gtsocial-umbx

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subsystem.go (2538B)

      1 /*
      2    Copyright The containerd Authors.
      3 
      4    Licensed under the Apache License, Version 2.0 (the "License");
      5    you may not use this file except in compliance with the License.
      6    You may obtain a copy of the License at
      7 
      8        http://www.apache.org/licenses/LICENSE-2.0
      9 
     10    Unless required by applicable law or agreed to in writing, software
     11    distributed under the License is distributed on an "AS IS" BASIS,
     12    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13    See the License for the specific language governing permissions and
     14    limitations under the License.
     15 */
     16 
     17 package cgroup1
     18 
     19 import (
     20 	"fmt"
     21 	"os"
     22 
     23 	"github.com/containerd/cgroups/v3"
     24 	v1 "github.com/containerd/cgroups/v3/cgroup1/stats"
     25 	specs "github.com/opencontainers/runtime-spec/specs-go"
     26 )
     27 
     28 // Name is a typed name for a cgroup subsystem
     29 type Name string
     30 
     31 const (
     32 	Devices   Name = "devices"
     33 	Hugetlb   Name = "hugetlb"
     34 	Freezer   Name = "freezer"
     35 	Pids      Name = "pids"
     36 	NetCLS    Name = "net_cls"
     37 	NetPrio   Name = "net_prio"
     38 	PerfEvent Name = "perf_event"
     39 	Cpuset    Name = "cpuset"
     40 	Cpu       Name = "cpu"
     41 	Cpuacct   Name = "cpuacct"
     42 	Memory    Name = "memory"
     43 	Blkio     Name = "blkio"
     44 	Rdma      Name = "rdma"
     45 )
     46 
     47 // Subsystems returns a complete list of the default cgroups
     48 // available on most linux systems
     49 func Subsystems() []Name {
     50 	n := []Name{
     51 		Freezer,
     52 		Pids,
     53 		NetCLS,
     54 		NetPrio,
     55 		PerfEvent,
     56 		Cpuset,
     57 		Cpu,
     58 		Cpuacct,
     59 		Memory,
     60 		Blkio,
     61 		Rdma,
     62 	}
     63 	if !cgroups.RunningInUserNS() {
     64 		n = append(n, Devices)
     65 	}
     66 	if _, err := os.Stat("/sys/kernel/mm/hugepages"); err == nil {
     67 		n = append(n, Hugetlb)
     68 	}
     69 	return n
     70 }
     71 
     72 type Subsystem interface {
     73 	Name() Name
     74 }
     75 
     76 type pather interface {
     77 	Subsystem
     78 	Path(path string) string
     79 }
     80 
     81 type creator interface {
     82 	Subsystem
     83 	Create(path string, resources *specs.LinuxResources) error
     84 }
     85 
     86 type deleter interface {
     87 	Subsystem
     88 	Delete(path string) error
     89 }
     90 
     91 type stater interface {
     92 	Subsystem
     93 	Stat(path string, stats *v1.Metrics) error
     94 }
     95 
     96 type updater interface {
     97 	Subsystem
     98 	Update(path string, resources *specs.LinuxResources) error
     99 }
    100 
    101 // SingleSubsystem returns a single cgroup subsystem within the base Hierarchy
    102 func SingleSubsystem(baseHierarchy Hierarchy, subsystem Name) Hierarchy {
    103 	return func() ([]Subsystem, error) {
    104 		subsystems, err := baseHierarchy()
    105 		if err != nil {
    106 			return nil, err
    107 		}
    108 		for _, s := range subsystems {
    109 			if s.Name() == subsystem {
    110 				return []Subsystem{
    111 					s,
    112 				}, nil
    113 			}
    114 		}
    115 		return nil, fmt.Errorf("unable to find subsystem %s", subsystem)
    116 	}
    117 }