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Ran 26 Aug 2025 02:04PM UTC

Files 615

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Committed 26 Aug 2025 01:53PM UTC coverage: 88.554% (-0.001%) from 88.555%

Job # #19961.1

Build Type

push

github

Committed by

ejona86

Commit Message

api: Reduce allocations of Attributes.Builder

Modifying existing Attributes was virtually guaranteed to allocate
within build(), just because `base` was not considered for the new map
size. Discard was also allocation-heavy because it often created a new
map. Using a regular copy-on-write approach is enough to avoid the
unnecessary allocations in both cases.

This was noticed in a profile that included xds's
AddressFilter.setPathFilter(), where Attributes.Builder.build()
allocated 6x the memory of Attributes.Builder.data().

b/435208946#comment41

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