status-go/vendor/github.com/containerd/cgroups
Richard Ramos b1a6607dbb chore: upgrade libp2p 2023-05-30 10:49:52 -04:00
..
stats/v1 feat: wakuv2 store (#2780) 2022-08-19 12:34:07 -04:00
.gitignore chore: bump go-waku 2022-04-06 10:36:06 -04:00
LICENSE chore: bump go-waku 2022-04-06 10:36:06 -04:00
Makefile chore: bump go-waku 2022-04-06 10:36:06 -04:00
Protobuild.toml chore: bump go-waku 2022-04-06 10:36:06 -04:00
README.md chore: upgrade libp2p 2023-05-30 10:49:52 -04:00
blkio.go feat: wakuv2 store (#2780) 2022-08-19 12:34:07 -04:00
cgroup.go chore: upgrade libp2p 2023-05-30 10:49:52 -04:00
control.go feat: wakuv2 store (#2780) 2022-08-19 12:34:07 -04:00
cpu.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
cpuacct.go chore: upgrade libp2p 2023-05-30 10:49:52 -04:00
cpuset.go chore: upgrade libp2p 2023-05-30 10:49:52 -04:00
devices.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
errors.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
freezer.go chore: upgrade libp2p 2023-05-30 10:49:52 -04:00
hierarchy.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
hugetlb.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
memory.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
named.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
net_cls.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
net_prio.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
opts.go feat: wakuv2 store (#2780) 2022-08-19 12:34:07 -04:00
paths.go feat: wakuv2 store (#2780) 2022-08-19 12:34:07 -04:00
perf_event.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
pids.go chore: upgrade libp2p 2023-05-30 10:49:52 -04:00
rdma.go chore: upgrade libp2p 2023-05-30 10:49:52 -04:00
state.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
subsystem.go feat: wakuv2 store (#2780) 2022-08-19 12:34:07 -04:00
systemd.go feat: wakuv2 store (#2780) 2022-08-19 12:34:07 -04:00
ticks.go chore: bump go-waku 2022-04-06 10:36:06 -04:00
utils.go chore: upgrade libp2p 2023-05-30 10:49:52 -04:00
v1.go chore: bump go-waku 2022-04-06 10:36:06 -04:00

README.md

cgroups

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Go package for creating, managing, inspecting, and destroying cgroups. The resources format for settings on the cgroup uses the OCI runtime-spec found here.

Examples (v1)

Create a new cgroup

This creates a new cgroup using a static path for all subsystems under /test.

  • /sys/fs/cgroup/cpu/test
  • /sys/fs/cgroup/memory/test
  • etc....

It uses a single hierarchy and specifies cpu shares as a resource constraint and uses the v1 implementation of cgroups.

shares := uint64(100)
control, err := cgroups.New(cgroups.V1, cgroups.StaticPath("/test"), &specs.LinuxResources{
    CPU: &specs.LinuxCPU{
        Shares: &shares,
    },
})
defer control.Delete()

Create with systemd slice support

control, err := cgroups.New(cgroups.Systemd, cgroups.Slice("system.slice", "runc-test"), &specs.LinuxResources{
    CPU: &specs.CPU{
        Shares: &shares,
    },
})

Load an existing cgroup

control, err = cgroups.Load(cgroups.V1, cgroups.StaticPath("/test"))

Add a process to the cgroup

if err := control.Add(cgroups.Process{Pid:1234}); err != nil {
}

Update the cgroup

To update the resources applied in the cgroup

shares = uint64(200)
if err := control.Update(&specs.LinuxResources{
    CPU: &specs.LinuxCPU{
        Shares: &shares,
    },
}); err != nil {
}

Freeze and Thaw the cgroup

if err := control.Freeze(); err != nil {
}
if err := control.Thaw(); err != nil {
}

List all processes in the cgroup or recursively

processes, err := control.Processes(cgroups.Devices, recursive)

Get Stats on the cgroup

stats, err := control.Stat()

By adding cgroups.IgnoreNotExist all non-existent files will be ignored, e.g. swap memory stats without swap enabled

stats, err := control.Stat(cgroups.IgnoreNotExist)

Move process across cgroups

This allows you to take processes from one cgroup and move them to another.

err := control.MoveTo(destination)

Create subcgroup

subCgroup, err := control.New("child", resources)

Registering for memory events

This allows you to get notified by an eventfd for v1 memory cgroups events.

event := cgroups.MemoryThresholdEvent(50 * 1024 * 1024, false)
efd, err := control.RegisterMemoryEvent(event)
event := cgroups.MemoryPressureEvent(cgroups.MediumPressure, cgroups.DefaultMode)
efd, err := control.RegisterMemoryEvent(event)
efd, err := control.OOMEventFD()
// or by using RegisterMemoryEvent
event := cgroups.OOMEvent()
efd, err := control.RegisterMemoryEvent(event)

Examples (v2/unified)

Check that the current system is running cgroups v2

var cgroupV2 bool
if cgroups.Mode() == cgroups.Unified {
	cgroupV2 = true
}

Create a new cgroup

This creates a new systemd v2 cgroup slice. Systemd slices consider "-" a special character, so the resulting slice would be located here on disk:

  • /sys/fs/cgroup/my.slice/my-cgroup.slice/my-cgroup-abc.slice
import (
    cgroupsv2 "github.com/containerd/cgroups/v2"
    specs "github.com/opencontainers/runtime-spec/specs-go"
)

res := cgroupsv2.Resources{}
// dummy PID of -1 is used for creating a "general slice" to be used as a parent cgroup.
// see https://github.com/containerd/cgroups/blob/1df78138f1e1e6ee593db155c6b369466f577651/v2/manager.go#L732-L735
m, err := cgroupsv2.NewSystemd("/", "my-cgroup-abc.slice", -1, &res)
if err != nil {
	return err
}

Load an existing cgroup

m, err := cgroupsv2.LoadSystemd("/", "my-cgroup-abc.slice")
if err != nil {
	return err
}

Delete a cgroup

m, err := cgroupsv2.LoadSystemd("/", "my-cgroup-abc.slice")
if err != nil {
	return err
}
err = m.DeleteSystemd()
if err != nil {
	return err
}

Attention

All static path should not include /sys/fs/cgroup/ prefix, it should start with your own cgroups name

Project details

Cgroups is a containerd sub-project, licensed under the Apache 2.0 license. As a containerd sub-project, you will find the:

information in our containerd/project repository.