cgroups

package
v1.0.0-rc9 Latest Latest
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 Go to latest Published: Sep 30, 2019 License: Apache-2.0 Imports: 13 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	CgroupNamePrefix = "name="
	CgroupProcesses  = "cgroup.procs"
)

Variables

View Source 
var HugePageSizeUnitList = []string{"B", "KB", "MB", "GB", "TB", "PB"}

HugePageSizeUnitList is a list of the units used by the linux kernel when naming the HugePage control files. https://www.kernel.org/doc/Documentation/cgroup-v1/hugetlb.txt TODO Since the kernel only use KB, MB and GB; TB and PB should be removed, depends on https://github.com/docker/go-units/commit/a09cd47f892041a4fac473133d181f5aea6fa393

Functions

func EnterPid 

func EnterPid(cgroupPaths map[string]string, pid int) error

func FindCgroupMountpoint 

func FindCgroupMountpoint(cgroupPath, subsystem string) (string, error)

https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt

func FindCgroupMountpointAndRoot added in v0.0.4 

func FindCgroupMountpointAndRoot(cgroupPath, subsystem string) (string, string, error)

func FindCgroupMountpointDir 

func FindCgroupMountpointDir() (string, error)

func GetAllPids added in v0.0.7 

func GetAllPids(path string) ([]int, error)

GetAllPids returns all pids, that were added to cgroup at path and to all its subcgroups.

func GetAllSubsystems 

func GetAllSubsystems() ([]string, error)

GetAllSubsystems returns all the cgroup subsystems supported by the kernel

func GetClosestMountpointAncestor 

func GetClosestMountpointAncestor(dir, mountinfo string) string

func GetHugePageSize 

func GetHugePageSize() ([]string, error)

func GetInitCgroup 

func GetInitCgroup(subsystem string) (string, error)

func GetInitCgroupPath 

func GetInitCgroupPath(subsystem string) (string, error)

func GetOwnCgroup 

func GetOwnCgroup(subsystem string) (string, error)

GetOwnCgroup returns the relative path to the cgroup docker is running in.

func GetOwnCgroupPath 

func GetOwnCgroupPath(subsystem string) (string, error)

func GetPids added in v0.0.5 

func GetPids(path string) ([]int, error)

GetPids returns all pids, that were added to cgroup at path.

func IsCgroup2UnifiedMode 

func IsCgroup2UnifiedMode() bool

IsCgroup2UnifiedMode returns whether we are running in cgroup v2 unified mode.

func IsNotFound 

func IsNotFound(err error) bool

func NewNotFoundError 

func NewNotFoundError(sub string) error

func ParseCgroupFile 

func ParseCgroupFile(path string) (map[string]string, error)

ParseCgroupFile parses the given cgroup file, typically from /proc/<pid>/cgroup, into a map of subgroups to cgroup names.

func PathExists 

func PathExists(path string) bool

func RemovePaths 

func RemovePaths(paths map[string]string) (err error)

RemovePaths iterates over the provided paths removing them. We trying to remove all paths five times with increasing delay between tries. If after all there are not removed cgroups - appropriate error will be returned.

func WriteCgroupProc 

func WriteCgroupProc(dir string, pid int) error

WriteCgroupProc writes the specified pid into the cgroup's cgroup.procs file

Types

type BlkioStatEntry 

type BlkioStatEntry struct {
	Major uint64 `json:"major,omitempty"`
	Minor uint64 `json:"minor,omitempty"`
	Op    string `json:"op,omitempty"`
	Value uint64 `json:"value,omitempty"`
}

type BlkioStats 

type BlkioStats struct {
	// number of bytes tranferred to and from the block device
	IoServiceBytesRecursive []BlkioStatEntry `json:"io_service_bytes_recursive,omitempty"`
	IoServicedRecursive     []BlkioStatEntry `json:"io_serviced_recursive,omitempty"`
	IoQueuedRecursive       []BlkioStatEntry `json:"io_queue_recursive,omitempty"`
	IoServiceTimeRecursive  []BlkioStatEntry `json:"io_service_time_recursive,omitempty"`
	IoWaitTimeRecursive     []BlkioStatEntry `json:"io_wait_time_recursive,omitempty"`
	IoMergedRecursive       []BlkioStatEntry `json:"io_merged_recursive,omitempty"`
	IoTimeRecursive         []BlkioStatEntry `json:"io_time_recursive,omitempty"`
	SectorsRecursive        []BlkioStatEntry `json:"sectors_recursive,omitempty"`
}

type CpuStats 

type CpuStats struct {
	CpuUsage       CpuUsage       `json:"cpu_usage,omitempty"`
	ThrottlingData ThrottlingData `json:"throttling_data,omitempty"`
}

type CpuUsage 

type CpuUsage struct {
	// Total CPU time consumed.
	// Units: nanoseconds.
	TotalUsage uint64 `json:"total_usage,omitempty"`
	// Total CPU time consumed per core.
	// Units: nanoseconds.
	PercpuUsage []uint64 `json:"percpu_usage,omitempty"`
	// Time spent by tasks of the cgroup in kernel mode.
	// Units: nanoseconds.
	UsageInKernelmode uint64 `json:"usage_in_kernelmode"`
	// Time spent by tasks of the cgroup in user mode.
	// Units: nanoseconds.
	UsageInUsermode uint64 `json:"usage_in_usermode"`
}

CpuUsage denotes the usage of a CPU. All CPU stats are aggregate since container inception.

type HugetlbStats 

type HugetlbStats struct {
	// current res_counter usage for hugetlb
	Usage uint64 `json:"usage,omitempty"`
	// maximum usage ever recorded.
	MaxUsage uint64 `json:"max_usage,omitempty"`
	// number of times hugetlb usage allocation failure.
	Failcnt uint64 `json:"failcnt"`
}

type Manager 

type Manager interface {
	// Applies cgroup configuration to the process with the specified pid
	Apply(pid int) error

	// Returns the PIDs inside the cgroup set
	GetPids() ([]int, error)

	// Returns the PIDs inside the cgroup set & all sub-cgroups
	GetAllPids() ([]int, error)

	// Returns statistics for the cgroup set
	GetStats() (*Stats, error)

	// Toggles the freezer cgroup according with specified state
	Freeze(state configs.FreezerState) error

	// Destroys the cgroup set
	Destroy() error

	// Returns cgroup paths to save in a state file and to be able to
	// restore the object later.
	GetPaths() map[string]string

	// Sets the cgroup as configured.
	Set(container *configs.Config) error
}

type MemoryData 

type MemoryData struct {
	Usage    uint64 `json:"usage,omitempty"`
	MaxUsage uint64 `json:"max_usage,omitempty"`
	Failcnt  uint64 `json:"failcnt"`
	Limit    uint64 `json:"limit"`
}

type MemoryStats 

type MemoryStats struct {
	// memory used for cache
	Cache uint64 `json:"cache,omitempty"`
	// usage of memory
	Usage MemoryData `json:"usage,omitempty"`
	// usage of memory + swap
	SwapUsage MemoryData `json:"swap_usage,omitempty"`
	// usage of kernel memory
	KernelUsage MemoryData `json:"kernel_usage,omitempty"`
	// usage of kernel TCP memory
	KernelTCPUsage MemoryData `json:"kernel_tcp_usage,omitempty"`
	// if true, memory usage is accounted for throughout a hierarchy of cgroups.
	UseHierarchy bool `json:"use_hierarchy"`

	Stats map[string]uint64 `json:"stats,omitempty"`
}

type Mount 

type Mount struct {
	Mountpoint string
	Root       string
	Subsystems []string
}

func GetCgroupMounts 

func GetCgroupMounts(all bool) ([]Mount, error)

GetCgroupMounts returns the mounts for the cgroup subsystems. all indicates whether to return just the first instance or all the mounts.

func (Mount) GetOwnCgroup 

func (m Mount) GetOwnCgroup(cgroups map[string]string) (string, error)

type NotFoundError 

type NotFoundError struct {
	Subsystem string
}

func (*NotFoundError) Error 

func (e *NotFoundError) Error() string

type PidsStats added in v0.0.7 

type PidsStats struct {
	// number of pids in the cgroup
	Current uint64 `json:"current,omitempty"`
	// active pids hard limit
	Limit uint64 `json:"limit,omitempty"`
}

type Stats 

type Stats struct {
	CpuStats    CpuStats    `json:"cpu_stats,omitempty"`
	MemoryStats MemoryStats `json:"memory_stats,omitempty"`
	PidsStats   PidsStats   `json:"pids_stats,omitempty"`
	BlkioStats  BlkioStats  `json:"blkio_stats,omitempty"`
	// the map is in the format "size of hugepage: stats of the hugepage"
	HugetlbStats map[string]HugetlbStats `json:"hugetlb_stats,omitempty"`
}

func NewStats 

func NewStats() *Stats

type ThrottlingData 

type ThrottlingData struct {
	// Number of periods with throttling active
	Periods uint64 `json:"periods,omitempty"`
	// Number of periods when the container hit its throttling limit.
	ThrottledPeriods uint64 `json:"throttled_periods,omitempty"`
	// Aggregate time the container was throttled for in nanoseconds.
	ThrottledTime uint64 `json:"throttled_time,omitempty"`
}

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