mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-14 11:57:51 +00:00
189 lines
3.9 KiB
Go
189 lines
3.9 KiB
Go
/*
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Copyright 2018 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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"io/ioutil"
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"log"
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"path"
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"sigs.k8s.io/node-feature-discovery/source"
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)
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const (
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cpuDevicesBaseDir = "/sys/bus/cpu/devices"
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)
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// Configuration file options
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type cpuidConfig struct {
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AttributeBlacklist []string `json:"attributeBlacklist,omitempty"`
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AttributeWhitelist []string `json:"attributeWhitelist,omitempty"`
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}
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// NFDConfig is the type holding configuration of the cpuid feature source
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type NFDConfig struct {
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Cpuid cpuidConfig `json:"cpuid,omitempty"`
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}
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// Config contains the configuration of the cpuid source
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var Config = NFDConfig{
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cpuidConfig{
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AttributeBlacklist: []string{
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"BMI1",
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"BMI2",
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"CLMUL",
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"CMOV",
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"CX16",
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"ERMS",
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"F16C",
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"HTT",
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"LZCNT",
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"MMX",
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"MMXEXT",
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"NX",
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"POPCNT",
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"RDRAND",
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"RDSEED",
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"RDTSCP",
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"SGX",
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"SGXLC",
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"SSE",
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"SSE2",
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"SSE3",
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"SSE4.1",
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"SSE4.2",
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"SSSE3",
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},
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AttributeWhitelist: []string{},
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},
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}
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// Filter for cpuid labels
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type keyFilter struct {
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keys map[string]struct{}
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whitelist bool
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}
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var cpuidFilter *keyFilter
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// Implement FeatureSource interface
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type Source struct{}
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func (s Source) Name() string { return "cpu" }
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func (s Source) Discover() (source.Features, error) {
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features := source.Features{}
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if cpuidFilter == nil {
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initCpuidFilter()
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}
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// Check if hyper-threading seems to be enabled
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found, err := haveThreadSiblings()
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if err != nil {
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log.Printf("ERROR: failed to detect hyper-threading: %v", err)
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} else if found {
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features["hardware_multithreading"] = true
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}
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// Check SST-BF
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found, err = discoverSSTBF()
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if err != nil {
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log.Printf("ERROR: failed to detect SST-BF: %v", err)
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} else if found {
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features["power.sst_bf.enabled"] = true
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}
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// Detect CPUID
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cpuidFlags := getCpuidFlags()
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for _, f := range cpuidFlags {
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if cpuidFilter.unmask(f) {
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features["cpuid."+f] = true
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}
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}
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// Detect pstate features
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pstate, err := detectPstate()
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if err != nil {
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log.Printf("ERROR: %v", err)
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} else {
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for k, v := range pstate {
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features["pstate."+k] = v
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}
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}
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// Detect RDT features
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rdt := discoverRDT()
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for _, f := range rdt {
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features["rdt."+f] = true
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}
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return features, nil
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}
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// Check if any (online) CPUs have thread siblings
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func haveThreadSiblings() (bool, error) {
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files, err := ioutil.ReadDir(cpuDevicesBaseDir)
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if err != nil {
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return false, err
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}
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for _, file := range files {
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// Try to read siblings from topology
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siblings, err := ioutil.ReadFile(path.Join(cpuDevicesBaseDir, file.Name(), "topology/thread_siblings_list"))
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if err != nil {
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return false, err
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}
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for _, char := range siblings {
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// If list separator found, we determine that there are multiple siblings
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if char == ',' || char == '-' {
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return true, nil
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}
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}
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}
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// No siblings were found
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return false, nil
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}
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func initCpuidFilter() {
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newFilter := keyFilter{keys: map[string]struct{}{}}
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if len(Config.Cpuid.AttributeWhitelist) > 0 {
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for _, k := range Config.Cpuid.AttributeWhitelist {
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newFilter.keys[k] = struct{}{}
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}
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newFilter.whitelist = true
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} else {
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for _, k := range Config.Cpuid.AttributeBlacklist {
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newFilter.keys[k] = struct{}{}
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}
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newFilter.whitelist = false
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}
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cpuidFilter = &newFilter
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}
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func (f keyFilter) unmask(k string) bool {
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if f.whitelist {
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if _, ok := f.keys[k]; ok {
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return true
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}
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} else {
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if _, ok := f.keys[k]; !ok {
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return true
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}
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}
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return false
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}
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