| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package envoy |
| |
| import ( |
| "os" |
| "strconv" |
| "strings" |
| ) |
| |
| import ( |
| "github.com/apache/dubbo-kubernetes/pkg/proxy/cgroups" |
| ) |
| |
| type UIntOrString struct { |
| Type string |
| UInt uint64 |
| String string |
| } |
| |
| func DetectMaxMemory() uint64 { |
| switch cgroups.Mode() { |
| case cgroups.Legacy: |
| res := maybeReadAsBytes("/sys/fs/cgroup/memory.limit_in_bytes") |
| if res != nil && res.Type == "int" { |
| return res.UInt |
| } |
| case cgroups.Hybrid, cgroups.Unified: |
| res := maybeReadAsBytes("/sys/fs/cgroup/memory.max") |
| if res != nil && res.Type == "int" { |
| return res.UInt |
| } |
| } |
| return 0 |
| } |
| |
| func maybeReadAsBytes(path string) *UIntOrString { |
| byteContents, err := os.ReadFile(path) |
| if err == nil { |
| contents := strings.TrimSpace(string(byteContents)) |
| bytes, err := strconv.ParseUint(contents, 10, 64) |
| if err != nil { |
| return &UIntOrString{ |
| Type: "string", |
| String: contents, |
| } |
| } |
| return &UIntOrString{ |
| Type: "int", |
| UInt: bytes, |
| } |
| } |
| return nil |
| } |