github.com/sams1990/dockerrepo@v17.12.1-ce-rc2+incompatible/pkg/sysinfo/sysinfo.go (about)

     1  package sysinfo
     2  
     3  import "github.com/docker/docker/pkg/parsers"
     4  
     5  // SysInfo stores information about which features a kernel supports.
     6  // TODO Windows: Factor out platform specific capabilities.
     7  type SysInfo struct {
     8  	// Whether the kernel supports AppArmor or not
     9  	AppArmor bool
    10  	// Whether the kernel supports Seccomp or not
    11  	Seccomp bool
    12  
    13  	cgroupMemInfo
    14  	cgroupCPUInfo
    15  	cgroupBlkioInfo
    16  	cgroupCpusetInfo
    17  	cgroupPids
    18  
    19  	// Whether IPv4 forwarding is supported or not, if this was disabled, networking will not work
    20  	IPv4ForwardingDisabled bool
    21  
    22  	// Whether bridge-nf-call-iptables is supported or not
    23  	BridgeNFCallIPTablesDisabled bool
    24  
    25  	// Whether bridge-nf-call-ip6tables is supported or not
    26  	BridgeNFCallIP6TablesDisabled bool
    27  
    28  	// Whether the cgroup has the mountpoint of "devices" or not
    29  	CgroupDevicesEnabled bool
    30  }
    31  
    32  type cgroupMemInfo struct {
    33  	// Whether memory limit is supported or not
    34  	MemoryLimit bool
    35  
    36  	// Whether swap limit is supported or not
    37  	SwapLimit bool
    38  
    39  	// Whether soft limit is supported or not
    40  	MemoryReservation bool
    41  
    42  	// Whether OOM killer disable is supported or not
    43  	OomKillDisable bool
    44  
    45  	// Whether memory swappiness is supported or not
    46  	MemorySwappiness bool
    47  
    48  	// Whether kernel memory limit is supported or not
    49  	KernelMemory bool
    50  }
    51  
    52  type cgroupCPUInfo struct {
    53  	// Whether CPU shares is supported or not
    54  	CPUShares bool
    55  
    56  	// Whether CPU CFS(Completely Fair Scheduler) period is supported or not
    57  	CPUCfsPeriod bool
    58  
    59  	// Whether CPU CFS(Completely Fair Scheduler) quota is supported or not
    60  	CPUCfsQuota bool
    61  
    62  	// Whether CPU real-time period is supported or not
    63  	CPURealtimePeriod bool
    64  
    65  	// Whether CPU real-time runtime is supported or not
    66  	CPURealtimeRuntime bool
    67  }
    68  
    69  type cgroupBlkioInfo struct {
    70  	// Whether Block IO weight is supported or not
    71  	BlkioWeight bool
    72  
    73  	// Whether Block IO weight_device is supported or not
    74  	BlkioWeightDevice bool
    75  
    76  	// Whether Block IO read limit in bytes per second is supported or not
    77  	BlkioReadBpsDevice bool
    78  
    79  	// Whether Block IO write limit in bytes per second is supported or not
    80  	BlkioWriteBpsDevice bool
    81  
    82  	// Whether Block IO read limit in IO per second is supported or not
    83  	BlkioReadIOpsDevice bool
    84  
    85  	// Whether Block IO write limit in IO per second is supported or not
    86  	BlkioWriteIOpsDevice bool
    87  }
    88  
    89  type cgroupCpusetInfo struct {
    90  	// Whether Cpuset is supported or not
    91  	Cpuset bool
    92  
    93  	// Available Cpuset's cpus
    94  	Cpus string
    95  
    96  	// Available Cpuset's memory nodes
    97  	Mems string
    98  }
    99  
   100  type cgroupPids struct {
   101  	// Whether Pids Limit is supported or not
   102  	PidsLimit bool
   103  }
   104  
   105  // IsCpusetCpusAvailable returns `true` if the provided string set is contained
   106  // in cgroup's cpuset.cpus set, `false` otherwise.
   107  // If error is not nil a parsing error occurred.
   108  func (c cgroupCpusetInfo) IsCpusetCpusAvailable(provided string) (bool, error) {
   109  	return isCpusetListAvailable(provided, c.Cpus)
   110  }
   111  
   112  // IsCpusetMemsAvailable returns `true` if the provided string set is contained
   113  // in cgroup's cpuset.mems set, `false` otherwise.
   114  // If error is not nil a parsing error occurred.
   115  func (c cgroupCpusetInfo) IsCpusetMemsAvailable(provided string) (bool, error) {
   116  	return isCpusetListAvailable(provided, c.Mems)
   117  }
   118  
   119  func isCpusetListAvailable(provided, available string) (bool, error) {
   120  	parsedProvided, err := parsers.ParseUintList(provided)
   121  	if err != nil {
   122  		return false, err
   123  	}
   124  	parsedAvailable, err := parsers.ParseUintList(available)
   125  	if err != nil {
   126  		return false, err
   127  	}
   128  	for k := range parsedProvided {
   129  		if !parsedAvailable[k] {
   130  			return false, nil
   131  		}
   132  	}
   133  	return true, nil
   134  }
   135  
   136  // Returns bit count of 1, used by NumCPU
   137  func popcnt(x uint64) (n byte) {
   138  	x -= (x >> 1) & 0x5555555555555555
   139  	x = (x>>2)&0x3333333333333333 + x&0x3333333333333333
   140  	x += x >> 4
   141  	x &= 0x0f0f0f0f0f0f0f0f
   142  	x *= 0x0101010101010101
   143  	return byte(x >> 56)
   144  }