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Avoid array growth in FilteredList.

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The method (*schedulerCache).FilteredList builds an array of *v1.Pod
that contains every pod in the cluster except for those filtered out by
a predicate. Today, it starts with a nil slice and appends to it.

Based on current usage, FilteredList is expected to return every pod in
the cluster or omit some pods from a single node. This change reserves
array capacity equal to the total number of pods in the cluster.
This commit is contained in:
Jonathan Basseri 2017-12-19 16:18:19 -08:00
parent 8bd5a46016
commit 3909dc1341
1 changed files with 8 additions and 1 deletions
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9
plugin/pkg/scheduler/schedulercache/cache.go
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@ -104,7 +104,14 @@ func (cache *schedulerCache) List(selector labels.Selector) ([]*v1.Pod, error) {
func (cache *schedulerCache) FilteredList(podFilter PodFilter, selector labels.Selector) ([]*v1.Pod, error) {
cache.mu.Lock()
defer cache.mu.Unlock()
var pods []*v1.Pod
// podFilter is expected to return true for most or all of the pods. We
// can avoid expensive array growth without wasting too much memory by
// pre-allocating capacity.
maxSize := 0
for _, info := range cache.nodes {
maxSize += len(info.pods)
}
pods := make([]*v1.Pod, 0, maxSize)
for _, info := range cache.nodes {
for _, pod := range info.pods {
if podFilter(pod) && selector.Matches(labels.Set(pod.Labels)) {