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| 1 | +// Copyright 2018-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"). You may |
| 4 | +// not use this file except in compliance with the License. A copy of the |
| 5 | +// License is located at |
| 6 | +// |
| 7 | +// http://aws.amazon.com/apache2.0/ |
| 8 | +// |
| 9 | +// or in the "license" file accompanying this file. This file is distributed |
| 10 | +// on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
| 11 | +// express or implied. See the License for the specific language governing |
| 12 | +// permissions and limitations under the License. |
| 13 | + |
| 14 | +package cpuset |
| 15 | + |
| 16 | +import ( |
| 17 | + "fmt" |
| 18 | + "strconv" |
| 19 | + "strings" |
| 20 | +) |
| 21 | + |
| 22 | +// Builder will allow building of cpuset fields such as cpuset.cpus and |
| 23 | +// cpuset.mems |
| 24 | +// |
| 25 | +// Example: |
| 26 | +// cset := cpuset.Builder{}. |
| 27 | +// AddCPU(0). |
| 28 | +// AddMemRange(0). |
| 29 | +// Build() |
| 30 | +// |
| 31 | +// fcClient, err := fcclient.New(containerdTTRPCAddress) |
| 32 | +// if err != nil { |
| 33 | +// return err |
| 34 | +// } |
| 35 | +// |
| 36 | +// defer fcClient.Close() |
| 37 | +// |
| 38 | +// vmID := "cpuset-builder-example" |
| 39 | +// createVMRequest := &proto.CreateVMRequest{ |
| 40 | +// VMID: vmID, |
| 41 | +// JailerConfig: proto.JailerConfig{ |
| 42 | +// CPUs: cset.CPUs(), |
| 43 | +// Mems: cset.Mems(), |
| 44 | +// }, |
| 45 | +// } |
| 46 | +// |
| 47 | +// _, err = fcClient.CreateVM(ctx, createVMRequest) |
| 48 | +// if err != nil { |
| 49 | +// return errors.Wrap(err, "failed to create VM") |
| 50 | +// } |
| 51 | +type Builder struct { |
| 52 | + cpus []int |
| 53 | + cpuRanges []_range |
| 54 | + |
| 55 | + mems []int |
| 56 | + memRanges []_range |
| 57 | +} |
| 58 | + |
| 59 | +type _range struct { |
| 60 | + min, max int |
| 61 | +} |
| 62 | + |
| 63 | +func (r _range) String() string { |
| 64 | + return fmt.Sprintf("%d-%d", r.min, r.max) |
| 65 | +} |
| 66 | + |
| 67 | +// CPUSet represents the linux CPUSet which is a series of configurable values |
| 68 | +// that allow processes to run on a specific CPUs and those CPUs are then bound |
| 69 | +// to the memory nodes specified. |
| 70 | +// |
| 71 | +// More information can be found here: http://man7.org/linux/man-pages/man7/cpuset.7.html |
| 72 | +type CPUSet struct { |
| 73 | + cpus string |
| 74 | + mems string |
| 75 | +} |
| 76 | + |
| 77 | +// CPUs returns the cpuset.cpus string |
| 78 | +func (c CPUSet) CPUs() string { |
| 79 | + return c.cpus |
| 80 | +} |
| 81 | + |
| 82 | +// Mems returns the cpuset.mems string |
| 83 | +func (c CPUSet) Mems() string { |
| 84 | + return c.mems |
| 85 | +} |
| 86 | + |
| 87 | +// AddCPU will add the physical CPU number that the process is allowed to run |
| 88 | +// on. |
| 89 | +func (b Builder) AddCPU(cpu int) Builder { |
| 90 | + b.cpus = append(b.cpus, cpu) |
| 91 | + return b |
| 92 | +} |
| 93 | + |
| 94 | +// AddCPURange adds a range of physical CPU numbers that the process is allowed |
| 95 | +// to run on |
| 96 | +func (b Builder) AddCPURange(min, max int) Builder { |
| 97 | + b.cpuRanges = append(b.cpuRanges, _range{ |
| 98 | + min: min, |
| 99 | + max: max, |
| 100 | + }) |
| 101 | + |
| 102 | + return b |
| 103 | +} |
| 104 | + |
| 105 | +// AddMem adds a memory node which limits where the cpus can allocate memory |
| 106 | +func (b Builder) AddMem(mem int) Builder { |
| 107 | + b.mems = append(b.mems, mem) |
| 108 | + return b |
| 109 | +} |
| 110 | + |
| 111 | +// AddMemRange adds a range of memory nodes to be used. |
| 112 | +func (b Builder) AddMemRange(min, max int) Builder { |
| 113 | + b.memRanges = append(b.memRanges, _range{ |
| 114 | + min: min, |
| 115 | + max: max, |
| 116 | + }) |
| 117 | + |
| 118 | + return b |
| 119 | +} |
| 120 | + |
| 121 | +// Build constructs a new CPUSet |
| 122 | +func (b Builder) Build() CPUSet { |
| 123 | + cpus := stringify(b.cpus, b.cpuRanges) |
| 124 | + mems := stringify(b.mems, b.memRanges) |
| 125 | + |
| 126 | + return CPUSet{ |
| 127 | + cpus: cpus, |
| 128 | + mems: mems, |
| 129 | + } |
| 130 | +} |
| 131 | + |
| 132 | +func stringify(elems []int, ranges []_range) string { |
| 133 | + strs := []string{} |
| 134 | + for _, elem := range elems { |
| 135 | + strs = append(strs, strconv.Itoa(elem)) |
| 136 | + } |
| 137 | + |
| 138 | + for _, r := range ranges { |
| 139 | + strs = append(strs, r.String()) |
| 140 | + } |
| 141 | + |
| 142 | + return strings.Join(strs, ",") |
| 143 | +} |
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