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Merge pull request #186 from postmates/schedstat
Parse task queue stats from /proc/schedstat
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,128 @@ | ||
| // Copyright 2019 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" | ||
| "errors" | ||
| "os" | ||
| "regexp" | ||
| "strconv" | ||
| ) | ||
|
|
||
| var ( | ||
| cpuLineRE = regexp.MustCompile(`cpu(\d+) (\d+) (\d+) (\d+) (\d+) (\d+) (\d+) (\d+) (\d+) (\d+)`) | ||
| procLineRE = regexp.MustCompile(`(\d+) (\d+) (\d+)`) | ||
| ) | ||
|
|
||
| // Schedstat contains scheduler statistics from /proc/schedstats | ||
| // | ||
| // See | ||
| // https://www.kernel.org/doc/Documentation/scheduler/sched-stats.txt | ||
| // for a detailed description of what these numbers mean. | ||
| type Schedstat struct { | ||
| CPUs []*SchedstatCPU | ||
| } | ||
|
|
||
| // SchedstatCPU contains the values from one "cpu<N>" line | ||
| type SchedstatCPU struct { | ||
| CPUNum string | ||
|
|
||
| RunningJiffies uint64 | ||
| WaitingJiffies uint64 | ||
| RunTimeslices uint64 | ||
| } | ||
|
|
||
| // ProcSchedstat contains the values from /proc/<pid>/schedstat | ||
| type ProcSchedstat struct { | ||
| RunningJiffies uint64 | ||
| WaitingJiffies uint64 | ||
| RunTimeslices uint64 | ||
| } | ||
|
|
||
| func (fs FS) Schedstat() (*Schedstat, error) { | ||
| file, err := os.Open(fs.proc.Path("schedstat")) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| defer file.Close() | ||
|
|
||
| stats := &Schedstat{} | ||
| scanner := bufio.NewScanner(file) | ||
|
|
||
| for scanner.Scan() { | ||
| match := cpuLineRE.FindStringSubmatch(scanner.Text()) | ||
| if match != nil { | ||
| cpu := &SchedstatCPU{} | ||
| cpu.CPUNum = match[1] | ||
|
|
||
| cpu.RunningJiffies, err = strconv.ParseUint(match[8], 10, 64) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
||
| cpu.WaitingJiffies, err = strconv.ParseUint(match[9], 10, 64) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
||
| cpu.RunTimeslices, err = strconv.ParseUint(match[10], 10, 64) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
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| stats.CPUs = append(stats.CPUs, cpu) | ||
| } | ||
| } | ||
|
|
||
| return stats, nil | ||
| } | ||
|
|
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| func parseProcSchedstat(contents string) (stats ProcSchedstat, err error) { | ||
| match := procLineRE.FindStringSubmatch(contents) | ||
|
|
||
| if match != nil { | ||
| stats.RunningJiffies, err = strconv.ParseUint(match[1], 10, 64) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| stats.WaitingJiffies, err = strconv.ParseUint(match[2], 10, 64) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| stats.RunTimeslices, err = strconv.ParseUint(match[3], 10, 64) | ||
| return | ||
| } | ||
|
|
||
| err = errors.New("could not parse schedstat") | ||
| return | ||
| } | ||
|
|
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| func (stat *SchedstatCPU) RunningSeconds() float64 { | ||
| return float64(stat.RunningJiffies) / userHZ | ||
| } | ||
|
|
||
| func (stat *SchedstatCPU) WaitingSeconds() float64 { | ||
| return float64(stat.WaitingJiffies) / userHZ | ||
| } | ||
|
|
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| func (stat *ProcSchedstat) RunningSeconds() float64 { | ||
| return float64(stat.RunningJiffies) / userHZ | ||
| } | ||
|
|
||
| func (stat *ProcSchedstat) WaitingSeconds() float64 { | ||
| return float64(stat.WaitingJiffies) / userHZ | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| // Copyright 2019 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 "testing" | ||
|
|
||
| func TestSchedstat(t *testing.T) { | ||
| stats, err := getProcFixtures(t).Schedstat() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| if len(stats.CPUs) != 2 { | ||
| t.Errorf("expected 2 CPUs, got %v", len(stats.CPUs)) | ||
| } | ||
|
|
||
| var cpu *SchedstatCPU | ||
| for _, cpu = range stats.CPUs { | ||
| if cpu.CPUNum == "0" { | ||
| break | ||
| } | ||
| } | ||
|
|
||
| if cpu == nil || cpu.CPUNum != "0" { | ||
| t.Error("could not find cpu0") | ||
| } | ||
|
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| if want, have := uint64(2045936778163039), cpu.RunningJiffies; want != have { | ||
| t.Errorf("want RunningJiffies %v, have %v", want, have) | ||
| } | ||
| if want, have := float64(2045936778163039)/userHZ, cpu.RunningSeconds(); want != have { | ||
| t.Errorf("want RunningSeconds() %v, have %v", want, have) | ||
| } | ||
|
|
||
| if want, have := uint64(343796328169361), cpu.WaitingJiffies; want != have { | ||
| t.Errorf("want WaitingJiffies %v, have %v", want, have) | ||
| } | ||
| if want, have := float64(343796328169361)/userHZ, cpu.WaitingSeconds(); want != have { | ||
| t.Errorf("want WaitingSeconds() %v, have %v", want, have) | ||
| } | ||
|
|
||
| if want, have := uint64(4767485306), cpu.RunTimeslices; want != have { | ||
| t.Errorf("want RunTimeslices %v, have %v", want, have) | ||
| } | ||
| } | ||
|
|
||
| func TestProcSchedstat(t *testing.T) { | ||
| p1, err := getProcFixtures(t).Proc(26231) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| schedstat, err := p1.Schedstat() | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| if want, have := uint64(411605849), schedstat.RunningJiffies; want != have { | ||
| t.Errorf("want RunningJiffies %v, have %v", want, have) | ||
| } | ||
| if want, have := float64(411605849)/userHZ, schedstat.RunningSeconds(); want != have { | ||
| t.Errorf("want RunningSeconds() %v, have %v", want, have) | ||
| } | ||
|
|
||
| if want, have := uint64(93680043), schedstat.WaitingJiffies; want != have { | ||
| t.Errorf("want WaitingJiffies %v, have %v", want, have) | ||
| } | ||
| if want, have := float64(93680043)/userHZ, schedstat.WaitingSeconds(); want != have { | ||
| t.Errorf("want WaitingSeconds() %v, have %v", want, have) | ||
| } | ||
|
|
||
| if want, have := uint64(79), schedstat.RunTimeslices; want != have { | ||
| t.Errorf("want RunTimeslices %v, have %v", want, have) | ||
| } | ||
| } | ||
|
|
||
| func TestProcSchedstatErrors(t *testing.T) { | ||
| p1, err := getProcFixtures(t).Proc(26232) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
||
| _, err = p1.Schedstat() | ||
| if err == nil { | ||
| t.Error("proc 26232 doesn't have schedstat -- should have gotten an error") | ||
| } | ||
|
|
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| p2, err := getProcFixtures(t).Proc(26233) | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
|
|
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| _, err = p2.Schedstat() | ||
| if err == nil { | ||
| t.Error("proc 26233 has malformed schedstat -- should have gotten an error") | ||
| } | ||
| } | ||
|
|
||
| // schedstat can have a 2nd line: it should be ignored | ||
| func TestProcSchedstatMultipleLines(t *testing.T) { | ||
| schedstat, err := parseProcSchedstat("123 456 789\n10 11\n") | ||
| if err != nil { | ||
| t.Fatal(err) | ||
| } | ||
| if want, have := uint64(123), schedstat.RunningJiffies; want != have { | ||
| t.Errorf("want RunningJiffies %v, have %v", want, have) | ||
| } | ||
| if want, have := uint64(456), schedstat.WaitingJiffies; want != have { | ||
| t.Errorf("want WaitingJiffies %v, have %v", want, have) | ||
| } | ||
| if want, have := uint64(789), schedstat.RunTimeslices; want != have { | ||
| t.Errorf("want RunTimeslices %v, have %v", want, have) | ||
| } | ||
| } | ||
|
|
||
| func TestProcSchedstatUnparsableInt(t *testing.T) { | ||
| if _, err := parseProcSchedstat("abc 456 789\n"); err == nil { | ||
| t.Error("schedstat should have been unparsable\n") | ||
| } | ||
|
|
||
| if _, err := parseProcSchedstat("123 abc 789\n"); err == nil { | ||
| t.Error("schedstat should have been unparsable\n") | ||
| } | ||
|
|
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| if _, err := parseProcSchedstat("123 456 abc\n"); err == nil { | ||
| t.Error("schedstat should have been unparsable\n") | ||
| } | ||
| } |