mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
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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
51 lines
1.6 KiB
Go
51 lines
1.6 KiB
Go
/*
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Copyright 2021 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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"strconv"
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"strings"
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"sigs.k8s.io/node-feature-discovery/source"
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)
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// Discover if c-states are enabled
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func detectCstate() (bool, error) {
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// When the intel_idle driver is in use (default), check setting of max_cstates
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driver, err := ioutil.ReadFile(source.SysfsDir.Path("devices/system/cpu/cpuidle/current_driver"))
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if err != nil {
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return false, fmt.Errorf("cannot get driver for cpuidle: %s", err.Error())
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}
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if strings.TrimSpace(string(driver)) != "intel_idle" {
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// Currently only checking intel_idle driver for cstates
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return false, fmt.Errorf("intel_idle driver is not in use: %s", string(driver))
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}
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data, err := ioutil.ReadFile(source.SysfsDir.Path("module/intel_idle/parameters/max_cstate"))
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if err != nil {
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return false, fmt.Errorf("cannot determine cstate from max_cstates: %s", err.Error())
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}
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cstates, err := strconv.Atoi(strings.TrimSpace(string(data)))
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if err != nil {
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return false, fmt.Errorf("non-integer value of cstates: %s", err.Error())
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}
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return cstates > 0, nil
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}
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