mirror of
https://github.com/TwiN/gatus.git
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166 lines
3.8 KiB
Go
166 lines
3.8 KiB
Go
// Copyright 2020 The Prometheus Authors
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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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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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// +build !windows
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package procfs
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import (
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"bufio"
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"errors"
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"fmt"
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"os"
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"regexp"
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"strconv"
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"strings"
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"github.com/prometheus/procfs/internal/util"
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)
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var (
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// match the header line before each mapped zone in /proc/pid/smaps
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procSMapsHeaderLine = regexp.MustCompile(`^[a-f0-9].*$`)
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)
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type ProcSMapsRollup struct {
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// Amount of the mapping that is currently resident in RAM
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Rss uint64
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// Process's proportional share of this mapping
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Pss uint64
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// Size in bytes of clean shared pages
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SharedClean uint64
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// Size in bytes of dirty shared pages
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SharedDirty uint64
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// Size in bytes of clean private pages
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PrivateClean uint64
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// Size in bytes of dirty private pages
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PrivateDirty uint64
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// Amount of memory currently marked as referenced or accessed
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Referenced uint64
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// Amount of memory that does not belong to any file
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Anonymous uint64
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// Amount would-be-anonymous memory currently on swap
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Swap uint64
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// Process's proportional memory on swap
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SwapPss uint64
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}
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// ProcSMapsRollup reads from /proc/[pid]/smaps_rollup to get summed memory information of the
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// process.
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//
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// If smaps_rollup does not exists (require kernel >= 4.15), the content of /proc/pid/smaps will
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// we read and summed.
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func (p Proc) ProcSMapsRollup() (ProcSMapsRollup, error) {
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data, err := util.ReadFileNoStat(p.path("smaps_rollup"))
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if err != nil && os.IsNotExist(err) {
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return p.procSMapsRollupManual()
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}
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if err != nil {
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return ProcSMapsRollup{}, err
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}
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lines := strings.Split(string(data), "\n")
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smaps := ProcSMapsRollup{}
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// skip first line which don't contains information we need
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lines = lines[1:]
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for _, line := range lines {
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if line == "" {
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continue
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}
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if err := smaps.parseLine(line); err != nil {
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return ProcSMapsRollup{}, err
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}
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}
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return smaps, nil
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}
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// Read /proc/pid/smaps and do the roll-up in Go code.
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func (p Proc) procSMapsRollupManual() (ProcSMapsRollup, error) {
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file, err := os.Open(p.path("smaps"))
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if err != nil {
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return ProcSMapsRollup{}, err
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}
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defer file.Close()
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smaps := ProcSMapsRollup{}
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scan := bufio.NewScanner(file)
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for scan.Scan() {
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line := scan.Text()
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if procSMapsHeaderLine.MatchString(line) {
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continue
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}
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if err := smaps.parseLine(line); err != nil {
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return ProcSMapsRollup{}, err
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}
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}
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return smaps, nil
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}
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func (s *ProcSMapsRollup) parseLine(line string) error {
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kv := strings.SplitN(line, ":", 2)
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if len(kv) != 2 {
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fmt.Println(line)
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return errors.New("invalid net/dev line, missing colon")
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}
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k := kv[0]
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if k == "VmFlags" {
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return nil
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}
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v := strings.TrimSpace(kv[1])
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v = strings.TrimRight(v, " kB")
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vKBytes, err := strconv.ParseUint(v, 10, 64)
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if err != nil {
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return err
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}
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vBytes := vKBytes * 1024
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s.addValue(k, v, vKBytes, vBytes)
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return nil
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}
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func (s *ProcSMapsRollup) addValue(k string, vString string, vUint uint64, vUintBytes uint64) {
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switch k {
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case "Rss":
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s.Rss += vUintBytes
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case "Pss":
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s.Pss += vUintBytes
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case "Shared_Clean":
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s.SharedClean += vUintBytes
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case "Shared_Dirty":
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s.SharedDirty += vUintBytes
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case "Private_Clean":
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s.PrivateClean += vUintBytes
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case "Private_Dirty":
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s.PrivateDirty += vUintBytes
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case "Referenced":
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s.Referenced += vUintBytes
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case "Anonymous":
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s.Anonymous += vUintBytes
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case "Swap":
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s.Swap += vUintBytes
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case "SwapPss":
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s.SwapPss += vUintBytes
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}
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}
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