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Store known span tags densely, behind an experimental flag (phase 3b - dense tag storage) - #12856

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dougqh/tag-registry-direction-resolutionfrom

dougqh/dense-store-v3

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Store known span tags densely, behind an experimental flag (phase 3b - dense tag storage)#12856
dougqh wants to merge 32 commits into
dougqh/tag-registry-direction-resolutionfrom
dougqh/dense-store-v3

Commits on Oct 10, 2026
- Color known tags into dense-store slots in the tag registry
  
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- Add trace.experimental.dense.tags.enabled (default off)
  
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- Store slotted known tags densely in TagMap, behind a flag
  
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- Test and benchmark the dense tag store
  
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- Store dense tags without building an Entry for the replaced value
  
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- Route the core's trusted id writes to the dense store
  
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- Store every known tag densely, and give every modeled tag a slot
  
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- Give a shared tag name's undirected form its own id
  
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Commits on Oct 11, 2026
- Grow the dense tag arrays once, to the hard bound
  
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- Split TagMap into hash-only and dense implementations
  
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- Move the dense tag store into DenseTagMap
  
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- Box a primitive id-keyed tag once, for both interception and storage
  
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- Let C2 inline the constructors of TagMap's nested classes
  
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- Remove TagMap's remaining synthetic accessors and guard against them
  
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- Size a copied dense store to what its source holds
  
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- Size each span's dense tag store per operation
  
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Commits on Oct 12, 2026
- Tune a span's sizing hint when it finishes, not only at serialization
  
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- Copy a source's dense tags into a presized map's own arrays
  
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- Add a by-id counterpart to SpanCreationBenchmark
  
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Commits on Oct 13, 2026
- Box a primitive tag only when the store keeps the box
  
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Commits on Oct 14, 2026
- Merge tag-registry-direction-resolution (#12731) into dense-store-v3
  
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  9f81ba4
- Merge tag-registry-direction-resolution (#12731) into dense-store-v3
  
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  3a178f5
- Re-apply split-by-tags language by its id
  
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- Say what a tag id's intercepted bit does and doesn't decide
  
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  5ba0a09
Commits on Oct 15, 2026
- Color known tags into co-occurrence slots in their ids
  
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- Merge tag-slot-coloring (#12882) into dense-store-v3
  
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- Drop a local benchmark committed by mistake
  
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- Make SizingHintTable package-private behind SizingHint.forOperation
  
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- Share one boxed path across the primitive id setters
  
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  768339e
- Make TagMap's factory initialization independent of order
  
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- Run the shared TagMap suites against both stores
  
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- Call the default TagMap factory directly when creating from a parent
  
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Commits

Commits on Oct 10, 2026

Commits on Oct 11, 2026

Commits on Oct 12, 2026

Commits on Oct 13, 2026

Commits on Oct 14, 2026

Commits on Oct 15, 2026