cgroup

package
v0.4.0 Latest Latest
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 Go to latest Published: Dec 21, 2023 License: Apache-2.0 Imports: 12 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// Unavailable indicates the lack of controller.
	Unavailable = Backend(0)

	// V1 indicates the controller is backed by Cgroup V1.
	V1 = Backend(1)

	// V2 indicates the controller is backed by Cgroup V2.
	V2 = Backend(2)
)

Variables

View Source 
var DeviceSchedRebalance = make(chan []string, 2)

DeviceSchedRebalance channel for scheduling a CPU rebalance.

View Source 
var ErrControllerMissing = fmt.Errorf("Cgroup controller is missing")

ErrControllerMissing indicates that the requested controller isn't setup on the system.

View Source 
var ErrUnknownVersion = fmt.Errorf("Unknown cgroup version")

ErrUnknownVersion indicates that a version other than those supported was detected during init.

Functions

func Init 

func Init()

Init initializes cgroups.

func ParseCPU 

func ParseCPU(cpuAllowance string, cpuPriority string) (int64, int64, int64, error)

ParseCPU parses CPU allowances.

func TaskSchedulerTrigger 

func TaskSchedulerTrigger(srcType string, srcName string, srcStatus string)

TaskSchedulerTrigger triggers a CPU rebalance.

Types

type Backend 

type Backend int

Backend indicates whether to use v1, v2 or unavailable.

type CGroup 

type CGroup struct {
	UnifiedCapable bool
	// contains filtered or unexported fields
}

CGroup represents the main cgroup abstraction.

func New 

func New(rw ReadWriter) (*CGroup, error)

New setups a new CGroup abstraction using the provided read/writer.

func NewFileReadWriter 

func NewFileReadWriter(pid int, unifiedCapable bool) (*CGroup, error)

NewFileReadWriter returns a CGroup instance using the filesystem as its backend.

func (*CGroup) GetBlkioWeight 

func (cg *CGroup) GetBlkioWeight() (int64, error)

GetBlkioWeight returns the currently allowed range of weights.

func (*CGroup) GetCPUAcctUsage 

func (cg *CGroup) GetCPUAcctUsage() (int64, error)

GetCPUAcctUsage returns the total CPU time in ns used by processes.

func (*CGroup) GetCPUAcctUsageAll 

func (cg *CGroup) GetCPUAcctUsageAll() (map[int64]CPUStats, error)

GetCPUAcctUsageAll returns the user and system CPU times of each CPU thread in ns used by processes.

func (*CGroup) GetCpuset 

func (cg *CGroup) GetCpuset() (string, error)

GetCpuset returns the current set of CPUs for the cgroup.

func (*CGroup) GetEffectiveCPUs 

func (cg *CGroup) GetEffectiveCPUs() (int, error)

GetEffectiveCPUs returns the total number of effective CPUs.

func (*CGroup) GetEffectiveCpuset 

func (cg *CGroup) GetEffectiveCpuset() (string, error)

GetEffectiveCpuset returns the current set of CPUs for the cgroup.

func (*CGroup) GetEffectiveMemoryLimit 

func (cg *CGroup) GetEffectiveMemoryLimit() (int64, error)

GetEffectiveMemoryLimit return the effective hard limit for memory. Returns the cgroup memory limit, or if the cgroup memory limit couldn't be determined or is larger than the total system memory, then the total system memory is returned.

func (*CGroup) GetIOStats 

func (cg *CGroup) GetIOStats() (map[string]*IOStats, error)

GetIOStats returns disk stats.

func (*CGroup) GetMemoryLimit 

func (cg *CGroup) GetMemoryLimit() (int64, error)

GetMemoryLimit return the hard limit for memory.

func (*CGroup) GetMemoryMaxUsage 

func (cg *CGroup) GetMemoryMaxUsage() (int64, error)

GetMemoryMaxUsage returns the record high for memory usage.

func (*CGroup) GetMemorySoftLimit 

func (cg *CGroup) GetMemorySoftLimit() (int64, error)

GetMemorySoftLimit returns the soft limit for memory.

func (*CGroup) GetMemoryStats 

func (cg *CGroup) GetMemoryStats() (map[string]uint64, error)

GetMemoryStats returns memory stats.

func (*CGroup) GetMemorySwapLimit 

func (cg *CGroup) GetMemorySwapLimit() (int64, error)

GetMemorySwapLimit returns the hard limit on swap usage.

func (*CGroup) GetMemorySwapMaxUsage 

func (cg *CGroup) GetMemorySwapMaxUsage() (int64, error)

GetMemorySwapMaxUsage returns the record high for swap usage.

func (*CGroup) GetMemorySwapUsage 

func (cg *CGroup) GetMemorySwapUsage() (int64, error)

GetMemorySwapUsage return current usage of swap.

func (*CGroup) GetMemoryUsage 

func (cg *CGroup) GetMemoryUsage() (int64, error)

GetMemoryUsage returns the current use of memory.

func (*CGroup) GetOOMKills 

func (cg *CGroup) GetOOMKills() (int64, error)

GetOOMKills returns the number of oom kills.

func (*CGroup) GetProcessesUsage 

func (cg *CGroup) GetProcessesUsage() (int64, error)

GetProcessesUsage returns the current number of pids.

func (*CGroup) SetBlkioLimit 

func (cg *CGroup) SetBlkioLimit(dev string, oType string, uType string, limit int64) error

SetBlkioLimit sets the specified read or write limit for a device.

func (*CGroup) SetBlkioWeight 

func (cg *CGroup) SetBlkioWeight(limit int64) error

SetBlkioWeight sets the currently allowed range of weights.

func (*CGroup) SetCPUCfsLimit 

func (cg *CGroup) SetCPUCfsLimit(limitPeriod int64, limitQuota int64) error

SetCPUCfsLimit sets the quota and duration in ms for each scheduling period.

func (*CGroup) SetCPUShare 

func (cg *CGroup) SetCPUShare(limit int64) error

SetCPUShare sets the weight of each group in the same hierarchy.

func (*CGroup) SetCpuset 

func (cg *CGroup) SetCpuset(limit string) error

SetCpuset set the currently allowed set of CPUs for the cgroups.

func (*CGroup) SetHugepagesLimit 

func (cg *CGroup) SetHugepagesLimit(pageType string, limit int64) error

SetHugepagesLimit applies a limit to the number of processes.

func (*CGroup) SetMaxProcesses 

func (cg *CGroup) SetMaxProcesses(limit int64) error

SetMaxProcesses applies a limit to the number of processes.

func (*CGroup) SetMemoryLimit 

func (cg *CGroup) SetMemoryLimit(limit int64) error

SetMemoryLimit sets the hard limit for memory.

func (*CGroup) SetMemorySoftLimit 

func (cg *CGroup) SetMemorySoftLimit(limit int64) error

SetMemorySoftLimit set the soft limit for memory.

func (*CGroup) SetMemorySwapLimit 

func (cg *CGroup) SetMemorySwapLimit(limit int64) error

SetMemorySwapLimit sets the hard limit for swap.

func (*CGroup) SetMemorySwappiness 

func (cg *CGroup) SetMemorySwappiness(limit int64) error

SetMemorySwappiness sets swappiness paramet of vmscan.

func (*CGroup) SetNetIfPrio 

func (cg *CGroup) SetNetIfPrio(limit string) error

SetNetIfPrio sets the priority for the process.

type CPUStats 

type CPUStats struct {
	User   int64
	System int64
}

CPUStats represent CPU stats.

type IOStats 

type IOStats struct {
	ReadBytes       uint64
	ReadsCompleted  uint64
	WrittenBytes    uint64
	WritesCompleted uint64
}

IOStats represent IO stats.

type Info 

type Info struct {
	// Layout is one of CgroupsDisabled, CgroupsUnified, CgroupsHybrid, CgroupsLegacy
	Layout Layout

	// Namespacing indicates support for the cgroup namespace
	Namespacing bool
}

Info contains system cgroup information.

func GetInfo 

func GetInfo() Info

GetInfo returns basic system cgroup information.

func (*Info) Mode 

func (info *Info) Mode() string

Mode returns the cgroup layout name.

func (*Info) Supports 

func (info *Info) Supports(resource Resource, cgroup *CGroup) bool

Supports indicates whether or not a given resource is controllable.

func (*Info) SupportsVersion 

func (info *Info) SupportsVersion(resource Resource) (Backend, bool)

SupportsVersion indicates whether or not a given cgroup resource is controllable and in which type of cgroup filesystem.

func (*Info) Warnings 

func (info *Info) Warnings() []cluster.Warning

Warnings returns a list of CGroup warnings.

type Layout 

type Layout int

Layout determines the cgroup layout on this system. 

const (
	// CgroupsDisabled indicates that cgroups are not supported.
	CgroupsDisabled Layout = iota
	// CgroupsUnified indicates that this is a pure cgroup2 layout.
	CgroupsUnified
	// CgroupsHybrid indicates that this is a mixed cgroup1 and cgroup2 layout.
	CgroupsHybrid
	// CgroupsLegacy indicates that this is a pure cgroup1 layout.
	CgroupsLegacy
)

type ReadWriter 

type ReadWriter interface {
	Get(backend Backend, controller string, key string) (string, error)
	Set(backend Backend, controller string, key string, value string) error
}

The ReadWriter interface is used to read/write cgroup data.

type Resource 

type Resource int

Resource is a generic type used to abstract resource control features support for the legacy and unified hierarchy. 

const (
	// Blkio resource control.
	Blkio Resource = iota

	// BlkioWeight resource control.
	BlkioWeight

	// CPU resource control.
	CPU

	// CPUAcct resource control.
	CPUAcct

	// CPUSet resource control.
	CPUSet

	// Devices resource control.
	Devices

	// Freezer resource control.
	Freezer

	// Hugetlb resource control.
	Hugetlb

	// Memory resource control.
	Memory

	// MemoryMaxUsage resource control.
	MemoryMaxUsage

	// MemorySwap resource control.
	MemorySwap

	// MemorySwapMaxUsage resource control.
	MemorySwapMaxUsage

	// MemorySwapUsage resource control.
	MemorySwapUsage

	// MemorySwappiness resource control.
	MemorySwappiness

	// NetPrio resource control.
	NetPrio

	// Pids resource control.
	Pids
)

Source Files

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