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Merge pull request #2067 from prometheus/superq/idle_jump
Handle small backwards jumps in CPU idle
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| // Copyright 2021 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. | ||
|
|
||
| // +build !nocpu | ||
|
|
||
| package collector | ||
|
|
||
| import ( | ||
| "reflect" | ||
| "testing" | ||
|
|
||
| "github.com/go-kit/log" | ||
| "github.com/prometheus/procfs" | ||
| ) | ||
|
|
||
| func makeTestCPUCollector(s []procfs.CPUStat) *cpuCollector { | ||
| dup := make([]procfs.CPUStat, len(s)) | ||
| copy(dup, s) | ||
| return &cpuCollector{ | ||
| logger: log.NewNopLogger(), | ||
| cpuStats: dup, | ||
| } | ||
| } | ||
|
|
||
| func TestCPU(t *testing.T) { | ||
| firstCPUStat := []procfs.CPUStat{{ | ||
| User: 100.0, | ||
| Nice: 100.0, | ||
| System: 100.0, | ||
| Idle: 100.0, | ||
| Iowait: 100.0, | ||
| IRQ: 100.0, | ||
| SoftIRQ: 100.0, | ||
| Steal: 100.0, | ||
| Guest: 100.0, | ||
| GuestNice: 100.0, | ||
| }} | ||
|
|
||
| c := makeTestCPUCollector(firstCPUStat) | ||
| want := []procfs.CPUStat{{ | ||
| User: 101.0, | ||
| Nice: 101.0, | ||
| System: 101.0, | ||
| Idle: 101.0, | ||
| Iowait: 101.0, | ||
| IRQ: 101.0, | ||
| SoftIRQ: 101.0, | ||
| Steal: 101.0, | ||
| Guest: 101.0, | ||
| GuestNice: 101.0, | ||
| }} | ||
| c.updateCPUStats(want) | ||
| got := c.cpuStats | ||
| if !reflect.DeepEqual(want, got) { | ||
| t.Fatalf("should have %v CPU Stat: got %v", want, got) | ||
| } | ||
|
|
||
| c = makeTestCPUCollector(firstCPUStat) | ||
| jumpBack := []procfs.CPUStat{{ | ||
| User: 99.9, | ||
| Nice: 99.9, | ||
| System: 99.9, | ||
| Idle: 99.9, | ||
| Iowait: 99.9, | ||
| IRQ: 99.9, | ||
| SoftIRQ: 99.9, | ||
| Steal: 99.9, | ||
| Guest: 99.9, | ||
| GuestNice: 99.9, | ||
| }} | ||
| c.updateCPUStats(jumpBack) | ||
| got = c.cpuStats | ||
| if reflect.DeepEqual(jumpBack, got) { | ||
| t.Fatalf("should have %v CPU Stat: got %v", firstCPUStat, got) | ||
| } | ||
|
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| c = makeTestCPUCollector(firstCPUStat) | ||
| resetIdle := []procfs.CPUStat{{ | ||
| User: 102.0, | ||
| Nice: 102.0, | ||
| System: 102.0, | ||
| Idle: 1.0, | ||
| Iowait: 102.0, | ||
| IRQ: 102.0, | ||
| SoftIRQ: 102.0, | ||
| Steal: 102.0, | ||
| Guest: 102.0, | ||
| GuestNice: 102.0, | ||
| }} | ||
| c.updateCPUStats(resetIdle) | ||
| got = c.cpuStats | ||
| if !reflect.DeepEqual(resetIdle, got) { | ||
| t.Fatalf("should have %v CPU Stat: got %v", resetIdle, got) | ||
| } | ||
| } |