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Add mergeFilteredHints:
- Move remaining logic from mergeProvidersHints to generic top level mergeFilteredHints function. - Add numaNodes as parameter in order to make generic. - Move single NUMA node specific check to single-numa-node Merge function.
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nolancon
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@ -93,6 +93,53 @@ func filterProvidersHints(providersHints []map[string][]TopologyHint) [][]Topolo
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return allProviderHints
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}
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func mergeFilteredHints(numaNodes []int, filteredHints [][]TopologyHint) TopologyHint {
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// Set the default affinity as an any-numa affinity containing the list
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// of NUMA Nodes available on this machine.
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defaultAffinity, _ := bitmask.NewBitMask(numaNodes...)
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// Set the bestHint to return from this function as {nil false}.
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// This will only be returned if no better hint can be found when
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// merging hints from each hint provider.
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bestHint := TopologyHint{defaultAffinity, false}
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iterateAllProviderTopologyHints(filteredHints, func(permutation []TopologyHint) {
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// Get the NUMANodeAffinity from each hint in the permutation and see if any
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// of them encode unpreferred allocations.
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mergedHint := mergePermutation(numaNodes, permutation)
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// Only consider mergedHints that result in a NUMANodeAffinity > 0 to
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// replace the current bestHint.
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if mergedHint.NUMANodeAffinity.Count() == 0 {
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return
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}
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// If the current bestHint is non-preferred and the new mergedHint is
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// preferred, always choose the preferred hint over the non-preferred one.
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if mergedHint.Preferred && !bestHint.Preferred {
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bestHint = mergedHint
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return
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}
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// If the current bestHint is preferred and the new mergedHint is
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// non-preferred, never update bestHint, regardless of mergedHint's
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// narowness.
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if !mergedHint.Preferred && bestHint.Preferred {
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return
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}
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// If mergedHint and bestHint has the same preference, only consider
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// mergedHints that have a narrower NUMANodeAffinity than the
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// NUMANodeAffinity in the current bestHint.
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if !mergedHint.NUMANodeAffinity.IsNarrowerThan(bestHint.NUMANodeAffinity) {
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return
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}
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// In all other cases, update bestHint to the current mergedHint
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bestHint = mergedHint
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})
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return bestHint
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}
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// Iterate over all permutations of hints in 'allProviderHints [][]TopologyHint'.
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//
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// This procedure is implemented as a recursive function over the set of hints
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@ -17,7 +17,6 @@ limitations under the License.
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package topologymanager
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import (
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"k8s.io/kubernetes/pkg/kubelet/cm/topologymanager/bitmask"
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"k8s.io/kubernetes/pkg/kubelet/lifecycle"
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)
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@ -48,58 +47,7 @@ func (p *bestEffortPolicy) canAdmitPodResult(hint *TopologyHint) lifecycle.PodAd
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func (p *bestEffortPolicy) Merge(providersHints []map[string][]TopologyHint) (TopologyHint, lifecycle.PodAdmitResult) {
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filteredProvidersHints := filterProvidersHints(providersHints)
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hint := p.mergeProvidersHints(filteredProvidersHints)
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admit := p.canAdmitPodResult(&hint)
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return hint, admit
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}
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// Merge the hints from all hint providers to find the best one.
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func (p *bestEffortPolicy) mergeProvidersHints(filteredHints [][]TopologyHint) TopologyHint {
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// Set the default affinity as an any-numa affinity containing the list
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// of NUMA Nodes available on this machine.
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defaultAffinity, _ := bitmask.NewBitMask(p.numaNodes...)
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// Iterate over all permutations of hints in 'allProviderHints'. Merge the
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// hints in each permutation by taking the bitwise-and of their affinity masks.
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// Return the hint with the narrowest NUMANodeAffinity of all merged
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// permutations that have at least one NUMA ID set. If no merged mask can be
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// found that has at least one NUMA ID set, return the 'defaultAffinity'.
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bestHint := TopologyHint{defaultAffinity, false}
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iterateAllProviderTopologyHints(filteredHints, func(permutation []TopologyHint) {
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// Get the NUMANodeAffinity from each hint in the permutation and see if any
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// of them encode unpreferred allocations.
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mergedHint := mergePermutation(p.numaNodes, permutation)
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// Only consider mergedHints that result in a NUMANodeAffinity > 0 to
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// replace the current bestHint.
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if mergedHint.NUMANodeAffinity.Count() == 0 {
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return
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}
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// If the current bestHint is non-preferred and the new mergedHint is
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// preferred, always choose the preferred hint over the non-preferred one.
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if mergedHint.Preferred && !bestHint.Preferred {
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bestHint = mergedHint
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return
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}
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// If the current bestHint is preferred and the new mergedHint is
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// non-preferred, never update bestHint, regardless of mergedHint's
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// narowness.
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if !mergedHint.Preferred && bestHint.Preferred {
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return
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}
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// If mergedHint and bestHint has the same preference, only consider
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// mergedHints that have a narrower NUMANodeAffinity than the
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// NUMANodeAffinity in the current bestHint.
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if !mergedHint.NUMANodeAffinity.IsNarrowerThan(bestHint.NUMANodeAffinity) {
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return
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}
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// In all other cases, update bestHint to the current mergedHint
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bestHint = mergedHint
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})
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return bestHint
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bestHint := mergeFilteredHints(p.numaNodes, filteredProvidersHints)
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admit := p.canAdmitPodResult(&bestHint)
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return bestHint, admit
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}
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@ -53,7 +53,7 @@ func (p *restrictedPolicy) canAdmitPodResult(hint *TopologyHint) lifecycle.PodAd
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func (p *restrictedPolicy) Merge(providersHints []map[string][]TopologyHint) (TopologyHint, lifecycle.PodAdmitResult) {
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filteredHints := filterProvidersHints(providersHints)
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hint := p.mergeProvidersHints(filteredHints)
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hint := mergeFilteredHints(p.numaNodes, filteredHints)
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admit := p.canAdmitPodResult(&hint)
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return hint, admit
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}
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@ -71,63 +71,17 @@ func filterSingleNumaHints(allResourcesHints [][]TopologyHint) [][]TopologyHint
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return filteredResourcesHints
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}
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func (p *singleNumaNodePolicy) mergeProvidersHints(filteredHints [][]TopologyHint) TopologyHint {
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// Set the default affinity as an any-numa affinity containing the list
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// of NUMA Nodes available on this machine.
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defaultAffinity, _ := bitmask.NewBitMask(p.numaNodes...)
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// Set the bestHint to return from this function as {nil false}.
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// This will only be returned if no better hint can be found when
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// merging hints from each hint provider.
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bestHint := TopologyHint{defaultAffinity, false}
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iterateAllProviderTopologyHints(filteredHints, func(permutation []TopologyHint) {
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// Get the NUMANodeAffinity from each hint in the permutation and see if any
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// of them encode unpreferred allocations.
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mergedHint := mergePermutation(p.numaNodes, permutation)
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// Only consider mergedHints that result in a NUMANodeAffinity > 0 to
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// replace the current bestHint.
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if mergedHint.NUMANodeAffinity.Count() == 0 {
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return
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}
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// If the current bestHint is non-preferred and the new mergedHint is
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// preferred, always choose the preferred hint over the non-preferred one.
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if mergedHint.Preferred && !bestHint.Preferred {
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bestHint = mergedHint
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return
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}
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// If the current bestHint is preferred and the new mergedHint is
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// non-preferred, never update bestHint, regardless of mergedHint's
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// narowness.
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if !mergedHint.Preferred && bestHint.Preferred {
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return
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}
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// If mergedHint and bestHint has the same preference, only consider
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// mergedHints that have a narrower NUMANodeAffinity than the
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// NUMANodeAffinity in the current bestHint.
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if !mergedHint.NUMANodeAffinity.IsNarrowerThan(bestHint.NUMANodeAffinity) {
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return
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}
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// In all other cases, update bestHint to the current mergedHint
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bestHint = mergedHint
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})
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if bestHint.NUMANodeAffinity.IsEqual(defaultAffinity) {
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bestHint = TopologyHint{nil, bestHint.Preferred}
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}
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return bestHint
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}
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func (p *singleNumaNodePolicy) Merge(providersHints []map[string][]TopologyHint) (TopologyHint, lifecycle.PodAdmitResult) {
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filteredHints := filterProvidersHints(providersHints)
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// Filter to only include don't cares and hints with a single NUMA node.
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singleNumaHints := filterSingleNumaHints(filteredHints)
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hint := p.mergeProvidersHints(singleNumaHints)
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admit := p.canAdmitPodResult(&hint)
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return hint, admit
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bestHint := mergeFilteredHints(p.numaNodes, singleNumaHints)
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defaultAffinity, _ := bitmask.NewBitMask(p.numaNodes...)
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if bestHint.NUMANodeAffinity.IsEqual(defaultAffinity) {
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bestHint = TopologyHint{nil, bestHint.Preferred}
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}
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admit := p.canAdmitPodResult(&bestHint)
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return bestHint, admit
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}
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