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