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integ
Code Issues Proposed changes
integ/kubernetes/kubernetes-1.25.3/debian/deb_folder/patches/kubelet-cpumanager-keep-nor...

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From a793b871526189690d624379ce4e4e9ec834ccf6 Mon Sep 17 00:00:00 2001
From: Ramesh Kumar Sivanandam <rameshkumar.sivanandam@windriver.com>
Date: Mon, 7 Nov 2022 08:43:43 -0500
Subject: [PATCH] kubelet cpumanager keep normal containers off reserved CPUs
When starting the kubelet process, two separate sets of reserved CPUs
may be specified. With this change CPUs reserved via
'--system-reserved=cpu'
or '--kube-reserved=cpu' will be ignored by kubernetes itself. A small
tweak to the default CPU affinity ensures that "normal" Kubernetes
pods won't run on the reserved CPUs.
Co-authored-by: Jim Gauld <james.gauld@windriver.com>
Signed-off-by: Sachin Gopala Krishna <saching.krishna@windriver.com>
Signed-off-by: Ramesh Kumar Sivanandam <rameshkumar.sivanandam@windriver.com>
---
pkg/kubelet/cm/cpumanager/cpu_manager.go | 6 ++-
pkg/kubelet/cm/cpumanager/cpu_manager_test.go | 15 ++++++--
pkg/kubelet/cm/cpumanager/policy_static.go | 30 ++++++++++++---
.../cm/cpumanager/policy_static_test.go | 38 ++++++++++++++-----
4 files changed, 68 insertions(+), 21 deletions(-)
diff --git a/pkg/kubelet/cm/cpumanager/cpu_manager.go b/pkg/kubelet/cm/cpumanager/cpu_manager.go
index 32eabc1340e..00c034bc753 100644
--- a/pkg/kubelet/cm/cpumanager/cpu_manager.go
+++ b/pkg/kubelet/cm/cpumanager/cpu_manager.go
@@ -191,7 +191,11 @@ func NewManager(cpuPolicyName string, cpuPolicyOptions map[string]string, reconc
// exclusively allocated.
reservedCPUsFloat := float64(reservedCPUs.MilliValue()) / 1000
numReservedCPUs := int(math.Ceil(reservedCPUsFloat))
- policy, err = NewStaticPolicy(topo, numReservedCPUs, specificCPUs, affinity, cpuPolicyOptions)
+ // NOTE: Set excludeReserved unconditionally to exclude reserved CPUs from default cpuset.
+ // This variable is primarily to make testing easier.
+ excludeReserved := true
+ policy, err = NewStaticPolicy(topo, numReservedCPUs, specificCPUs, affinity, cpuPolicyOptions, excludeReserved)
+
if err != nil {
return nil, fmt.Errorf("new static policy error: %w", err)
}
diff --git a/pkg/kubelet/cm/cpumanager/cpu_manager_test.go b/pkg/kubelet/cm/cpumanager/cpu_manager_test.go
index 834d099ac3e..d553b182e0b 100644
--- a/pkg/kubelet/cm/cpumanager/cpu_manager_test.go
+++ b/pkg/kubelet/cm/cpumanager/cpu_manager_test.go
@@ -215,6 +215,7 @@ func makeMultiContainerPod(initCPUs, appCPUs []struct{ request, limit string })
}
func TestCPUManagerAdd(t *testing.T) {
+ testExcl := false
testPolicy, _ := NewStaticPolicy(
&topology.CPUTopology{
NumCPUs: 4,
@@ -230,7 +231,8 @@ func TestCPUManagerAdd(t *testing.T) {
0,
cpuset.NewCPUSet(),
topologymanager.NewFakeManager(),
- nil)
+ nil,
+ testExcl)
testCases := []struct {
description string
updateErr error
@@ -479,8 +481,9 @@ func TestCPUManagerAddWithInitContainers(t *testing.T) {
},
}
+ testExcl := false
for _, testCase := range testCases {
- policy, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil)
+ policy, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil, testExcl)
mockState := &mockState{
assignments: testCase.stAssignments,
@@ -705,6 +708,7 @@ func TestCPUManagerRemove(t *testing.T) {
}
func TestReconcileState(t *testing.T) {
+ testExcl := false
testPolicy, _ := NewStaticPolicy(
&topology.CPUTopology{
NumCPUs: 8,
@@ -724,7 +728,8 @@ func TestReconcileState(t *testing.T) {
0,
cpuset.NewCPUSet(),
topologymanager.NewFakeManager(),
- nil)
+ nil,
+ testExcl)
testCases := []struct {
description string
@@ -1228,6 +1233,7 @@ func TestReconcileState(t *testing.T) {
// above test cases are without kubelet --reserved-cpus cmd option
// the following tests are with --reserved-cpus configured
func TestCPUManagerAddWithResvList(t *testing.T) {
+ testExcl := false
testPolicy, _ := NewStaticPolicy(
&topology.CPUTopology{
NumCPUs: 4,
@@ -1243,7 +1249,8 @@ func TestCPUManagerAddWithResvList(t *testing.T) {
1,
cpuset.NewCPUSet(0),
topologymanager.NewFakeManager(),
- nil)
+ nil,
+ testExcl)
testCases := []struct {
description string
updateErr error
diff --git a/pkg/kubelet/cm/cpumanager/policy_static.go b/pkg/kubelet/cm/cpumanager/policy_static.go
index ff9e6a20e14..14a6e7af9be 100644
--- a/pkg/kubelet/cm/cpumanager/policy_static.go
+++ b/pkg/kubelet/cm/cpumanager/policy_static.go
@@ -96,6 +96,8 @@ type staticPolicy struct {
topology *topology.CPUTopology
// set of CPUs that is not available for exclusive assignment
reserved cpuset.CPUSet
+ // If true, default CPUSet should exclude reserved CPUs
+ excludeReserved bool
// topology manager reference to get container Topology affinity
affinity topologymanager.Store
// set of CPUs to reuse across allocations in a pod
@@ -110,7 +112,7 @@ var _ Policy = &staticPolicy{}
// NewStaticPolicy returns a CPU manager policy that does not change CPU
// assignments for exclusively pinned guaranteed containers after the main
// container process starts.
-func NewStaticPolicy(topology *topology.CPUTopology, numReservedCPUs int, reservedCPUs cpuset.CPUSet, affinity topologymanager.Store, cpuPolicyOptions map[string]string) (Policy, error) {
+func NewStaticPolicy(topology *topology.CPUTopology, numReservedCPUs int, reservedCPUs cpuset.CPUSet, affinity topologymanager.Store, cpuPolicyOptions map[string]string, excludeReserved bool) (Policy, error) {
opts, err := NewStaticPolicyOptions(cpuPolicyOptions)
if err != nil {
return nil, err
@@ -125,6 +127,7 @@ func NewStaticPolicy(topology *topology.CPUTopology, numReservedCPUs int, reserv
policy := &staticPolicy{
topology: topology,
affinity: affinity,
+ excludeReserved: excludeReserved,
cpusToReuse: make(map[string]cpuset.CPUSet),
options: opts,
}
@@ -176,7 +179,15 @@ func (p *staticPolicy) validateState(s state.State) error {
}
// state is empty initialize
allCPUs := p.topology.CPUDetails.CPUs()
- s.SetDefaultCPUSet(allCPUs)
+ if p.excludeReserved {
+ // Exclude reserved CPUs from the default CPUSet to keep containers off them
+ // unless explicitly affined.
+ s.SetDefaultCPUSet(allCPUs.Difference(p.reserved))
+ } else {
+ s.SetDefaultCPUSet(allCPUs)
+ }
+ klog.Infof("[cpumanager] static policy: CPUSet: allCPUs:%v, reserved:%v, default:%v\n",
+ allCPUs, p.reserved, s.GetDefaultCPUSet())
return nil
}
@@ -184,11 +195,12 @@ func (p *staticPolicy) validateState(s state.State) error {
// 1. Check if the reserved cpuset is not part of default cpuset because:
// - kube/system reserved have changed (increased) - may lead to some containers not being able to start
// - user tampered with file
- if !p.reserved.Intersection(tmpDefaultCPUset).Equals(p.reserved) {
- return fmt.Errorf("not all reserved cpus: \"%s\" are present in defaultCpuSet: \"%s\"",
- p.reserved.String(), tmpDefaultCPUset.String())
+ if !p.excludeReserved {
+ if !p.reserved.Intersection(tmpDefaultCPUset).Equals(p.reserved) {
+ return fmt.Errorf("not all reserved cpus: \"%s\" are present in defaultCpuSet: \"%s\"",
+ p.reserved.String(), tmpDefaultCPUset.String())
+ }
}
-
// 2. Check if state for static policy is consistent
for pod := range tmpAssignments {
for container, cset := range tmpAssignments[pod] {
@@ -215,6 +227,9 @@ func (p *staticPolicy) validateState(s state.State) error {
}
}
totalKnownCPUs = totalKnownCPUs.UnionAll(tmpCPUSets)
+ if p.excludeReserved {
+ totalKnownCPUs = totalKnownCPUs.Union(p.reserved)
+ }
if !totalKnownCPUs.Equals(p.topology.CPUDetails.CPUs()) {
return fmt.Errorf("current set of available CPUs \"%s\" doesn't match with CPUs in state \"%s\"",
p.topology.CPUDetails.CPUs().String(), totalKnownCPUs.String())
@@ -314,6 +329,9 @@ func (p *staticPolicy) RemoveContainer(s state.State, podUID string, containerNa
cpusInUse := getAssignedCPUsOfSiblings(s, podUID, containerName)
if toRelease, ok := s.GetCPUSet(podUID, containerName); ok {
s.Delete(podUID, containerName)
+ if p.excludeReserved {
+ toRelease = toRelease.Difference(p.reserved)
+ }
// Mutate the shared pool, adding released cpus.
toRelease = toRelease.Difference(cpusInUse)
s.SetDefaultCPUSet(s.GetDefaultCPUSet().Union(toRelease))
diff --git a/pkg/kubelet/cm/cpumanager/policy_static_test.go b/pkg/kubelet/cm/cpumanager/policy_static_test.go
index 4c10af065a4..80a0c5a9e70 100644
--- a/pkg/kubelet/cm/cpumanager/policy_static_test.go
+++ b/pkg/kubelet/cm/cpumanager/policy_static_test.go
@@ -36,6 +36,7 @@ type staticPolicyTest struct {
description string
topo *topology.CPUTopology
numReservedCPUs int
+ excludeReserved bool
podUID string
options map[string]string
containerName string
@@ -68,7 +69,8 @@ func (spt staticPolicyTest) PseudoClone() staticPolicyTest {
}
func TestStaticPolicyName(t *testing.T) {
- policy, _ := NewStaticPolicy(topoSingleSocketHT, 1, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil)
+ testExcl := false
+ policy, _ := NewStaticPolicy(topoSingleSocketHT, 1, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil, testExcl)
policyName := policy.Name()
if policyName != "static" {
@@ -98,6 +100,15 @@ func TestStaticPolicyStart(t *testing.T) {
stDefaultCPUSet: cpuset.NewCPUSet(),
expCSet: cpuset.NewCPUSet(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11),
},
+ {
+ description: "empty cpuset exclude reserved",
+ topo: topoDualSocketHT,
+ numReservedCPUs: 2,
+ excludeReserved: true,
+ stAssignments: state.ContainerCPUAssignments{},
+ stDefaultCPUSet: cpuset.NewCPUSet(),
+ expCSet: cpuset.NewCPUSet(1, 2, 3, 4, 5, 7, 8, 9, 10, 11),
+ },
{
description: "reserved cores 0 & 6 are not present in available cpuset",
topo: topoDualSocketHT,
@@ -144,7 +155,8 @@ func TestStaticPolicyStart(t *testing.T) {
}
for _, testCase := range testCases {
t.Run(testCase.description, func(t *testing.T) {
- p, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil)
+ p, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil, testCase.excludeReserved)
+
policy := p.(*staticPolicy)
st := &mockState{
assignments: testCase.stAssignments,
@@ -565,7 +577,8 @@ func runStaticPolicyTestCase(t *testing.T, testCase staticPolicyTest) {
if testCase.topologyHint != nil {
tm = topologymanager.NewFakeManagerWithHint(testCase.topologyHint)
}
- policy, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, cpuset.NewCPUSet(), tm, testCase.options)
+ testExcl := false
+ policy, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, cpuset.NewCPUSet(), tm, testCase.options, testExcl)
st := &mockState{
assignments: testCase.stAssignments,
@@ -636,7 +649,7 @@ func TestStaticPolicyReuseCPUs(t *testing.T) {
}
for _, testCase := range testCases {
- policy, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil)
+ policy, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil, testCase.excludeReserved)
st := &mockState{
assignments: testCase.stAssignments,
@@ -668,6 +681,7 @@ func TestStaticPolicyReuseCPUs(t *testing.T) {
}
func TestStaticPolicyRemove(t *testing.T) {
+ excludeReserved := false
testCases := []staticPolicyTest{
{
description: "SingleSocketHT, DeAllocOneContainer",
@@ -726,7 +740,7 @@ func TestStaticPolicyRemove(t *testing.T) {
}
for _, testCase := range testCases {
- policy, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil)
+ policy, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil, excludeReserved)
st := &mockState{
assignments: testCase.stAssignments,
@@ -748,6 +762,7 @@ func TestStaticPolicyRemove(t *testing.T) {
}
func TestTopologyAwareAllocateCPUs(t *testing.T) {
+ excludeReserved := false
testCases := []struct {
description string
topo *topology.CPUTopology
@@ -816,7 +831,7 @@ func TestTopologyAwareAllocateCPUs(t *testing.T) {
},
}
for _, tc := range testCases {
- p, _ := NewStaticPolicy(tc.topo, 0, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil)
+ p, _ := NewStaticPolicy(tc.topo, 0, cpuset.NewCPUSet(), topologymanager.NewFakeManager(), nil, excludeReserved)
policy := p.(*staticPolicy)
st := &mockState{
assignments: tc.stAssignments,
@@ -888,9 +903,11 @@ func TestStaticPolicyStartWithResvList(t *testing.T) {
expNewErr: fmt.Errorf("[cpumanager] unable to reserve the required amount of CPUs (size of 0-1 did not equal 1)"),
},
}
+ testExcl := false
for _, testCase := range testCases {
t.Run(testCase.description, func(t *testing.T) {
- p, err := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, testCase.reserved, topologymanager.NewFakeManager(), nil)
+ p, err := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, testCase.reserved, topologymanager.NewFakeManager(), nil, testExcl)
+
if !reflect.DeepEqual(err, testCase.expNewErr) {
t.Errorf("StaticPolicy Start() error (%v). expected error: %v but got: %v",
testCase.description, testCase.expNewErr, err)
@@ -930,7 +947,7 @@ func TestStaticPolicyAddWithResvList(t *testing.T) {
numReservedCPUs: 1,
reserved: cpuset.NewCPUSet(0),
stAssignments: state.ContainerCPUAssignments{},
- stDefaultCPUSet: cpuset.NewCPUSet(0, 1, 2, 3, 4, 5, 6, 7),
+ stDefaultCPUSet: cpuset.NewCPUSet(1, 2, 3, 4, 5, 6, 7),
pod: makePod("fakePod", "fakeContainer2", "8000m", "8000m"),
expErr: fmt.Errorf("not enough cpus available to satisfy request"),
expCPUAlloc: false,
@@ -942,7 +959,7 @@ func TestStaticPolicyAddWithResvList(t *testing.T) {
numReservedCPUs: 2,
reserved: cpuset.NewCPUSet(0, 1),
stAssignments: state.ContainerCPUAssignments{},
- stDefaultCPUSet: cpuset.NewCPUSet(0, 1, 2, 3, 4, 5, 6, 7),
+ stDefaultCPUSet: cpuset.NewCPUSet(2, 3, 4, 5, 6, 7),
pod: makePod("fakePod", "fakeContainer2", "1000m", "1000m"),
expErr: nil,
expCPUAlloc: true,
@@ -966,8 +983,9 @@ func TestStaticPolicyAddWithResvList(t *testing.T) {
},
}
+ testExcl := true
for _, testCase := range testCases {
- policy, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, testCase.reserved, topologymanager.NewFakeManager(), nil)
+ policy, _ := NewStaticPolicy(testCase.topo, testCase.numReservedCPUs, testCase.reserved, topologymanager.NewFakeManager(), nil, testExcl)
st := &mockState{
assignments: testCase.stAssignments,
--
2.25.1
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