mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-16 13:28:18 +00:00
a65f73e834
This adds additional cpu features: - pstate status from status of intel_pstate driver - pstate scaling settings from scaling_governor - cstate enable from max_cstates in intel_idle driver
107 lines
3.2 KiB
Go
107 lines
3.2 KiB
Go
/*
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Copyright 2017 The Kubernetes 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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package cpu
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import (
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"fmt"
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"io/ioutil"
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"runtime"
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"strings"
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"k8s.io/klog/v2"
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"sigs.k8s.io/node-feature-discovery/source"
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)
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// Discover p-state related features such as turbo boost.
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func detectPstate() (map[string]string, error) {
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// On other platforms, the frequency boost mechanism is software-based.
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// So skip pstate detection on other architectures.
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if runtime.GOARCH != "amd64" && runtime.GOARCH != "386" {
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return nil, nil
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}
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// Get global pstate status
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data, err := ioutil.ReadFile(source.SysfsDir.Path("devices/system/cpu/intel_pstate/status"))
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if err != nil {
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return nil, fmt.Errorf("could not read pstate status: %s", err.Error())
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}
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status := strings.TrimSpace(string(data))
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if status == "off" {
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// No need to check other pstate features
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klog.Infof("intel_pstate driver is not in use")
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return nil, nil
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}
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features := map[string]string{"status": status}
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// Check turbo boost
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bytes, err := ioutil.ReadFile(source.SysfsDir.Path("devices/system/cpu/intel_pstate/no_turbo"))
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if err != nil {
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klog.Errorf("can't detect whether turbo boost is enabled: %s", err.Error())
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} else {
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features["turbo"] = "false"
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if bytes[0] == byte('0') {
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features["turbo"] = "true"
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}
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}
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if status != "active" {
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// Don't check other features which depend on active state
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return features, nil
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}
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// Determine scaling governor that is being used
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policies, err := ioutil.ReadDir(source.SysfsDir.Path("devices/system/cpu/cpufreq"))
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if err != nil {
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klog.Errorf("failed to read cpufreq directory: %s", err.Error())
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return features, nil
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}
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scaling := ""
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for _, policy := range policies {
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// Ensure at least one cpu is using this policy
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cpus, err := ioutil.ReadFile(source.SysfsDir.Path("devices/system/cpu/cpufreq", policy.Name(), "affected_cpus"))
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if err != nil {
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klog.Errorf("could not read cpufreq policy %s affected_cpus", policy.Name())
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continue
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}
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if strings.TrimSpace(string(cpus)) == "" {
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klog.Infof("policy %s has no associated cpus", policy.Name())
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continue
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}
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data, err := ioutil.ReadFile(source.SysfsDir.Path("devices/system/cpu/cpufreq", policy.Name(), "scaling_governor"))
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if err != nil {
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klog.Errorf("could not read cpufreq policy %s scaling_governor", policy.Name())
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continue
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}
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policy_scaling := strings.TrimSpace(string(data))
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// Check that all of the policies have the same scaling governor, if not don't set feature
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if scaling != "" && scaling != policy_scaling {
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klog.Infof("scaling_governor for policy %s doesn't match prior policy", policy.Name())
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scaling = ""
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break
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}
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scaling = policy_scaling
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}
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if scaling != "" {
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features["scaling_governor"] = scaling
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}
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return features, nil
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}
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