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// Copyright 2020 The Prometheus 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.
//go:build !windows
// +build !windows
package procfs
import (
"bufio"
"errors"
"fmt"
"os"
"regexp"
"strconv"
"strings"
"github.com/prometheus/procfs/internal/util"
)
var (
// match the header line before each mapped zone in `/proc/pid/smaps`.
procSMapsHeaderLine = regexp.MustCompile(`^[a-f0-9].*$`)
)
type ProcSMapsRollup struct {
// Amount of the mapping that is currently resident in RAM.
Rss uint64
// Process's proportional share of this mapping.
Pss uint64
// Size in bytes of clean shared pages.
SharedClean uint64
// Size in bytes of dirty shared pages.
SharedDirty uint64
// Size in bytes of clean private pages.
PrivateClean uint64
// Size in bytes of dirty private pages.
PrivateDirty uint64
// Amount of memory currently marked as referenced or accessed.
Referenced uint64
// Amount of memory that does not belong to any file.
Anonymous uint64
// Amount would-be-anonymous memory currently on swap.
Swap uint64
// Process's proportional memory on swap.
SwapPss uint64
}
// ProcSMapsRollup reads from /proc/[pid]/smaps_rollup to get summed memory information of the
// process.
//
// If smaps_rollup does not exists (require kernel >= 4.15), the content of /proc/pid/smaps will
// we read and summed.
func (p Proc) ProcSMapsRollup() (ProcSMapsRollup, error) {
data, err := util.ReadFileNoStat(p.path("smaps_rollup"))
if err != nil && os.IsNotExist(err) {
return p.procSMapsRollupManual()
}
if err != nil {
return ProcSMapsRollup{}, err
}
lines := strings.Split(string(data), "\n")
smaps := ProcSMapsRollup{}
// skip first line which don't contains information we need
lines = lines[1:]
for _, line := range lines {
if line == "" {
continue
}
if err := smaps.parseLine(line); err != nil {
return ProcSMapsRollup{}, err
}
}
return smaps, nil
}
// Read /proc/pid/smaps and do the roll-up in Go code.
func (p Proc) procSMapsRollupManual() (ProcSMapsRollup, error) {
file, err := os.Open(p.path("smaps"))
if err != nil {
return ProcSMapsRollup{}, err
}
defer file.Close()
smaps := ProcSMapsRollup{}
scan := bufio.NewScanner(file)
for scan.Scan() {
line := scan.Text()
if procSMapsHeaderLine.MatchString(line) {
continue
}
if err := smaps.parseLine(line); err != nil {
return ProcSMapsRollup{}, err
}
}
return smaps, nil
}
func (s *ProcSMapsRollup) parseLine(line string) error {
kv := strings.SplitN(line, ":", 2)
if len(kv) != 2 {
fmt.Println(line)
return errors.New("invalid net/dev line, missing colon")
}
k := kv[0]
if k == "VmFlags" {
return nil
}
v := strings.TrimSpace(kv[1])
v = strings.TrimRight(v, " kB")
vKBytes, err := strconv.ParseUint(v, 10, 64)
if err != nil {
return err
}
vBytes := vKBytes * 1024
s.addValue(k, vBytes)
return nil
}
func (s *ProcSMapsRollup) addValue(k string, vUintBytes uint64) {
switch k {
case "Rss":
s.Rss += vUintBytes
case "Pss":
s.Pss += vUintBytes
case "Shared_Clean":
s.SharedClean += vUintBytes
case "Shared_Dirty":
s.SharedDirty += vUintBytes
case "Private_Clean":
s.PrivateClean += vUintBytes
case "Private_Dirty":
s.PrivateDirty += vUintBytes
case "Referenced":
s.Referenced += vUintBytes
case "Anonymous":
s.Anonymous += vUintBytes
case "Swap":
s.Swap += vUintBytes
case "SwapPss":
s.SwapPss += vUintBytes
}
}
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