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Scrape CPU latency stats from /proc/schedstat (#1389)
These are useful as a direct indication of CPU contention and task scheduler latency. Handy references: - https://github.com/torvalds/linux/blob/master/Documentation/scheduler/sched-stats.txt - https://doc.opensuse.org/documentation/leap/tuning/html/book.sle.tuning/cha.tuning.taskscheduler.html procfs is updated to pull in the enabling change: prometheus/procfs#186 Signed-off-by: Phil Frost <phil@postmates.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| version 15 | ||
| timestamp 15819019232 | ||
| cpu0 498494191 0 3533438552 2553969831 3853684107 2465731542 2045936778163039 343796328169361 4767485306 | ||
| domain0 00000000,00000003 212499247 210112015 1861015 1860405436 536440 369895 32599 210079416 25368550 24241256 384652 927363878 807233 6366 1647 24239609 2122447165 1886868564 121112060 2848625533 125678146 241025 1032026 1885836538 2545 12 2533 0 0 0 0 0 0 1387952561 21076581 0 | ||
| cpu1 518377256 0 4155211005 2778589869 10466382 2867629021 1904686152592476 364107263788241 5145567945 | ||
| domain0 00000000,00000003 217653037 215526982 1577949 1580427380 557469 393576 28538 215498444 28721913 27662819 371153 870843407 745912 5523 1639 27661180 2331056874 2107732788 111442342 652402556 123615235 196159 1045245 2106687543 2400 3 2397 0 0 0 0 0 0 1437804657 26220076 0 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // 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 collector | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/procfs" | ||
| ) | ||
|
|
||
| var ( | ||
| runningSecondsTotal = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, "schedstat", "running_seconds_total"), | ||
| "Number of seconds CPU spent running a process.", | ||
| []string{"cpu"}, | ||
| nil, | ||
| ) | ||
|
|
||
| waitingSecondsTotal = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, "schedstat", "waiting_seconds_total"), | ||
| "Number of seconds spent by processing waiting for this CPU.", | ||
| []string{"cpu"}, | ||
| nil, | ||
| ) | ||
|
|
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| timeslicesTotal = prometheus.NewDesc( | ||
| prometheus.BuildFQName(namespace, "schedstat", "timeslices_total"), | ||
| "Number of timeslices executed by CPU.", | ||
| []string{"cpu"}, | ||
| nil, | ||
| ) | ||
| ) | ||
|
|
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| // NewSchedstatCollector returns a new Collector exposing task scheduler statistics | ||
| func NewSchedstatCollector() (Collector, error) { | ||
| fs, err := procfs.NewFS(*procPath) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to open procfs: %v", err) | ||
| } | ||
|
|
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| return &schedstatCollector{fs: fs}, nil | ||
| } | ||
|
|
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| type schedstatCollector struct { | ||
| fs procfs.FS | ||
| } | ||
|
|
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| func init() { | ||
| registerCollector("schedstat", defaultEnabled, NewSchedstatCollector) | ||
| } | ||
|
|
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| func (c *schedstatCollector) Update(ch chan<- prometheus.Metric) error { | ||
| stats, err := c.fs.Schedstat() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
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| for _, cpu := range stats.CPUs { | ||
| ch <- prometheus.MustNewConstMetric( | ||
| runningSecondsTotal, | ||
| prometheus.CounterValue, | ||
| cpu.RunningSeconds(), | ||
| cpu.CPUNum, | ||
| ) | ||
|
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| ch <- prometheus.MustNewConstMetric( | ||
| waitingSecondsTotal, | ||
| prometheus.CounterValue, | ||
| cpu.WaitingSeconds(), | ||
| cpu.CPUNum, | ||
| ) | ||
|
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| ch <- prometheus.MustNewConstMetric( | ||
| timeslicesTotal, | ||
| prometheus.CounterValue, | ||
| float64(cpu.RunTimeslices), | ||
| cpu.CPUNum, | ||
| ) | ||
| } | ||
|
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||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -30,6 +30,7 @@ enabled_collectors=$(cat << COLLECTORS | |
| nfsd | ||
| pressure | ||
| qdisc | ||
| schedstat | ||
| sockstat | ||
| stat | ||
| textfile | ||
|
|
||
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