mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-15 17:50:49 +00:00
655f5c5555
Remove 'cpuid', 'pstate' and 'rdt' feature sources and move their
functionality under the 'cpu' source. The goal is to have a more
systematic organization of feature sources and labels. After this change
we now basically have one source per type of hw, one for kernel and one
for userspace sw.
Related feature labels are changed, correspondingly, new labels being:
feature.node.k8s.io/cpu-cpuid.<cpuid flag>
feature.node.k8s.io/cpu-pstate.turbo
feature.node.k8s.io/cpu-rdt.<rdt feature>
90 lines
3 KiB
Go
90 lines
3 KiB
Go
// +build amd64
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/*
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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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"sigs.k8s.io/node-feature-discovery/pkg/cpuid"
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)
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const (
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// CPUID EAX input values
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LEAF_EXT_FEATURE_FLAGS = 0x07
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LEAF_RDT_MONITORING = 0x0f
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LEAF_RDT_ALLOCATION = 0x10
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// CPUID ECX input values
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RDT_MONITORING_SUBLEAF_L3 = 1
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// CPUID bitmasks
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EXT_FEATURE_FLAGS_EBX_RDT_M = 1 << 12
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EXT_FEATURE_FLAGS_EBX_RDT_A = 1 << 15
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RDT_MONITORING_EDX_L3_MONITORING = 1 << 1
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RDT_MONITORING_SUBLEAF_L3_EDX_L3_OCCUPANCY_MONITORING = 1 << 0
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RDT_MONITORING_SUBLEAF_L3_EDX_L3_TOTAL_BANDWIDTH_MONITORING = 1 << 1
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RDT_MONITORING_SUBLEAF_L3_EDX_L3_LOCAL_BANDWIDTH_MONITORING = 1 << 2
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RDT_ALLOCATION_EBX_L3_CACHE_ALLOCATION = 1 << 1
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RDT_ALLOCATION_EBX_L2_CACHE_ALLOCATION = 1 << 2
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RDT_ALLOCATION_EBX_MEMORY_BANDWIDTH_ALLOCATION = 1 << 3
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)
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func discoverRDT() []string {
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features := []string{}
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// Read cpuid information
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extFeatures := cpuid.Cpuid(LEAF_EXT_FEATURE_FLAGS, 0)
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rdtMonitoring := cpuid.Cpuid(LEAF_RDT_MONITORING, 0)
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rdtL3Monitoring := cpuid.Cpuid(LEAF_RDT_MONITORING, RDT_MONITORING_SUBLEAF_L3)
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rdtAllocation := cpuid.Cpuid(LEAF_RDT_ALLOCATION, 0)
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// Detect RDT monitoring capabilities
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if extFeatures.EBX&EXT_FEATURE_FLAGS_EBX_RDT_M != 0 {
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if rdtMonitoring.EDX&RDT_MONITORING_EDX_L3_MONITORING != 0 {
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// Monitoring is supported
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features = append(features, "RDTMON")
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// Cache Monitoring Technology (L3 occupancy monitoring)
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if rdtL3Monitoring.EDX&RDT_MONITORING_SUBLEAF_L3_EDX_L3_OCCUPANCY_MONITORING != 0 {
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features = append(features, "RDTCMT")
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}
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// Memore Bandwidth Monitoring (L3 local&total bandwidth monitoring)
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if rdtL3Monitoring.EDX&RDT_MONITORING_SUBLEAF_L3_EDX_L3_TOTAL_BANDWIDTH_MONITORING != 0 &&
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rdtL3Monitoring.EDX&RDT_MONITORING_SUBLEAF_L3_EDX_L3_LOCAL_BANDWIDTH_MONITORING != 0 {
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features = append(features, "RDTMBM")
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}
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}
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}
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// Detect RDT allocation capabilities
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if extFeatures.EBX&EXT_FEATURE_FLAGS_EBX_RDT_A != 0 {
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// L3 Cache Allocation
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if rdtAllocation.EBX&RDT_ALLOCATION_EBX_L3_CACHE_ALLOCATION != 0 {
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features = append(features, "RDTL3CA")
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}
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// L2 Cache Allocation
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if rdtAllocation.EBX&RDT_ALLOCATION_EBX_L2_CACHE_ALLOCATION != 0 {
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features = append(features, "RDTL2CA")
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}
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// Memory Bandwidth Allocation
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if rdtAllocation.EBX&RDT_ALLOCATION_EBX_MEMORY_BANDWIDTH_ALLOCATION != 0 {
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features = append(features, "RDTMBA")
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}
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}
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return features
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}
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