summaryrefslogtreecommitdiff
path: root/pkg/sysinfo/sysinfo.go
blob: 686f66ce5217e2634296e985968d8e4b95111eac (plain)
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
146
147
148
149
150
151
152
153
package sysinfo

import "github.com/docker/docker/pkg/parsers"

// SysInfo stores information about which features a kernel supports.
// TODO Windows: Factor out platform specific capabilities.
type SysInfo struct {
	// Whether the kernel supports AppArmor or not
	AppArmor bool
	// Whether the kernel supports Seccomp or not
	Seccomp bool

	cgroupMemInfo
	cgroupCPUInfo
	cgroupBlkioInfo
	cgroupCpusetInfo
	cgroupPids

	// Whether IPv4 forwarding is supported or not, if this was disabled, networking will not work
	IPv4ForwardingDisabled bool

	// Whether bridge-nf-call-iptables is supported or not
	BridgeNFCallIPTablesDisabled bool

	// Whether bridge-nf-call-ip6tables is supported or not
	BridgeNFCallIP6TablesDisabled bool

	// Whether the cgroup has the mountpoint of "devices" or not
	CgroupDevicesEnabled bool
}

type cgroupMemInfo struct {
	// Whether memory limit is supported or not
	MemoryLimit bool

	// Whether swap limit is supported or not
	SwapLimit bool

	// Whether soft limit is supported or not
	MemoryReservation bool

	// Whether OOM killer disable is supported or not
	OomKillDisable bool

	// Whether memory swappiness is supported or not
	MemorySwappiness bool

	// Whether kernel memory limit is supported or not
	KernelMemory bool
}

type cgroupCPUInfo struct {
	// Whether CPU shares is supported or not
	CPUShares bool

	// Whether CPU CFS(Completely Fair Scheduler) period is supported or not
	CPUCfsPeriod bool

	// Whether CPU CFS(Completely Fair Scheduler) quota is supported or not
	CPUCfsQuota bool

	// Whether CPU real-time period is supported or not
	CPURealtimePeriod bool

	// Whether CPU real-time runtime is supported or not
	CPURealtimeRuntime bool
}

type cgroupBlkioInfo struct {
	// Whether Block IO weight is supported or not
	BlkioWeight bool

	// Whether Block IO weight_device is supported or not
	BlkioWeightDevice bool

	// Whether Block IO read limit in bytes per second is supported or not
	BlkioReadBpsDevice bool

	// Whether Block IO write limit in bytes per second is supported or not
	BlkioWriteBpsDevice bool

	// Whether Block IO read limit in IO per second is supported or not
	BlkioReadIOpsDevice bool

	// Whether Block IO write limit in IO per second is supported or not
	BlkioWriteIOpsDevice bool
}

type cgroupCpusetInfo struct {
	// Whether Cpuset is supported or not
	Cpuset bool

	// Available Cpuset's cpus
	Cpus string

	// Available Cpuset's memory nodes
	Mems string
}

type cgroupPids struct {
	// Whether Pids Limit is supported or not
	PidsLimit bool
}

// IsCpusetCpusAvailable returns `true` if the provided string set is contained
// in cgroup's cpuset.cpus set, `false` otherwise.
// If error is not nil a parsing error occurred.
func (c cgroupCpusetInfo) IsCpusetCpusAvailable(provided string) (bool, error) {
	return isCpusetListAvailable(provided, c.Cpus)
}

// IsCpusetMemsAvailable returns `true` if the provided string set is contained
// in cgroup's cpuset.mems set, `false` otherwise.
// If error is not nil a parsing error occurred.
func (c cgroupCpusetInfo) IsCpusetMemsAvailable(provided string) (bool, error) {
	return isCpusetListAvailable(provided, c.Mems)
}

func isCpusetListAvailable(provided, available string) (bool, error) {
	parsedProvided, err := parsers.ParseUintList(provided)
	if err != nil {
		return false, err
	}
	parsedAvailable, err := parsers.ParseUintList(available)
	if err != nil {
		return false, err
	}
	for k := range parsedProvided {
		if !parsedAvailable[k] {
			return false, nil
		}
	}
	return true, nil
}

// Returns bit count of 1, used by NumCPU
func popcnt(x uint64) (n byte) {
	x -= (x >> 1) & 0x5555555555555555
	x = (x>>2)&0x3333333333333333 + x&0x3333333333333333
	x += x >> 4
	x &= 0x0f0f0f0f0f0f0f0f
	x *= 0x0101010101010101
	return byte(x >> 56)
}

// GetDefaultPidsLimit returns the default pids limit to run containers with
func GetDefaultPidsLimit() int64 {
	sysInfo := New(true)
	if !sysInfo.PidsLimit {
		return 0
	}
	return 4096
}