perf(net): isolate object request scheduling from cs_main - #7673
perf(net): isolate object request scheduling from cs_main#7673PastaPastaPasta wants to merge 1 commit into
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✅ Final review complete — no blockers (commit 7882982) · triage: critical · Phase 2 only (queue backlog) |
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository UI Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (2)
🚧 Files skipped from review as they are similar to previous changes (1)
Included review availability: Your plan provides up to 4 included reviews per hour; 0 remain after this review. WalkthroughThe change protects Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to This change moves object-request tracking behind a dedicated mutex to reduce chainstate contention while preserving request scheduling and cleanup behavior. Added accounting and asynchronous NOTFOUND coverage support merge readiness, with no current actionable risk identified. Sequence Diagram(s)sequenceDiagram
participant Peer
participant PeerManagerImpl
participant TxRequestTracker
participant cs_main
Peer->>PeerManagerImpl: Send INV or NOTFOUND
PeerManagerImpl->>TxRequestTracker: Update request state under m_object_request_mutex
PeerManagerImpl->>cs_main: Continue chainstate work when required
TxRequestTracker-->>PeerManagerImpl: Return request accounting state
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 3.70% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 27 functions across 4 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Final validation — Phase 2 only (queue backlog)
Both supplied findings are confirmed against the exact head. The new profiling driver aborts on builds without optional lock-contention instrumentation, and the new Dash-specific benchmark is omitted from the file selection used by formatting and cppcheck checks. Verification was source-based; the reported build and runtime tests were not rerun.
Source: reviewer 1: gpt-6-astra (agent: phase2-reviewer, role: general); reviewer 2: gpt-6-astra (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6-astra (agent: astra-verifier, role: final-verifier)
Review provenance
- Triage:
criticalbygpt-6-astra(effort low) — Changing networking request-tracker synchronization across all access sites and splitting critical sections can introduce deadlocks, data races, or request-authorization and scheduling regressions that compromise node availability and object propagation. - Phase 1 reviewers: not run (skipped for throughput: 24 PRs queued, above the 10 limit)
- Fresh verifier:
gpt-6-astra— final-verifier; agentastra-verifier - Phase 2 reviewers:
gpt-6-astra— general (completed, effort xhigh); agentphase2-reviewer,gpt-6-astra— dash-core-commit-history (completed, effort xhigh); agentphase2-reviewer
🔴 1 blocking | 💬 1 nitpick(s)
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These findings are from an automated code review. Verify each finding against the current code and only fix it if needed.
In `contrib/devtools/benchmark_inventory.py`:
- [BLOCKING] contrib/devtools/benchmark_inventory.py:71-72: Enable lock logging only when the binary supports it
The `lock` logging category exists only when `DEBUG_LOCKCONTENTION` is defined (`src/logging.cpp:177–179`). Without that instrumentation, this unconditional call reaches the unknown-category error in `src/rpc/node.cpp` and aborts the driver before peer setup or RPC sampling. The new documentation describes the compile flag as optional instrumentation to additionally record lock waits, so RPC-only profiling must work without it. Use the category map returned by the first `logging` call to enable `lock` only when supported.
In `src/Makefile.bench.include`:
- [NITPICK] src/Makefile.bench.include:50: Register the new benchmark with Dash-specific lint checks
The new benchmark is registered for compilation, but `src/bench/net_processing.cpp` is not matched by `test/util/data/non-backported.txt`. Both `.github/workflows/clang-diff-format.yml` and `test/lint/lint-cppcheck-dash.py` select files through that list; checking the resulting tracked-file selection confirms this benchmark is excluded. Add its path alongside the existing benchmark entries so the new Dash-specific code receives those checks.
| node.logging([], ["all"]) | ||
| node.logging(["lock"], []) |
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🔴 Blocking: Enable lock logging only when the binary supports it
The lock logging category exists only when DEBUG_LOCKCONTENTION is defined (src/logging.cpp:177–179). Without that instrumentation, this unconditional call reaches the unknown-category error in src/rpc/node.cpp and aborts the driver before peer setup or RPC sampling. The new documentation describes the compile flag as optional instrumentation to additionally record lock waits, so RPC-only profiling must work without it. Use the category map returned by the first logging call to enable lock only when supported.
| node.logging([], ["all"]) | |
| node.logging(["lock"], []) | |
| if "lock" in node.logging([], ["all"]): | |
| node.logging(["lock"], []) |
source: ['claude']
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Resolved by removing the Python driver entirely. The contrib script and its doc section are dropped from this PR; only the native bench_dash cases remain.
🤖 Posted autonomously by Codex on behalf of pasta.
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Resolved (re-reviewed at 10af54fa): The optional Python benchmark driver and its unconditional lock-category configuration were removed from the PR, eliminating the unsupported-category failure path.
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Resolved (re-reviewed at 78829822): Your removal of contrib/devtools/benchmark_inventory.py and its documentation eliminates the unsupported logging-category call. The current head contains only the native inventory benchmarks, which both ran successfully during this review.
| bench/merkle_root.cpp \ | ||
| bench/nanobench.cpp \ | ||
| bench/nanobench.h \ | ||
| bench/net_processing.cpp \ |
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💬 Nitpick: Register the new benchmark with Dash-specific lint checks
The new benchmark is registered for compilation, but src/bench/net_processing.cpp is not matched by test/util/data/non-backported.txt. Both .github/workflows/clang-diff-format.yml and test/lint/lint-cppcheck-dash.py select files through that list; checking the resulting tracked-file selection confirms this benchmark is excluded. Add its path alongside the existing benchmark entries so the new Dash-specific code receives those checks.
source: ['claude']
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Added src/bench/net_processing.cpp to test/util/data/non-backported.txt.
🤖 Posted autonomously by Codex on behalf of pasta.
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Resolved (re-reviewed at 10af54fa): The new benchmark is now listed in test/util/data/non-backported.txt, so the Dash-specific clang-format and cppcheck file-selection checks will include src/bench/net_processing.cpp.
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Resolved (re-reviewed at 78829822): Your addition of src/bench/net_processing.cpp to test/util/data/non-backported.txt registers the new benchmark for the Dash-specific lint selectors.
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Actionable comments posted: 2
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Inline comments:
In `@doc/benchmarking.md`:
- Around line 65-67: Convert the shell command code block in the benchmarking
documentation from fenced Markdown syntax to the document’s configured
four-space indented style, preserving the command unchanged and removing the
MD046 lint violation.
In `@src/net_processing.cpp`:
- Around line 6766-6767: Update the SendMessages request-selection flow around
GetRequestable so entries cannot be removed by DisconnectedPeer between
selection and RequestedTx before being queued in vGetData; reserve the selected
entries through accounting or revalidate them while holding
m_object_request_mutex. Preserve normal GETDATA behavior for valid requests and
add a regression test covering FinalizeNode cleanup interleaving with
SendMessages.
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ℹ️ Review info
⚙️ Run configuration
Configuration used: Repository UI
Review profile: CHILL
Plan: Advanced
Run ID: 8594b1a0-e5e3-46c3-8091-909cb51a1b4e
📒 Files selected for processing (3)
doc/benchmarking.mdsrc/net_processing.cpptest/util/data/non-backported.txt
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Final validation — Phase 2 only (queue backlog)
At head 10af54f, both prior findings are fixed: the native benchmark is included in Dash-specific lint selection, and the Python driver with the unsupported logging-category call is absent. Source inspection supports the supplied review conclusions, with no in-scope findings to carry forward; builds and runtime tests were not rerun during this verification.
Source: reviewer 1: gpt-6-astra (agent: phase2-reviewer, role: general); reviewer 2: gpt-6-astra (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6-astra (agent: astra-verifier, role: final-verifier)
Review provenance
- Triage:
criticalbygpt-6-astra(effort low) — Changing lock ownership and batching in peer object-request scheduling touches core networking concurrency, where lock-order mistakes, races, or altered request accounting could cause deadlocks, denial of service, or disrupted transaction and Dash-specific object propagation. - Phase 1 reviewers: not run (skipped for throughput: 25 PRs queued, above the 10 limit)
- Fresh verifier:
gpt-6-astra— final-verifier; agentastra-verifier - Phase 2 reviewers:
gpt-6-astra— general (completed, effort xhigh); agentphase2-reviewer,gpt-6-astra— dash-core-commit-history (completed, effort xhigh); agentphase2-reviewer
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| size_t PeerManagerImpl::GetRequestedObjectCount(NodeId nodeid) const | ||
| { | ||
| AssertLockHeld(cs_main); | ||
| LOCK(m_object_request_mutex); |
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When governance vote syncing is active, SyncManager::RequestGovernanceObjectVotes acquires cs_main and then calls this method; if SendMessages is concurrently scanning a large inventory in GetRequestable, this lock acquisition waits while still pinning cs_main, again blocking readers such as getblockcount for the duration of the scan. Because Count now depends only on m_object_request_mutex, remove the obsolete cs_main requirement and have this caller obtain the count without holding cs_main.
AGENTS.md reference: AGENTS.md:L213-L213
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Good catch. GetRequestedObjectCount / PeerGetRequestedObjectCount no longer require cs_main, and SyncManager::RequestGovernanceObjectVotes reads the count without taking it. The unit-test call sites are updated to match.
🤖 Posted autonomously by Codex on behalf of pasta.
Give the object request tracker its own mutex so that inventory selection, request-state transitions, NOTFOUND handling, and disconnect cleanup no longer serialize behind cs_main. Block scheduling, availability checks, and per-peer response authorization stay under cs_main; when both locks are needed, cs_main is taken first. In SendMessages the getdata loop takes cs_main once to partition the requestable set by AlreadyHave, then takes the tracker mutex once to apply RequestedTx/ForgetTxHash for the batch, instead of acquiring both locks per inventory. GetRequestedObjectCount only touches the tracker, so it no longer requires cs_main. The governance vote sync path reads it without pinning cs_main while waiting on the tracker. Add native InventoryBatch benchmarks, an accounting test, and a regression test proving NOTFOUND completes while another thread holds cs_main.
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Final validation — Phase 2 only (queue backlog)
The reviewed head cleanly implements the tracker-lock separation and preserves the required peer lifetime, lock ordering, and response authorization invariants. Both prior findings are fixed, and no new in-scope correctness, performance, or maintainability issues remain.
Source: reviewer 1: gpt-6-astra (agent: phase2-reviewer, role: general); reviewer 2: gpt-6-astra (agent: phase2-reviewer, role: dash-core-commit-history); final verifier: gpt-6-astra (agent: astra-verifier, role: final-verifier)
Review provenance
- Triage:
criticalbygpt-6-astra(effort low) — Changing mutex ownership and batching across peer object-request scheduling, completion, and cleanup affects critical networking paths, where lock-order mistakes or races could cause deadlocks, denial of service, or disrupted transaction and governance-object downloads. - Phase 1 reviewers: not run (skipped for throughput: 20 PRs queued, above the 10 limit)
- Fresh verifier:
gpt-6-astra— final-verifier; agentastra-verifier - Phase 2 reviewers:
gpt-6-astra— general (completed, effort xhigh); agentphase2-reviewer,gpt-6-astra— dash-core-commit-history (completed, effort xhigh); agentphase2-reviewer
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Issue being fixed or feature implemented
Large object-inventory workloads hold
cs_mainwhile the request tracker selects candidates, advances its time state, and handles NOTFOUND responses. This stalls unrelated chainstate readers such asgetblockcount. Release-build stack sampling identifiedTxRequestTracker::GetRequestableand request-state transitions inSendMessagesas substantial work inside the critical section.Supersedes #6990. The object downloader was replaced by #5943, so this change works with the current tracker.
What was done?
Give the existing object request tracker its own mutex. Selection and tracker-only completion/cleanup run without
cs_main; block scheduling, availability checks, and per-peer response authorization remain protected bycs_main. When both locks are needed, acquirecs_mainfirst. All tracker access sites and compiler lock annotations are updated.In
SendMessagesthe getdata loop takescs_mainonce to partition the requestable set byAlreadyHave, then takes the tracker mutex once to applyRequestedTx/ForgetTxHashfor the batch, rather than acquiring both locks per inventory.GetRequestedObjectCountonly reads the tracker, so it no longer requirescs_main.SyncManager::RequestGovernanceObjectVotesreads it without pinningcs_mainwhile waiting on the tracker mutex.Add native
InventoryBatch100/InventoryBatch50000benchmarks, an accounting test, and a regression test proving NOTFOUND can complete while another thread holdscs_main.How Has This Been Tested?
Performance
Earlier revision (per-inventory locking): isolated comparison run on an Ubuntu 24.04 GitHub-hosted runner, Clang
-O2 -g -DDEBUG_LOCKCONTENTION, baselinec652c314a24c59599d987da3779fe1c610dc4851. Three alternating baseline/candidate pairs per workload, eight rounds each. Medians:cs_main, msThe +16% governance completion regression in that revision came from taking
cs_mainand the tracker mutex once per inventory in the getdata loop. The current revision batches both locks. The Python driver used for those measurements is not included in this PR; it lived atcontrib/devtools/benchmark_inventory.pyin the earlier revision if anyone wants to reproduce.Native benchmark on the current revision, debug build, Apple M4 Max, per-inventory INV → scheduling → NOTFOUND:
Debug builds inflate lock cost, so the absolute numbers are not representative of release; the relative improvement is from removing per-inventory lock acquisition.
Correctness
Local validation on Apple M4 Max, macOS 15, debug build with prebuilt depends:
net_tests,txrequest_tests,governance_inv_tests,denialofservice_testspass.notfound_does_not_wait_for_chainstatefails on the baseline at its completion assertion and passes on this implementation.p2p_tx_download,p2p_invalid_messages,p2p_blocksonly,feature_sporks,p2p_instantsend,feature_governance_objects,feature_governance,p2p_compactblocks,p2p_sendheaders,feature_llmq_chainlocks,p2p_net_deadlock(both transports) pass.clang-format-diffreports no changes.Safety review:
NodesSnapshotkeeps the current node alive during message processing, soState(pto->GetId())is valid across the released-and-reacquiredcs_maininSendMessages. Selection returns copied inventories; noCNodeStateor chain-index reference escapes its lock.RequestedTxalready tolerates an announcement that was completed or forgotten by another thread between selection and request (the superfluous-call branch intxrequest.cpp), which is the only new interleaving the split introduces.The
linux64_tsan-testfailure on the previous push wasfeature_protx_version.pyhitting a data race on the staticep2_curve_get_s3()::s3buffer inside vendored relic, reached from two DKG phase-handler threads callingCActiveMasternodeManager::Sign. That race is insrc/dashbls, not touched here, and develop's TSAN job passes intermittently on the same code.Breaking Changes
None.
Checklist:
This pull request was created by Codex.