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runtime/pprof: add labelMap preallocate

This commit is contained in:
Sasha Melentyev 2022-09-03 21:50:24 +03:00
parent 2392b7061c
commit 89949bc6ee
1 changed files with 1 additions and 1 deletions
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2
src/runtime/pprof/label.go
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@ -57,8 +57,8 @@ func (l *labelMap) String() string {
// WithLabels returns a new context.Context with the given labels added.
// A label overwrites a prior label with the same key.
func WithLabels(ctx context.Context, labels LabelSet) context.Context {
childLabels := make(labelMap)
parentLabels := labelValue(ctx)
childLabels := make(labelMap, len(parentLabels))
// TODO(matloob): replace the map implementation with something
// more efficient so creating a child context WithLabels doesn't need
// to clone the map.