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mem.go
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mem.go
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// Copyright 2018 The Chubao Authors.
//
// Licensed 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 util
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
const (
MEMINFO = "/proc/meminfo"
PRO_MEM = "/proc/%d/status"
)
// GetMemInfo returns the memory information.
func GetMemInfo() (total, used uint64, err error) {
fp, err := os.Open(MEMINFO)
if err != nil {
return
}
// TODO Unhandled errors
defer fp.Close()
var (
val uint64
free uint64
buffer uint64
cached uint64
)
scan := bufio.NewScanner(fp)
for scan.Scan() {
line := scan.Text()
fields := strings.Split(line, ":")
if len(fields) != 2 {
continue
}
key := fields[0]
value := strings.TrimSpace(fields[1])
value = strings.Replace(value, " kB", "", -1)
val, err = strconv.ParseUint(value, 10, 64)
if err != nil {
return
}
switch key {
case "MemTotal":
total = val * KB
case "MemFree":
free = val * KB
case "Buffers":
buffer = val * KB
case "Cached":
cached = val * KB
}
}
used = total - free - buffer - cached
return
}
func GetProcessMemory(pid int) (used uint64, err error) {
proFileName := fmt.Sprintf(PRO_MEM, pid)
fp, err := os.Open(proFileName)
if err != nil {
return
}
defer fp.Close()
scan := bufio.NewScanner(fp)
for scan.Scan() {
line := scan.Text()
fields := strings.Split(line, ":")
key := fields[0]
if key != "VmRSS" {
continue
}
value := strings.TrimSpace(fields[1])
value = strings.Replace(value, " kB", "", -1)
used, err = strconv.ParseUint(value, 10, 64)
if err != nil {
return
}
used = used * KB
break
}
return
}