContainerStats, error) {
stats := new(define.ContainerStats)
stats.ContainerID = c.ID()
stats.Name = c.Name()
if c.config.NoCgroups {
return nil, errors.Wrapf(define.ErrNoCgroups, "cannot run top on container %s as it did not create a cgroup", c.ID())
}
if !c.batched {
c.lock.Lock()
defer c.lock.Unlock()
if err := c.syncContainer(); err != nil {
return stats, err
}
}
if c.state.State != define.ContainerStateRunning && c.state.State != define.ContainerStatePaused {
return stats, define.ErrCtrStateInvalid
}
cgroupPath, err := c.cGroupPath()
if err != nil {
return nil, err
}
cgroup, err := cgroups.Load(cgroupPath)
if err != nil {
return stats, errors.Wrapf(err, "unable to load cgroup at %s", cgroupPath)
}
// Ubuntu does not have swap memory in cgroups because swap is often not enabled.
cgroupStats, err := cgroup.Stat()
if err != nil {
return stats, errors.Wrapf(err, "unable to obtain cgroup stats")
}
conState := c.state.State
netStats, err := getContainerNetIO(c)
if err != nil {
return nil, err
}
// If the current total usage in the cgroup is less than what was previously
// recorded then it means the container was restarted and runs in a new cgroup
if previousStats.Duration > cgroupStats.CPU.Usage.Total {
previousStats = &define.ContainerStats{}
}
previousCPU := previousStats.CPUNano
now := uint64(time.Now().UnixNano())
stats.Duration = cgroupStats.CPU.Usage.Total
stats.UpTime = time.Duration(stats.Duration)
stats.CPU = calculateCPUPercent(cgroupStats, previousCPU, now, previousStats.SystemNano)
stats.AvgCPU = calculateAvgCPU(stats.CPU, previousStats.AvgCPU, previousStats.DataPoints)
stats.DataPoints = previousStats.DataPoints + 1
stats.MemUsage = cgroupStats.Memory.Usage.Usage
stats.MemLimit = getMemLimit(cgroupStats.Memory.Usage.Limit)
stats.MemPerc = (float64(stats.MemUsage) / float64(stats.MemLimit)) * 100
stats.PIDs = 0
if conState == define.ContainerStateRunning || conState == define.ContainerStatePaused {
stats.PIDs = cgroupStats.Pids.Current
}
stats.BlockInput, stats.BlockOutput = calculateBlockIO(cgroupStats)
stats.CPUNano = cgroupStats.CPU.Usage.Total
stats.CPUSystemNano = cgroupStats.CPU.Usage.Kernel
stats.SystemNano = now
stats.PerCPU = cgroupStats.CPU.Usage.PerCPU
// Handle case where the container is not in a network namespace
if netStats != nil {
stats.NetInput = netStats.TxBytes
stats.NetOutput = netStats.RxBytes
} else {
stats.NetInput = 0
stats.NetOutput = 0
}
return stats, nil
}
// getMemory limit returns the memory limit for a given cgroup
// If the configured memory limit is larger than the total memory on the sys, the
// physical system memory size is returned
func getMemLimit(cgroupLimit uint64) uint64 {
si := &syscall.Sysinfo_t{}
err := syscall.Sysinfo(si)
if err != nil {
return cgroupLimit
}
//nolint:unconvert
physicalLimit := uint64(si.Totalram)
if cgroupLimit > physicalLimit {
return physicalLimit
}
return cgroupLimit
}
// calculateCPUPercent calculates the cpu usage using the latest measurement in stats.
// previousCPU is the last value of stats.CPU.Usage.Total measured at the time previousSystem.
// (now - previousSystem) is the time delta in nanoseconds, between the measurement in previousCPU
// and the updated value in stats.
func calculateCPUPercent(stats *cgroups.Metrics, previousCPU, now, previousSystem uint64) float64 {
var (
cpuPercent = 0.0
cpuDelta = float64(stats.CPU.Usage.Total - previousCPU)
systemDelta = float64(now - previousSystem)
)
if systemDelta > 0.0 && cpuDelta > 0.0 {
// gets a ratio of container cpu usage total, and multiplies that by 100 to get a percentage
cpuPercent = (cpuDelta / systemDelta) * 100
}
return cpuPercent
}
func calculateBlockIO(stats *cgroups.Metrics) (read uint64, write uint64) {
for _, blkIOEntry := range stats.Blkio.IoServiceBytesRecursive {
switch strings.ToLower(blkIOEntry.Op) {
case "read":
read += blkIOEntry.Value
case "write":
write += blkIOEntry.Value
}
}
return
}
// calculateAvgCPU calculates the avg CPU percentage given the previous average and the number of data points.
func calculateAvgCPU(statsCPU float64, prevAvg float64, prevData int64) float64 {
avgPer := ((prevAvg * float64(prevData)) + statsCPU) / (float64(prevData) + 1)
return avgPer
}
|
