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Merge bitcoin/bitcoin#33680: validation: do not wipe utxo cache for stats/scans/snapshots

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c6ca2b85a3 validation: do not wipe utxo cache for stats/scans/snapshots (Pieter Wuille)
7099e93d0a refactor: rename `FlushStateMode::ALWAYS` to `FORCE_FLUSH` (Lőrinc)

Pull request description:

  Revival of https://github.com/bitcoin/bitcoin/pull/30610#issuecomment-3432564955 with the remaining comments applied on top

  > Since #28280, the cost of a non-wiping sync of the UTXO cache is only proportional to the number of dirty entries, rather than proportional to the size of the entire cache. Because of that, there is no reason to perform a wiping flush in case the contents of the cache is still useful.
  >
  > Split the `FlushStateMode::ALWAYS` mode into a FORCE_SYNC (non-wiping) and a FORCE_FLUSH (wiping), and then use the former in `scantxoutset`, `gettxoutsetinfo`, snapshot creation.

  (slightly updated after #30214)

ACKs for top commit:
  optout21:
    reACK c6ca2b85a3
  cedwies:
    reACK c6ca2b8 (trivial)
  achow101:
    ACK c6ca2b85a3
  sedited:
    ACK c6ca2b85a3

Tree-SHA512: f3525a85dc512db4a0a9c749ad47c0d3fa44085a121aa54cd77646260a719c71f754ec6570ae77779c0ed68a24799116f79c686e7a17ce57a26f6a598f7bf926
This commit is contained in:
Ava Chow
2026-01-29 14:43:27 -08:00
parent f7e0c3d3d3 c6ca2b85a3
commit 4e4fa0199e
10 changed files with 38 additions and 35 deletions
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11
test/functional/interface_usdt_utxocache.py
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@@ -109,7 +109,8 @@ FLUSHMODE_NAME = {
0: "NONE",
1: "IF_NEEDED",
2: "PERIODIC",
3: "ALWAYS",
3: "FORCE_FLUSH",
4: "FORCE_SYNC",
}
@@ -385,12 +386,12 @@ class UTXOCacheTracepointTest(BitcoinTestFramework):
bpf["utxocache_flush"].open_perf_buffer(handle_utxocache_flush)
self.log.info("stop the node to flush the UTXO cache")
UTXOS_IN_CACHE = 2 # might need to be changed if the earlier tests are modified
UTXOS_IN_CACHE = 3 # might need to be changed if the earlier tests are modified
# A node shutdown causes two flushes. One that flushes UTXOS_IN_CACHE
# UTXOs and one that flushes 0 UTXOs. Normally the 0-UTXO-flush is the
# second flush, however it can happen that the order changes.
expected_flushes.append({"mode": "ALWAYS", "for_prune": False, "size": UTXOS_IN_CACHE})
expected_flushes.append({"mode": "ALWAYS", "for_prune": False, "size": 0})
expected_flushes.append({"mode": "FORCE_FLUSH", "for_prune": False, "size": UTXOS_IN_CACHE})
expected_flushes.append({"mode": "FORCE_FLUSH", "for_prune": False, "size": 0})
self.stop_node(0)
bpf.perf_buffer_poll(timeout=200)
@@ -415,7 +416,7 @@ class UTXOCacheTracepointTest(BitcoinTestFramework):
bpf["utxocache_flush"].open_perf_buffer(handle_utxocache_flush)
self.log.info("prune blockchain to trigger a flush for pruning")
expected_flushes.append({"mode": "NONE", "for_prune": True, "size": 0})
expected_flushes.append({"mode": "NONE", "for_prune": True, "size": BLOCKS_TO_MINE})
self.nodes[0].pruneblockchain(315)
bpf.perf_buffer_poll(timeout=500)