v4.16 

apiVersion: performance.openshift.io/v2
kind: PerformanceProfile
metadata:
  annotations:
    kubeletconfig.experimental: |
      { "shutdownGracePeriod":"30s",
        "shutdownGracePeriodCriticalPods":"10s",
        "allowedUnsafeSysctls":[
          "net.ipv6.conf.default.autoconf",
          "net.ipv6.conf.default.accept_ra",
          "net.ipv6.conf.all.forwarding",
          "net.ipv4.conf.all.forwarding"
        ]
      }
  name: perf-sno
spec:
  cpu:
    balanceIsolated: true
    isolated: 2-3
    reserved: 0-1
  hugepages:
    defaultHugepagesSize: 1G
    pages:
    - count: 1
      node: 0
      size: 1G
  machineConfigPoolSelector:
    pools.operator.machineconfiguration.openshift.io/worker: ""
  nodeSelector:
    node-role.kubernetes.io/worker: ""

[quickcluster@upi-0 ~]$ oc get kubeletconfig performance-perf-sno -o yaml
apiVersion: machineconfiguration.openshift.io/v1
kind: KubeletConfig
metadata:
  annotations:
    machineconfiguration.openshift.io/mc-name-suffix: ""
  creationTimestamp: "2024-09-11T09:55:38Z"
  finalizers:
  - 99-worker-generated-kubelet
  generation: 1
  name: performance-perf-sno
  ownerReferences:
  - apiVersion: performance.openshift.io/v2
    blockOwnerDeletion: true
    controller: true
    kind: PerformanceProfile
    name: perf-sno
    uid: f04d20c0-2a9c-4e21-b353-fe6ab9568a3f
  resourceVersion: "369603"
  uid: 6ffdf5ac-0a4c-4f32-b9cd-8e3bf6758e09
spec:
  kubeletConfig:
    allowedUnsafeSysctls:
    - net.ipv6.conf.default.autoconf
    - net.ipv6.conf.default.accept_ra
    - net.ipv6.conf.all.forwarding
    - net.ipv4.conf.all.forwarding
    apiVersion: kubelet.config.k8s.io/v1beta1
    authentication:
      anonymous: {}
      webhook:
        cacheTTL: 0s
      x509: {}
    authorization:
      webhook:
        cacheAuthorizedTTL: 0s
        cacheUnauthorizedTTL: 0s
    containerRuntimeEndpoint: ""
    cpuManagerPolicy: static
    cpuManagerReconcilePeriod: 5s
    evictionHard:
      imagefs.available: 15%
      memory.available: 100Mi
      nodefs.available: 10%
      nodefs.inodesFree: 5%
    evictionPressureTransitionPeriod: 0s
    fileCheckFrequency: 0s
    httpCheckFrequency: 0s
    imageMaximumGCAge: 0s
    imageMinimumGCAge: 0s
    kind: KubeletConfiguration
    kubeReserved:
      memory: 500Mi 
    logging:
      flushFrequency: 0
      options:
        json:
          infoBufferSize: "0"
      verbosity: 0
    memorySwap: {}
    nodeStatusReportFrequency: 0s
    nodeStatusUpdateFrequency: 0s
    reservedSystemCPUs: 0-1
    runtimeRequestTimeout: 0s
    shutdownGracePeriod: 30s
    shutdownGracePeriodCriticalPods: 10s
    streamingConnectionIdleTimeout: 0s
    syncFrequency: 0s
    systemReserved:
      memory: 500Mi 
    topologyManagerPolicy: best-effort
    volumeStatsAggPeriod: 0s
  machineConfigPoolSelector:
    matchLabels:
      pools.operator.machineconfiguration.openshift.io/worker: ""
status:
  conditions:
  - lastTransitionTime: "2024-09-11T09:55:38Z"
    message: Success
    status: "True"
    type: Success

Resultant kubeletconfig after applying a performanceprofile has unwanted systemReserved memory value of 500Mi

Applying a performance profile doesn't change systemReserved memory