mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2025-03-16 13:28:18 +00:00
a2b9df5cd3
Extend the FeatureSource interface with new methods for configuration handling. This enables easier on-the fly reconfiguration of the feature sources. Further, it simplifies adding config support to feature sources in the future. Stub methods are added to sources that do not currently have any configurability. The patch fixes some (corner) cases with the overrides (--options) handling, too: - Overrides were not applied if config file was missing or its parsing failed - Overrides for a certain source did not have effect if an empty config for the source was specified in the config file. This was caused by the first pass of parsing (config file) setting a nil pointer to the source-specific config, effectively detaching it from the main config. The second pass would then create a new instance of the source specific config, but, this was not visible in the feature source, of course.
117 lines
2.9 KiB
Go
117 lines
2.9 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 memory
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import (
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"io/ioutil"
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"log"
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"os"
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"strings"
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"sigs.k8s.io/node-feature-discovery/source"
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)
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// Source implements FeatureSource.
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type Source struct{}
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// Name returns an identifier string for this feature source.
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func (s Source) Name() string { return "memory" }
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// NewConfig method of the FeatureSource interface
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func (s *Source) NewConfig() source.Config { return nil }
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// GetConfig method of the FeatureSource interface
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func (s *Source) GetConfig() source.Config { return nil }
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// SetConfig method of the FeatureSource interface
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func (s *Source) SetConfig(source.Config) {}
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// Discover returns feature names for memory: numa if more than one memory node is present.
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func (s Source) Discover() (source.Features, error) {
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features := source.Features{}
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// Detect NUMA
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numa, err := isNuma()
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if err != nil {
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log.Printf("ERROR: failed to detect NUMA topology: %s", err)
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} else if numa {
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features["numa"] = true
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}
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// Detect NVDIMM
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nv, err := detectNvdimm()
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if err != nil {
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log.Printf("ERROR: NVDIMM detection failed: %s", err)
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} else {
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for k, v := range nv {
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features["nv."+k] = v
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}
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}
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return features, nil
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}
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// Detect if the platform has NUMA topology
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func isNuma() (bool, error) {
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// Find out how many nodes are online
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// Multiple nodes is a sign of NUMA
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bytes, err := ioutil.ReadFile(source.SysfsDir.Path("devices/system/node/online"))
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if err != nil {
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return false, err
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}
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// File content is expected to be:
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// "0\n" in one-node case
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// "0-K\n" in N-node case where K=N-1
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// presence of newline requires TrimSpace
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if strings.TrimSpace(string(bytes)) != "0" {
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// more than one node means NUMA
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return true, nil
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}
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return false, nil
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}
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// Detect NVDIMM devices and configuration
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func detectNvdimm() (map[string]bool, error) {
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features := make(map[string]bool)
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// Check presence of physical devices
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devices, err := ioutil.ReadDir(source.SysfsDir.Path("class/nd"))
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if err == nil {
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if len(devices) > 0 {
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features["present"] = true
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}
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} else if os.IsNotExist(err) {
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return nil, nil
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} else {
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return nil, err
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}
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// Check presence of DAX-configured regions
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devices, err = ioutil.ReadDir(source.SysfsDir.Path("bus/nd/devices"))
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if err == nil {
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for _, d := range devices {
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if strings.HasPrefix(d.Name(), "dax") {
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features["dax"] = true
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}
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}
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} else {
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log.Printf("WARNING: failed to detect NVDIMM configuration: %s", err)
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}
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return features, nil
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}
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