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Signed-off-by: Francesco Romani <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| /* | ||
| * 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. | ||
| * | ||
| * Copyright 2020 Red Hat, Inc. | ||
| */ | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io/ioutil" | ||
| "os" | ||
| "path/filepath" | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| flag "github.com/spf13/pflag" | ||
|
|
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| "k8s.io/kubernetes/pkg/kubelet/cm/cpuset" | ||
| ) | ||
|
|
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| func main() { | ||
| flag.Usage = func() { | ||
| fmt.Fprintf(os.Stderr, "Usage: %s [options] cpulist\n", filepath.Base(os.Args[0])) | ||
| flag.PrintDefaults() | ||
| } | ||
| var procfsRoot = flag.StringP("procfs", "P", "/proc", "procfs mount point to use.") | ||
| flag.Parse() | ||
|
|
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| args := flag.Args() | ||
| if len(args) != 1 { | ||
| flag.Usage() | ||
| os.Exit(1) | ||
| } | ||
|
|
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| isolCpus, err := cpuset.Parse(args[0]) | ||
| if err != nil { | ||
| fmt.Fprintf(os.Stderr, "error parsing %q: %v", args[0], err) | ||
| os.Exit(1) | ||
| } | ||
|
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| irqRoot := filepath.Join(*procfsRoot, "irq") | ||
| var irqViolations []int | ||
|
|
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| err = filepath.Walk(irqRoot, func(path string, info os.FileInfo, err error) error { | ||
| if err != nil { | ||
| return err | ||
| } | ||
| _, file := filepath.Split(path) | ||
| irq, convErr := strconv.Atoi(file) | ||
| if convErr != nil { | ||
| return nil // just skip not-irq-looking dirs | ||
| } | ||
|
|
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| irqCpuList, readErr := ioutil.ReadFile(filepath.Join(path, "smp_affinity_list")) | ||
| if readErr != nil { | ||
| fmt.Fprintf(os.Stderr, "error reading smp_affinity_list for IRQ %d: %v\n", irq, readErr) | ||
| return nil // keep running | ||
| } | ||
|
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| irqCpus, parseErr := cpuset.Parse(strings.TrimSpace(string(irqCpuList))) | ||
|
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| if parseErr != nil { | ||
| fmt.Fprintf(os.Stderr, "error parsing smp_affinity_list for IRQ %d: %v\n", irq, parseErr) | ||
| return nil // keep running | ||
| } | ||
|
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| cpus := irqCpus.Intersection(isolCpus) | ||
| if cpus.Size() != 0 { | ||
| fmt.Printf("IRQ %3d: can run on %v\n", irq, cpus.ToSlice()) | ||
| irqViolations = append(irqViolations, irq) | ||
| } | ||
|
|
||
| return nil | ||
| }) | ||
| } |
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