feat(wall): support signal suppression for unfiltered threads#663
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CI Test ResultsRun: #29839530745 | Commit:
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Legend: ✅ passed | ❌ failed | ⚪ skipped | 🚫 cancelled Summary: Total: 32 | Passed: 32 | Failed: 0 Updated: 2026-07-21 14:50:57 UTC |
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Benchmark Results (commit fb1c44d)Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/125547869 Commit:
|
| Benchmark | JDK | Latest | Dev | Δ (dev vs latest) | Issues L/D |
|---|---|---|---|---|---|
| akka-uct | 21 | ✅ 10210 ms (21 iters) | ✅ 10256 ms (21 iters) | ≈ +0.5% (±10.9%) | — / — |
| akka-uct | 25 | ✅ 8953 ms (24 iters) | ✅ 8890 ms (24 iters) | ≈ -0.7% (±10.2%) | — / — |
| finagle-chirper | 21 | ✅ 6000 ms (33 iters) | ✅ 5960 ms (33 iters) | ≈ -0.7% (±25.4%) | |
| finagle-chirper | 25 | ✅ 5431 ms (36 iters) | ✅ 5443 ms (36 iters) | ≈ +0.2% (±24.6%) | |
| fj-kmeans | 21 | ✅ 2679 ms (70 iters) | ✅ 2836 ms (66 iters) | 🔴 +5.9% | — / — |
| fj-kmeans | 25 | ✅ 2847 ms (66 iters) | ✅ 2828 ms (66 iters) | ≈ -0.7% (±2.6%) | — / — |
| future-genetic | 21 | ✅ 2083 ms (89 iters) | ✅ 2162 ms (86 iters) | 🔴 +3.8% | — / — |
| future-genetic | 25 | ✅ 2076 ms (90 iters) | ✅ 2122 ms (88 iters) | ≈ +2.2% (±2.5%) | — / — |
| naive-bayes | 21 | ✅ 1252 ms (136 iters) | ✅ 1248 ms (137 iters) | ≈ -0.3% (±32.7%) | — / — |
| naive-bayes | 25 | ✅ 1008 ms (170 iters) | ✅ 1023 ms (167 iters) | ≈ +1.5% (±31.7%) | — / — |
| reactors | 21 | ✅ 16312 ms (15 iters) | ✅ 16357 ms (15 iters) | ≈ +0.3% (±8.8%) | — / — |
| reactors | 25 | ✅ 18416 ms (15 iters) | ✅ 18780 ms (15 iters) | ≈ +2% (±3.6%) | — / — |
Internal counter details (ddprof)
ddprof internal counters, latest / dev (✅ = 0, · = unavailable):
| Benchmark | JDK | Dropped rec | Dropped jvmti | Dropped trace | Skipped WC | AGCT fail | Unwind fail |
|---|---|---|---|---|---|---|---|
| akka-uct | 21 | ✅ / ✅ | ✅ / ✅ | 2 / ✅ | 1891 / 2004 | ✅ / ✅ | ✅ / ✅ |
| akka-uct | 25 | ✅ / ✅ | ✅ / ✅ | 1 / 1 | 2305 / 2283 | ✅ / ✅ | ✅ / ✅ |
| finagle-chirper | 21 | ✅ / ✅ | ✅ / ✅ | 4 / 2 | 8183 / 8674 | ✅ / ✅ | ✅ / ✅ |
| finagle-chirper | 25 | ✅ / ✅ | ✅ / ✅ | ✅ / ✅ | 8087 / 8641 | ✅ / ✅ | ✅ / ✅ |
| fj-kmeans | 21 | ✅ / ✅ | ✅ / ✅ | 2 / 2 | 1270 / 1278 | ✅ / ✅ | ✅ / ✅ |
| fj-kmeans | 25 | ✅ / ✅ | ✅ / ✅ | 3 / 3 | 1282 / 1275 | ✅ / ✅ | ✅ / ✅ |
| future-genetic | 21 | ✅ / ✅ | ✅ / ✅ | 1 / 3 | 2966 / 3007 | ✅ / ✅ | ✅ / ✅ |
| future-genetic | 25 | ✅ / ✅ | ✅ / ✅ | 2 / ✅ | 2992 / 2972 | ✅ / ✅ | ✅ / ✅ |
| naive-bayes | 21 | ✅ / ✅ | ✅ / ✅ | 3 / 6 | 3491 / 3501 | ✅ / ✅ | ✅ / ✅ |
| naive-bayes | 25 | ✅ / ✅ | ✅ / ✅ | 1 / 5 | 3488 / 3493 | ✅ / ✅ | ✅ / ✅ |
| reactors | 21 | ✅ / ✅ | ✅ / ✅ | 2 / ✅ | 1711 / 1786 | ✅ / ✅ | ✅ / ✅ |
| reactors | 25 | ✅ / ✅ | ✅ / ✅ | ✅ / ✅ | 1819 / 1920 | ✅ / ✅ | ✅ / ✅ |
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Benchmark Results (commit 1118f62)Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/125554643 Commit:
|
| Benchmark | JDK | Latest | Dev | Δ (dev vs latest) | Issues L/D |
|---|---|---|---|---|---|
| akka-uct | 21 | ✅ 10294 ms (21 iters) | ✅ 10251 ms (21 iters) | ≈ -0.4% (±11.4%) | — / — |
| akka-uct | 25 | ✅ 8933 ms (24 iters) | ✅ 8835 ms (24 iters) | ≈ -1.1% (±10%) | — / — |
| finagle-chirper | 21 | ✅ 6016 ms (33 iters) | ✅ 6034 ms (33 iters) | ≈ +0.3% (±25.3%) | |
| finagle-chirper | 25 | ✅ 5462 ms (36 iters) | ✅ 5452 ms (36 iters) | ≈ -0.2% (±24.6%) | |
| fj-kmeans | 21 | ✅ 2808 ms (66 iters) | ✅ 2698 ms (70 iters) | 🟢 -3.9% | — / — |
| fj-kmeans | 25 | ✅ 2812 ms (66 iters) | ✅ 2813 ms (66 iters) | ≈ +0% (±2.6%) | — / — |
| future-genetic | 21 | ✅ 2067 ms (90 iters) | ✅ 2083 ms (90 iters) | ≈ +0.8% (±2.7%) | — / — |
| future-genetic | 25 | ✅ 2088 ms (89 iters) | ✅ 2001 ms (93 iters) | 🟢 -4.2% | — / — |
| naive-bayes | 21 | ✅ 1239 ms (138 iters) | ✅ 1231 ms (138 iters) | ≈ -0.6% (±32.7%) | — / — |
| naive-bayes | 25 | ✅ 1019 ms (168 iters) | ✅ 1011 ms (169 iters) | ≈ -0.8% (±32.1%) | — / — |
| reactors | 21 | ✅ 16149 ms (15 iters) | ✅ 16215 ms (15 iters) | ≈ +0.4% (±8.4%) | — / — |
| reactors | 25 | ✅ 18598 ms (15 iters) | ✅ 18345 ms (15 iters) | ≈ -1.4% (±5.1%) | — / — |
Internal counter details (ddprof)
ddprof internal counters, latest / dev (✅ = 0, · = unavailable):
| Benchmark | JDK | Dropped rec | Dropped jvmti | Dropped trace | Skipped WC | AGCT fail | Unwind fail |
|---|---|---|---|---|---|---|---|
| akka-uct | 21 | ✅ / ✅ | ✅ / ✅ | 2 / 2 | 1978 / 1973 | ✅ / ✅ | ✅ / ✅ |
| akka-uct | 25 | ✅ / ✅ | ✅ / ✅ | 2 / ✅ | 2287 / 2449 | ✅ / ✅ | ✅ / ✅ |
| finagle-chirper | 21 | ✅ / ✅ | ✅ / ✅ | 2 / 2 | 8978 / 8724 | ✅ / ✅ | ✅ / ✅ |
| finagle-chirper | 25 | ✅ / ✅ | ✅ / ✅ | ✅ / ✅ | 8633 / 8297 | ✅ / ✅ | ✅ / ✅ |
| fj-kmeans | 21 | ✅ / ✅ | ✅ / ✅ | 2 / 1 | 1257 / 1281 | ✅ / ✅ | ✅ / ✅ |
| fj-kmeans | 25 | ✅ / ✅ | ✅ / ✅ | 1 / 4 | 1280 / 1268 | ✅ / ✅ | ✅ / ✅ |
| future-genetic | 21 | ✅ / ✅ | ✅ / ✅ | ✅ / 3 | 2909 / 2923 | ✅ / ✅ | ✅ / ✅ |
| future-genetic | 25 | ✅ / ✅ | ✅ / ✅ | 2 / 5 | 2847 / 2887 | ✅ / ✅ | ✅ / ✅ |
| naive-bayes | 21 | ✅ / ✅ | ✅ / ✅ | 7 / 4 | 3492 / 3493 | ✅ / ✅ | ✅ / ✅ |
| naive-bayes | 25 | ✅ / ✅ | ✅ / ✅ | 4 / 2 | 3463 / 3473 | ✅ / ✅ | ✅ / ✅ |
| reactors | 21 | ✅ / ✅ | ✅ / ✅ | ✅ / 1 | 1761 / 1721 | ✅ / ✅ | ✅ / ✅ |
| reactors | 25 | ✅ / ✅ | ✅ / ✅ | ✅ / ✅ | 1916 / 1880 | ✅ / ✅ | ✅ / ✅ |
Contributor
Benchmark Results (commit 40dbe8e)Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/125596529 Commit:
|
| Benchmark | JDK | Latest | Dev | Δ (dev vs latest) | Issues L/D |
|---|---|---|---|---|---|
| akka-uct | 21 | ✅ 10340 ms (21 iters) | ✅ 10312 ms (21 iters) | ≈ -0.3% (±11.6%) | — / — |
| akka-uct | 25 | ✅ 8871 ms (24 iters) | ✅ 8849 ms (24 iters) | ≈ -0.2% (±10.1%) | — / — |
| finagle-chirper | 21 | ✅ 6017 ms (33 iters) | ✅ 6015 ms (33 iters) | ≈ -0% (±25%) | |
| finagle-chirper | 25 | ✅ 5470 ms (36 iters) | ✅ 5509 ms (36 iters) | ≈ +0.7% (±24.2%) | |
| fj-kmeans | 21 | ✅ 2823 ms (66 iters) | ✅ 2748 ms (68 iters) | 🟢 -2.7% | — / — |
| fj-kmeans | 25 | ✅ 2856 ms (66 iters) | ✅ 2847 ms (66 iters) | ≈ -0.3% (±2.6%) | — / — |
| future-genetic | 21 | ✅ 2041 ms (90 iters) | ✅ 2125 ms (88 iters) | 🔴 +4.1% | — / — |
| future-genetic | 25 | ✅ 1994 ms (93 iters) | ✅ 2110 ms (88 iters) | 🔴 +5.8% | — / — |
| naive-bayes | 21 | ✅ 1247 ms (137 iters) | ✅ 1259 ms (135 iters) | ≈ +1% (±33.5%) | — / — |
| naive-bayes | 25 | ✅ 1027 ms (167 iters) | ✅ 1018 ms (168 iters) | ≈ -0.9% (±31.5%) | — / — |
| reactors | 21 | ✅ 16583 ms (15 iters) | ✅ 16798 ms (15 iters) | ≈ +1.3% (±7.5%) | — / — |
| reactors | 25 | ✅ 18582 ms (15 iters) | ✅ 18610 ms (15 iters) | ≈ +0.2% (±5.1%) | — / — |
Internal counter details (ddprof)
ddprof internal counters, latest / dev (✅ = 0, · = unavailable):
| Benchmark | JDK | Dropped rec | Dropped jvmti | Dropped trace | Skipped WC | AGCT fail | Unwind fail |
|---|---|---|---|---|---|---|---|
| akka-uct | 21 | ✅ / ✅ | ✅ / ✅ | ✅ / 6 | 1978 / 1998 | ✅ / ✅ | ✅ / ✅ |
| akka-uct | 25 | ✅ / ✅ | ✅ / ✅ | ✅ / 1 | 2344 / 2271 | ✅ / ✅ | ✅ / ✅ |
| finagle-chirper | 21 | ✅ / ✅ | ✅ / ✅ | 2 / 2 | 8863 / 8312 | ✅ / ✅ | ✅ / ✅ |
| finagle-chirper | 25 | ✅ / ✅ | ✅ / ✅ | 1 / ✅ | 8368 / 8738 | ✅ / ✅ | ✅ / ✅ |
| fj-kmeans | 21 | ✅ / ✅ | ✅ / ✅ | 7 / 1 | 1284 / 1242 | ✅ / ✅ | ✅ / ✅ |
| fj-kmeans | 25 | ✅ / ✅ | ✅ / ✅ | 1 / 4 | 1302 / 1289 | ✅ / ✅ | ✅ / ✅ |
| future-genetic | 21 | ✅ / ✅ | ✅ / ✅ | 1 / 1 | 2979 / 2980 | ✅ / ✅ | ✅ / ✅ |
| future-genetic | 25 | ✅ / ✅ | ✅ / ✅ | ✅ / ✅ | 2847 / 2862 | ✅ / ✅ | ✅ / ✅ |
| naive-bayes | 21 | ✅ / ✅ | ✅ / ✅ | 4 / 5 | 3520 / 3534 | ✅ / ✅ | ✅ / ✅ |
| naive-bayes | 25 | ✅ / ✅ | ✅ / ✅ | 3 / 3 | 3523 / 3509 | ✅ / ✅ | ✅ / ✅ |
| reactors | 21 | ✅ / ✅ | ✅ / ✅ | 2 / 2 | 1682 / 1809 | ✅ / ✅ | ✅ / ✅ |
| reactors | 25 | ✅ / ✅ | ✅ / ✅ | 2 / ✅ | 1806 / 1871 | ✅ / ✅ | ✅ / ✅ |
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Pull request overview
Extends wall-clock “owned-block” signal suppression to unfiltered (explicit filter=) wall recordings when wallprecheck=true, by introducing a thread registry keyed by native TID and integrating it into both ASGCT and JVMTI wall-clock sampling paths.
Changes:
- Added unfiltered wall thread registry support (native TID indexing, lifecycle generations, recording epochs) and wired it into profiler lifecycle + wall-clock precheck logic.
- Added a bounded candidate-selection/backfill mechanism for precheck to avoid reverting to O(N) registry work per wall tick under heavy suppression.
- Added Java integration tests, C++ unit tests, and a JMH benchmark to validate behavior and measure overhead.
Reviewed changes
Copilot reviewed 22 out of 22 changed files in this pull request and generated 3 comments.
Show a summary per file
| File | Description |
|---|---|
| ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/UnfilteredWallPrecheckTest.java | New integration coverage for suppression behavior in explicit-empty-filter wall recordings. |
| ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/UnfilteredWallPrecheckRestartTest.java | Verifies registry activation does not leak across recording restarts and handles stopped gaps safely. |
| ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/JvmtiBasedUnfilteredWallPrecheckTest.java | Ensures the unfiltered path works when wall sampling delegates stacks via JVMTI. |
| ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/J9WallClockPrecheckCapabilityTest.java | Confirms J9 wall engine capability gating prevents activation of unfiltered tracking. |
| ddprof-test/src/test/java/com/datadoghq/profiler/AbstractProfilerTest.java | Adds beforeProfilerStart() hook to allow test setup before profiler thread callbacks are enabled. |
| ddprof-stresstest/src/jmh/java/com/datadoghq/profiler/WallClockPrecheckBenchmarkHooks.java | Exposes owned-block hooks to benchmarks without widening core API surface. |
| ddprof-stresstest/src/jmh/java/com/datadoghq/profiler/stresstest/scenarios/throughput/WallClockPrecheckOverheadBenchmark.java | Adds throughput benchmark comparing wallprecheck=false/true as owned-block population grows. |
| ddprof-lib/src/test/cpp/wallprecheck_args_ut.cpp | Adds capability tests and verifies explicit-empty vs omitted filter parsing behavior. |
| ddprof-lib/src/test/cpp/wallClockCandidateSelector_ut.cpp | Unit-tests the new bounded candidate selection logic. |
| ddprof-lib/src/test/cpp/threadFilter_ut.cpp | Expands tests for registry/epoch/lifecycle behavior and adjusts TID usage in recovery test. |
| ddprof-lib/src/main/cpp/wallClockCandidateSelector.h | Adds reusable “randomized prefix without replacement” candidate selection with stats. |
| ddprof-lib/src/main/cpp/wallClock.h | Integrates candidate selector and adds bounded-visit backfill path to the wall timer loop. |
| ddprof-lib/src/main/cpp/wallClock.cpp | Updates precheck suppression to validate registry identity + context transitions; supports lazy registry lookups. |
| ddprof-lib/src/main/cpp/threadFilter.h | Introduces registry state (TID index, epochs, lifecycle generation) and APIs for unfiltered tracking. |
| ddprof-lib/src/main/cpp/threadFilter.cpp | Implements lock-free lookups + mutex-serialized writers for TID indexing, epoch refresh, and retirement. |
| ddprof-lib/src/main/cpp/profiler.h | Declares bootstrap of existing Java threads for registry population. |
| ddprof-lib/src/main/cpp/profiler.cpp | Boots existing Java threads into registry when unfiltered tracking is active; deactivates registry on stop/failure. |
| ddprof-lib/src/main/cpp/jvmThread.h | Adds capability check for cross-thread native TID lookup support. |
| ddprof-lib/src/main/cpp/jvmThread.cpp | Implements native TID lookup support predicate. |
| ddprof-lib/src/main/cpp/javaApi.cpp | Ensures TLS slot binding is validated/refreshed before using owned-block and filter APIs. |
| ddprof-lib/src/main/cpp/engine.h | Adds wall-engine capability hook for unfiltered precheck support. |
| ddprof-lib/src/main/cpp/counters.h | Adds counters for registry bootstrap and bounded-lookup/backfill diagnostics. |
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Contributor
Benchmark Results (commit d82291f)Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/125875202 Commit: ✅ Within expected boundariesNo significant runtime deltas (all within run-to-run noise) and no internal-counter outliers. Runtime details (per benchmark × JDK)
Internal counter details (ddprof)ddprof internal counters, latest / dev (✅ = 0, · = unavailable):
|
Contributor
Benchmark Results (commit ec76f58)Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/125883187 Commit:
|
| Benchmark | JDK | Latest | Dev | Δ (dev vs latest) | Issues L/D |
|---|---|---|---|---|---|
| akka-uct | 21 | ✅ 10350 ms (21 iters) | ✅ 10305 ms (21 iters) | ≈ -0.4% (±11.3%) | — / — |
| akka-uct | 25 | ✅ 8864 ms (24 iters) | ✅ 8976 ms (24 iters) | ≈ +1.3% (±10.4%) | — / — |
| finagle-chirper | 25 | ✅ 5472 ms (36 iters) | ✅ 5418 ms (36 iters) | ≈ -1% (±24.3%) | |
| fj-kmeans | 21 | ✅ 2839 ms (66 iters) | ✅ 2724 ms (68 iters) | 🟢 -4.1% | — / — |
| fj-kmeans | 25 | ✅ 2851 ms (66 iters) | ✅ 2836 ms (66 iters) | ≈ -0.5% (±2.6%) | — / — |
| future-genetic | 21 | ✅ 2066 ms (89 iters) | ✅ 2127 ms (87 iters) | 🔴 +3% | — / — |
| future-genetic | 25 | ✅ 2006 ms (92 iters) | ✅ 2122 ms (87 iters) | 🔴 +5.8% | — / — |
| naive-bayes | 21 | ✅ 1277 ms (134 iters) | ✅ 1289 ms (133 iters) | ≈ +0.9% (±32.4%) | — / — |
| naive-bayes | 25 | ✅ 1021 ms (167 iters) | ✅ 1023 ms (168 iters) | ≈ +0.2% (±31.6%) | — / — |
| reactors | 21 | ✅ 15903 ms (15 iters) | ✅ 16452 ms (15 iters) | ≈ +3.5% (±8.8%) | — / — |
| reactors | 25 | ✅ 18032 ms (15 iters) | ✅ 18628 ms (15 iters) | ≈ +3.3% (±4.7%) | — / — |
Internal counter details (ddprof)
ddprof internal counters, latest / dev (✅ = 0, · = unavailable):
| Benchmark | JDK | Dropped rec | Dropped jvmti | Dropped trace | Skipped WC | AGCT fail | Unwind fail |
|---|---|---|---|---|---|---|---|
| akka-uct | 21 | ✅ / ✅ | ✅ / ✅ | ✅ / ✅ | ✅ / ✅ | ✅ / ✅ | ✅ / ✅ |
| akka-uct | 25 | ✅ / ✅ | ✅ / ✅ | 1 / 3 | 2089 / 2428 | ✅ / ✅ | ✅ / ✅ |
| finagle-chirper | 21 | ✅ / ✅ | ✅ / ✅ | 7 / 2 | 8520 / 8487 | ✅ / ✅ | ✅ / ✅ |
| finagle-chirper | 25 | ✅ / ✅ | ✅ / ✅ | 4 / 2 | 8382 / 8319 | ✅ / ✅ | ✅ / ✅ |
| fj-kmeans | 21 | ✅ / ✅ | ✅ / ✅ | 4 / 4 | 1278 / 1277 | ✅ / ✅ | ✅ / ✅ |
| fj-kmeans | 25 | ✅ / ✅ | ✅ / ✅ | 4 / ✅ | 1290 / 1289 | ✅ / ✅ | ✅ / ✅ |
| future-genetic | 21 | ✅ / ✅ | ✅ / ✅ | 3 / 2 | 2953 / 3032 | ✅ / ✅ | ✅ / ✅ |
| future-genetic | 25 | ✅ / ✅ | ✅ / ✅ | 2 / 2 | 2846 / 2856 | ✅ / ✅ | ✅ / ✅ |
| naive-bayes | 21 | ✅ / ✅ | ✅ / ✅ | 3 / 3 | 3534 / 3561 | ✅ / ✅ | ✅ / ✅ |
| naive-bayes | 25 | ✅ / ✅ | ✅ / ✅ | 1 / 3 | 3480 / 3510 | ✅ / ✅ | ✅ / ✅ |
| reactors | 21 | ✅ / ✅ | ✅ / ✅ | 1 / ✅ | 1614 / 1718 | ✅ / ✅ | ✅ / ✅ |
| reactors | 25 | ✅ / ✅ | ✅ / ✅ | ✅ / 3 | 1962 / 1876 | ✅ / ✅ | ✅ / ✅ |
Contributor
Benchmark Results (commit 52def55)Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/125986872 Commit: ✅ Within expected boundariesNo significant runtime deltas (all within run-to-run noise) and no internal-counter outliers. Runtime details (per benchmark × JDK)
Internal counter details (ddprof)ddprof internal counters, latest / dev (✅ = 0, · = unavailable):
|
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What does this PR do?:
Extends wall-clock signal suppression to threads sampled through the existing explicit
filter=mode.When wall profiling runs with both
filter=andwallprecheck=true, the profiler now:The existing context-filtered behavior remains unchanged. This PR does not change the meaning of
filter=.Motivation:
With
filter=, wall-clock profiling already samples every thread. However, threads outside an active context did not have the lifecycle metadata required to recognize and suppress repeated samples from the same profiler-owned blocking run.This change closes that metadata gap. It also provides the thread lifecycle machinery needed by the follow-up TaskBlock work for non-context threads.
Implementation notes:
filter=together withwallprecheck=true.How to test the change?:
./.claude/commands/build-and-summarize :ddprof-lib:gtestDebug_threadFilter_ut :ddprof-lib:gtestDebug_wallprecheck_args_ut./.claude/commands/build-and-summarize :ddprof-test:testDebug -Ptests="*UnfilteredWallPrecheck*"./.claude/commands/build-and-summarize testDebugFor Datadog employees:
of any kind, I've requested a security review.