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107 lines
3.0 KiB
107 lines
3.0 KiB
// Copyright 2018 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package memory
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import (
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"io/ioutil"
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"strconv"
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"strings"
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"github.com/shirou/gopsutil/mem"
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)
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// MemTotal returns the total amount of RAM on this system
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var MemTotal func() (uint64, error)
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// MemUsed returns the total used amount of RAM on this system
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var MemUsed func() (uint64, error)
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// MemTotalNormal returns the total amount of RAM on this system in non-container environment.
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func MemTotalNormal() (uint64, error) {
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v, err := mem.VirtualMemory()
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return v.Total, err
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}
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// MemUsedNormal returns the total used amount of RAM on this system in non-container environment.
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func MemUsedNormal() (uint64, error) {
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v, err := mem.VirtualMemory()
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return v.Used, err
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}
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const (
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cGroupMemLimitPath = "/sys/fs/cgroup/memory/memory.limit_in_bytes"
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cGroupMemUsagePath = "/sys/fs/cgroup/memory/memory.usage_in_bytes"
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selfCGroupPath = "/proc/self/cgroup"
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)
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// MemTotalCGroup returns the total amount of RAM on this system in container environment.
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func MemTotalCGroup() (uint64, error) {
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return readUint(cGroupMemLimitPath)
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}
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// MemUsedCGroup returns the total used amount of RAM on this system in container environment.
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func MemUsedCGroup() (uint64, error) {
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return readUint(cGroupMemUsagePath)
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}
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func init() {
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if inContainer() {
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MemTotal = MemTotalCGroup
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MemUsed = MemUsedCGroup
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} else {
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MemTotal = MemTotalNormal
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MemUsed = MemUsedNormal
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}
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}
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func inContainer() bool {
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v, err := ioutil.ReadFile(selfCGroupPath)
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if err != nil {
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return false
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}
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if strings.Contains(string(v), "docker") ||
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strings.Contains(string(v), "kubepods") ||
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strings.Contains(string(v), "containerd") {
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return true
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}
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return false
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}
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// refer to https://github.com/containerd/cgroups/blob/318312a373405e5e91134d8063d04d59768a1bff/utils.go#L251
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func parseUint(s string, base, bitSize int) (uint64, error) {
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v, err := strconv.ParseUint(s, base, bitSize)
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if err != nil {
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intValue, intErr := strconv.ParseInt(s, base, bitSize)
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// 1. Handle negative values greater than MinInt64 (and)
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// 2. Handle negative values lesser than MinInt64
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if intErr == nil && intValue < 0 {
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return 0, nil
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} else if intErr != nil &&
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intErr.(*strconv.NumError).Err == strconv.ErrRange &&
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intValue < 0 {
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return 0, nil
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}
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return 0, err
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}
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return v, nil
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}
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// refer to https://github.com/containerd/cgroups/blob/318312a373405e5e91134d8063d04d59768a1bff/utils.go#L243
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func readUint(path string) (uint64, error) {
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v, err := ioutil.ReadFile(path)
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if err != nil {
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return 0, err
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}
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return parseUint(strings.TrimSpace(string(v)), 10, 64)
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}
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