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{
  "commit": "3fe8064c9559f4cf40e1ebd31b196bbf4feccdf3",
  "tree": "022c72096d109d78550a700bc0e3e7c805959d8f",
  "parents": [
    "aca07904ae0caca3b84ca66b6136e2266712f4ec"
  ],
  "author": {
    "name": "birenroy",
    "email": "birenroy@google.com",
    "time": "Wed Sep 23 07:21:22 2026 -0700"
  },
  "committer": {
    "name": "Copybara-Service",
    "email": "copybara-worker@google.com",
    "time": "Wed Sep 23 07:22:13 2026 -0700"
  },
  "message": "Adds an `AbidingObjectPool` utility in `quiche/common`.\n\n`AbidingObjectPool` is a cache-friendly, thread-local slab object pool\nthat allocates contiguous spans of memory (slabs) and uses an intrusive\nfree-list within unallocated slots for O(1) object reuse.\n\nA design doc discussing the architectural decisions is included, as well\nas microbenchmarks. From a sample run of the microbenchmarks, here are\nsome observations:\n\n1. Throughput Parity in Steady-State\n   * In typical allocation-free cycles, `AbidingObjectPool` operates within **1–3ns** of TCMalloc\u0027s highly-optimized thread cache.\n2. Superior Compaction \u0026 Batch Deallocation\n   * During load surges and drains, `AbidingObjectPool` outperforms TCMalloc by \u003e25% while providing complete physical memory reclamation down to the 1-slab spare cache.\n3. Zero Heap Fragmentation\n   * `AbidingObjectPool` completely isolates allocations into homogeneous power-of-two aligned slabs, eliminating the primary driver of TCMalloc Central Cache Freelist (CFL) span retention and cross-object fragmentation.\n\nProtected by new code, not yet used.\n\nPiperOrigin-RevId: 986738969\n",
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