245 lines
7.0 KiB
Go
245 lines
7.0 KiB
Go
// Copyright 2018 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.
|
|
|
|
package procfs
|
|
|
|
import (
|
|
"bufio"
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/prometheus/procfs/internal/fs"
|
|
)
|
|
|
|
// CPUStat shows how much time the cpu spend in various stages.
|
|
type CPUStat struct {
|
|
User float64
|
|
Nice float64
|
|
System float64
|
|
Idle float64
|
|
Iowait float64
|
|
IRQ float64
|
|
SoftIRQ float64
|
|
Steal float64
|
|
Guest float64
|
|
GuestNice float64
|
|
}
|
|
|
|
// SoftIRQStat represent the softirq statistics as exported in the procfs stat file.
|
|
// A nice introduction can be found at https://0xax.gitbooks.io/linux-insides/content/interrupts/interrupts-9.html
|
|
// It is possible to get per-cpu stats by reading /proc/softirqs
|
|
type SoftIRQStat struct {
|
|
Hi uint64
|
|
Timer uint64
|
|
NetTx uint64
|
|
NetRx uint64
|
|
Block uint64
|
|
BlockIoPoll uint64
|
|
Tasklet uint64
|
|
Sched uint64
|
|
Hrtimer uint64
|
|
Rcu uint64
|
|
}
|
|
|
|
// Stat represents kernel/system statistics.
|
|
type Stat struct {
|
|
// Boot time in seconds since the Epoch.
|
|
BootTime uint64
|
|
// Summed up cpu statistics.
|
|
CPUTotal CPUStat
|
|
// Per-CPU statistics.
|
|
CPU []CPUStat
|
|
// Number of times interrupts were handled, which contains numbered and unnumbered IRQs.
|
|
IRQTotal uint64
|
|
// Number of times a numbered IRQ was triggered.
|
|
IRQ []uint64
|
|
// Number of times a context switch happened.
|
|
ContextSwitches uint64
|
|
// Number of times a process was created.
|
|
ProcessCreated uint64
|
|
// Number of processes currently running.
|
|
ProcessesRunning uint64
|
|
// Number of processes currently blocked (waiting for IO).
|
|
ProcessesBlocked uint64
|
|
// Number of times a softirq was scheduled.
|
|
SoftIRQTotal uint64
|
|
// Detailed softirq statistics.
|
|
SoftIRQ SoftIRQStat
|
|
}
|
|
|
|
// Parse a cpu statistics line and returns the CPUStat struct plus the cpu id (or -1 for the overall sum).
|
|
func parseCPUStat(line string) (CPUStat, int64, error) {
|
|
cpuStat := CPUStat{}
|
|
var cpu string
|
|
|
|
count, err := fmt.Sscanf(line, "%s %f %f %f %f %f %f %f %f %f %f",
|
|
&cpu,
|
|
&cpuStat.User, &cpuStat.Nice, &cpuStat.System, &cpuStat.Idle,
|
|
&cpuStat.Iowait, &cpuStat.IRQ, &cpuStat.SoftIRQ, &cpuStat.Steal,
|
|
&cpuStat.Guest, &cpuStat.GuestNice)
|
|
|
|
if err != nil && err != io.EOF {
|
|
return CPUStat{}, -1, fmt.Errorf("couldn't parse %s (cpu): %s", line, err)
|
|
}
|
|
if count == 0 {
|
|
return CPUStat{}, -1, fmt.Errorf("couldn't parse %s (cpu): 0 elements parsed", line)
|
|
}
|
|
|
|
cpuStat.User /= userHZ
|
|
cpuStat.Nice /= userHZ
|
|
cpuStat.System /= userHZ
|
|
cpuStat.Idle /= userHZ
|
|
cpuStat.Iowait /= userHZ
|
|
cpuStat.IRQ /= userHZ
|
|
cpuStat.SoftIRQ /= userHZ
|
|
cpuStat.Steal /= userHZ
|
|
cpuStat.Guest /= userHZ
|
|
cpuStat.GuestNice /= userHZ
|
|
|
|
if cpu == "cpu" {
|
|
return cpuStat, -1, nil
|
|
}
|
|
|
|
cpuID, err := strconv.ParseInt(cpu[3:], 10, 64)
|
|
if err != nil {
|
|
return CPUStat{}, -1, fmt.Errorf("couldn't parse %s (cpu/cpuid): %s", line, err)
|
|
}
|
|
|
|
return cpuStat, cpuID, nil
|
|
}
|
|
|
|
// Parse a softirq line.
|
|
func parseSoftIRQStat(line string) (SoftIRQStat, uint64, error) {
|
|
softIRQStat := SoftIRQStat{}
|
|
var total uint64
|
|
var prefix string
|
|
|
|
_, err := fmt.Sscanf(line, "%s %d %d %d %d %d %d %d %d %d %d %d",
|
|
&prefix, &total,
|
|
&softIRQStat.Hi, &softIRQStat.Timer, &softIRQStat.NetTx, &softIRQStat.NetRx,
|
|
&softIRQStat.Block, &softIRQStat.BlockIoPoll,
|
|
&softIRQStat.Tasklet, &softIRQStat.Sched,
|
|
&softIRQStat.Hrtimer, &softIRQStat.Rcu)
|
|
|
|
if err != nil {
|
|
return SoftIRQStat{}, 0, fmt.Errorf("couldn't parse %s (softirq): %s", line, err)
|
|
}
|
|
|
|
return softIRQStat, total, nil
|
|
}
|
|
|
|
// NewStat returns information about current cpu/process statistics.
|
|
// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
|
|
//
|
|
// Deprecated: use fs.Stat() instead
|
|
func NewStat() (Stat, error) {
|
|
fs, err := NewFS(fs.DefaultProcMountPoint)
|
|
if err != nil {
|
|
return Stat{}, err
|
|
}
|
|
return fs.Stat()
|
|
}
|
|
|
|
// NewStat returns information about current cpu/process statistics.
|
|
// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
|
|
//
|
|
// Deprecated: use fs.Stat() instead
|
|
func (fs FS) NewStat() (Stat, error) {
|
|
return fs.Stat()
|
|
}
|
|
|
|
// Stat returns information about current cpu/process statistics.
|
|
// See https://www.kernel.org/doc/Documentation/filesystems/proc.txt
|
|
func (fs FS) Stat() (Stat, error) {
|
|
|
|
f, err := os.Open(fs.proc.Path("stat"))
|
|
if err != nil {
|
|
return Stat{}, err
|
|
}
|
|
defer f.Close()
|
|
|
|
stat := Stat{}
|
|
|
|
scanner := bufio.NewScanner(f)
|
|
for scanner.Scan() {
|
|
line := scanner.Text()
|
|
parts := strings.Fields(scanner.Text())
|
|
// require at least <key> <value>
|
|
if len(parts) < 2 {
|
|
continue
|
|
}
|
|
switch {
|
|
case parts[0] == "btime":
|
|
if stat.BootTime, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
|
|
return Stat{}, fmt.Errorf("couldn't parse %s (btime): %s", parts[1], err)
|
|
}
|
|
case parts[0] == "intr":
|
|
if stat.IRQTotal, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
|
|
return Stat{}, fmt.Errorf("couldn't parse %s (intr): %s", parts[1], err)
|
|
}
|
|
numberedIRQs := parts[2:]
|
|
stat.IRQ = make([]uint64, len(numberedIRQs))
|
|
for i, count := range numberedIRQs {
|
|
if stat.IRQ[i], err = strconv.ParseUint(count, 10, 64); err != nil {
|
|
return Stat{}, fmt.Errorf("couldn't parse %s (intr%d): %s", count, i, err)
|
|
}
|
|
}
|
|
case parts[0] == "ctxt":
|
|
if stat.ContextSwitches, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
|
|
return Stat{}, fmt.Errorf("couldn't parse %s (ctxt): %s", parts[1], err)
|
|
}
|
|
case parts[0] == "processes":
|
|
if stat.ProcessCreated, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
|
|
return Stat{}, fmt.Errorf("couldn't parse %s (processes): %s", parts[1], err)
|
|
}
|
|
case parts[0] == "procs_running":
|
|
if stat.ProcessesRunning, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
|
|
return Stat{}, fmt.Errorf("couldn't parse %s (procs_running): %s", parts[1], err)
|
|
}
|
|
case parts[0] == "procs_blocked":
|
|
if stat.ProcessesBlocked, err = strconv.ParseUint(parts[1], 10, 64); err != nil {
|
|
return Stat{}, fmt.Errorf("couldn't parse %s (procs_blocked): %s", parts[1], err)
|
|
}
|
|
case parts[0] == "softirq":
|
|
softIRQStats, total, err := parseSoftIRQStat(line)
|
|
if err != nil {
|
|
return Stat{}, err
|
|
}
|
|
stat.SoftIRQTotal = total
|
|
stat.SoftIRQ = softIRQStats
|
|
case strings.HasPrefix(parts[0], "cpu"):
|
|
cpuStat, cpuID, err := parseCPUStat(line)
|
|
if err != nil {
|
|
return Stat{}, err
|
|
}
|
|
if cpuID == -1 {
|
|
stat.CPUTotal = cpuStat
|
|
} else {
|
|
for int64(len(stat.CPU)) <= cpuID {
|
|
stat.CPU = append(stat.CPU, CPUStat{})
|
|
}
|
|
stat.CPU[cpuID] = cpuStat
|
|
}
|
|
}
|
|
}
|
|
|
|
if err := scanner.Err(); err != nil {
|
|
return Stat{}, fmt.Errorf("couldn't parse %s: %s", f.Name(), err)
|
|
}
|
|
|
|
return stat, nil
|
|
}
|