feat: add core TaskBlock event recording support by kaahos · Pull Request #664 · DataDog/java-profiler

kaahos · 2026-07-16T13:42:41Z

What does this PR do?:

Adds the core TaskBlock event emission machinery. Recognized blocked intervals are recorded synchronously at block exit, with native APIs, JFR metadata, counters, and wall precheck integration.

Motivation:

Blocked threads should not need to receive wall-clock signals just to represent blocking time. TaskBlock events let the profiler report known blocking intervals directly.

Additional Notes:

This PR adds the generic recording path only. Concrete JVM and native blocking producers are added in follow-up PRs.

How to test the change?:

Automated coverage includes TaskBlock recorder unit tests, Java API tests, wall precheck behavior, disabled-state behavior, and combined wall-clock mitigation tests.

./.claude/commands/build-and-summarize testDebug

For Datadog employees:

If this PR touches code that signs or publishes builds or packages, or handles credentials of any kind, I've requested a security review (run the dd:platform-security-review skill, or file a request via the PSEC review form).
bewaire also runs automatically on every PR.
This PR doesn't touch any of that.
JIRA: [JIRA-14931]

dd-octo-sts · 2026-07-16T14:04:02Z

CI Test Results

Run: #39636252372 | Commit: 61c1ba6 | Duration: 18m 56s (longest job)

✅ All 32 test jobs passed

Status Overview

JDK	glibc-aarch64/debug	glibc-amd64/debug	musl-aarch64/debug	musl-amd64/debug
8	-	✅	-	-
8-ibm	-	✅	-	-
8-j9	✅	✅	-	-
8-librca	-	-	✅	✅
8-orcl	-	✅	-	-
11	-	✅	-	-
11-j9	✅	✅	-	-
11-librca	-	-	✅	✅
17	✅	✅	-	-
17-graal	✅	✅	-	-
17-j9	✅	✅	-	-
17-librca	-	-	✅	✅
21	✅	✅	-	-
21-graal	✅	✅	-	-
21-librca	-	-	✅	✅
25	✅	✅	-	-
25-graal	✅	✅	-	-
25-librca	-	-	✅	✅

Legend: ✅ passed | ❌ failed | ⚪ skipped | 🚫 cancelled

Summary: Total: 32 | Passed: 32 | Failed: 0

Updated: 2026-10-21 16:58:14 UTC

dd-octo-sts · 2026-07-16T14:10:10Z

Reliability & Chaos Results

✅ All reliability & chaos checks passed Pipeline: https://gitlab.ddbuild.io/DataDog/java-profiler/-/pipelines/127205833

datadog-datadog-prod-us1 · 2026-07-16T15:20:27Z

Pipelines

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Copilot

Pull request overview

Adds first-class TaskBlock event recording to the Java profiler so known blocking intervals can be emitted directly (without relying on wall-clock sampling signals), including native/JFR plumbing and updates to wall-precheck behavior and tests.

Changes:

Introduces public Java API beginTaskBlock(int) / endTaskBlock(long, long, long) and native recording pipeline for datadog.TaskBlock.
Reworks wall-precheck suppression around lifecycle-owned blocked runs, including unfiltered registry tracking and bounded “lazy backfill” candidate selection.
Expands unit/integration/benchmark coverage for unfiltered precheck, restart safety, JVMTI delegation, and TaskBlock behavior.

Reviewed changes

Copilot reviewed 51 out of 51 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/WallclockMitigationsCombinedTest.java	Updates combined mitigation assertions to ensure context-scoped threads remain sampled and suppression counters don’t change.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/UnfilteredWallPrecheckTest.java	Adds integration coverage for owned-block prechecks when `filter=` samples every thread.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/UnfilteredWallPrecheckRestartTest.java	Adds restart/epoch safety coverage for unfiltered tracking across multiple recordings.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/TaskBlockAssertions.java	Adds JMC-based assertion helpers for `datadog.TaskBlock` contract validation.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/PrecheckTest.java	Updates precheck tests to new suppression semantics/counters and explicit `filter=` behavior.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/PrecheckEfficiencyTest.java	Adjusts workload tests to align with new lifecycle-owned suppression and explicit unfiltered sampling.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/JvmtiBasedUnfilteredWallPrecheckTest.java	Adds JVMTI-delegated stack path coverage for unfiltered owned-block precheck.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/JvmtiBasedPrecheckTest.java	Aligns JVMTI precheck tests with explicit `filter=` commands.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/JavaProfilerTaskBlockPreExistingThreadTest.java	Verifies TaskBlock TLS init for threads created before profiler startup.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/JavaProfilerTaskBlockDisabledTest.java	Verifies TaskBlock API stays inactive when not in all-thread scope.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/JavaProfilerTaskBlockApiTest.java	End-to-end coverage for paired TaskBlock API, nesting/token rules, context admission, vthreads, and live dump behavior.
ddprof-test/src/test/java/com/datadoghq/profiler/wallclock/J9WallClockPrecheckCapabilityTest.java	Ensures unsupported J9 wall engine doesn’t activate unfiltered precheck tracking.
ddprof-test/src/test/java/com/datadoghq/profiler/JavaProfilerApiSurfaceTest.java	Verifies TaskBlock API is public while internal hooks remain non-public.
ddprof-test/src/test/java/com/datadoghq/profiler/context/OtelContextStorageModeTest.java	Ensures trace context is cleared during cleanup (ordering with reset).
ddprof-test/src/test/java/com/datadoghq/profiler/context/AllNativeContextTest.java	Ensures trace context is cleared during cleanup (ordering with reset).
ddprof-test/src/test/java/com/datadoghq/profiler/AbstractProfilerTest.java	Adds `beforeProfilerStart()` hook and clears trace context on `stopProfiler()`.
ddprof-stresstest/src/jmh/java/com/datadoghq/profiler/WallClockPrecheckBenchmarkHooks.java	Exposes package-scoped hooks for benchmarking owned-block precheck overhead.
ddprof-stresstest/src/jmh/java/com/datadoghq/profiler/stresstest/scenarios/throughput/WallClockPrecheckOverheadBenchmark.java	Adds JMH benchmark for steady-state wall timer overhead vs. owned-block population size.
ddprof-lib/src/test/cpp/wallprecheck_args_ut.cpp	Adds engine capability and `filter=` parsing regression tests.
ddprof-lib/src/test/cpp/wallClockCounters_ut.cpp	Renames/updates suppression counter tests to owned-block suppression.
ddprof-lib/src/test/cpp/wallClockCandidateSelector_ut.cpp	Adds unit tests for bounded candidate selection/backfill logic.
ddprof-lib/src/test/cpp/threadFilter_ut.cpp	Expands ThreadFilter tests for registry, epoch, token encoding, and owned-block suppression eligibility.
ddprof-lib/src/test/cpp/taskBlockRecorder_ut.cpp	Adds unit tests for TaskBlock eligibility, rotation, and record/stack failure accounting.
ddprof-lib/src/test/cpp/park_state_ut.cpp	Updates tests to owned-block state semantics and slot-reset expectations.
ddprof-lib/src/test/cpp/jvmSupport_ut.cpp	Adds unit tests for platform vs. virtual thread classification via JNI table probing.
ddprof-lib/src/test/cpp/frame_ut.cpp	Adds unit test for `copyJvmtiFrames()` union-overlap safety.
ddprof-lib/src/main/java/com/datadoghq/profiler/JavaProfiler.java	Adds public TaskBlock API and native bindings; clarifies internal hook comments.
ddprof-lib/src/main/cpp/wallClockCounters.h	Renames suppressed-sample counter to owned-block suppression counter.
ddprof-lib/src/main/cpp/wallClockCandidateSelector.h	Introduces bounded randomized candidate selection with precheck-rejection backfill.
ddprof-lib/src/main/cpp/wallClock.h	Integrates candidate selector + new suppression counters and visit budgeting.
ddprof-lib/src/main/cpp/wallClock.cpp	Reworks precheck suppression to use ThreadFilter-owned block eligibility and optional lazy backfill/lookup accounting.
ddprof-lib/src/main/cpp/threadLocalData.h	Adds per-thread TaskBlock lifecycle state in TLS.
ddprof-lib/src/main/cpp/threadFilter.h	Adds registry/unfiltered tracking, epoching, owned-block snapshots/tokens, and suppression eligibility checks.
ddprof-lib/src/main/cpp/threadFilter.cpp	Implements registry/TID index, recording epochs, retirement, and owned-block suppression candidate logic.
ddprof-lib/src/main/cpp/taskBlockRecorder.h	Adds TaskBlock eligibility checks and recording helper APIs.
ddprof-lib/src/main/cpp/taskBlockRecorder.cpp	Implements duration thresholding and basic eligibility helpers.
ddprof-lib/src/main/cpp/profiler.h	Adds TaskBlock recording entry points and rotation/inflight coordination.
ddprof-lib/src/main/cpp/profiler.cpp	Adds TaskBlock recording implementation, rotation coordination, registry bootstrap for existing threads, and updated filter init semantics.
ddprof-lib/src/main/cpp/jvmThread.h	Adds capability query for native thread-id lookup support.
ddprof-lib/src/main/cpp/jvmThread.cpp	Implements native thread-id lookup capability helper.
ddprof-lib/src/main/cpp/jvmSupport.h	Declares `isPlatformThread()` helper for virtual thread rejection.
ddprof-lib/src/main/cpp/jvmSupport.cpp	Implements JNI table probing to detect virtual threads (JDK 19+).
ddprof-lib/src/main/cpp/jfrMetadata.h	Adds new JFR type id for TaskBlock.
ddprof-lib/src/main/cpp/jfrMetadata.cpp	Registers `datadog.TaskBlock` event metadata fields.
ddprof-lib/src/main/cpp/javaApi.cpp	Adds native implementations for TaskBlock API + registry-aware filter/add/remove and owned-block hooks.
ddprof-lib/src/main/cpp/frames.h	Adds `copyJvmtiFrames()` helper for overlapping JVMTI/ASGCT frame buffers.
ddprof-lib/src/main/cpp/flightRecorder.h	Adds TaskBlock recording entry points in recording/recorder.
ddprof-lib/src/main/cpp/flightRecorder.cpp	Implements TaskBlock event serialization and recorder entry.
ddprof-lib/src/main/cpp/event.h	Adds TaskBlock event struct; updates wall epoch suppressed counter field name/type usage.
ddprof-lib/src/main/cpp/engine.h	Adds wall-engine capability query for unfiltered precheck support.
ddprof-lib/src/main/cpp/counters.h	Adds counters for registry lookup budget/retirement and TaskBlock outcomes; renames suppression counter.

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dd-octo-sts · 2026-07-21T07:57:49Z

Benchmark Results (commit `ebab4c4`)

Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/125876908 Commit: ebab4c4a50fba6ef669b18c4aa0aebbdff629a4c

⚠️ Significant outliers

🔴 fj-kmeans (JDK 21): runtime +4.4% (2671→2788 ms)
🔴 future-genetic (JDK 21): runtime +3.6% (2054→2127 ms)

Runtime details (per benchmark × JDK)

Benchmark	JDK	Latest	Dev	Δ (dev vs latest)	Issues L/D
akka-uct	21	✅ 10309 ms (21 iters)	✅ 10352 ms (21 iters)	≈ +0.4% (±11.1%)	— / —
akka-uct	25	✅ 8971 ms (24 iters)	✅ 8823 ms (24 iters)	≈ -1.6% (±10.5%)	— / —
finagle-chirper	21	✅ 5997 ms (33 iters)	✅ 5974 ms (33 iters)	≈ -0.4% (±25.4%)	⚠️ W:3 / ⚠️ W:3
finagle-chirper	25	✅ 5455 ms (36 iters)	✅ 5469 ms (36 iters)	≈ +0.3% (±24.6%)	⚠️ W:3 / ⚠️ W:3
fj-kmeans	21	✅ 2671 ms (69 iters)	✅ 2788 ms (67 iters)	🔴 +4.4%	— / —
fj-kmeans	25	✅ 2765 ms (68 iters)	✅ 2778 ms (67 iters)	≈ +0.5% (±2.8%)	— / —
future-genetic	21	✅ 2054 ms (91 iters)	✅ 2127 ms (88 iters)	🔴 +3.6%	— / —
future-genetic	25	✅ 2027 ms (91 iters)	✅ 2069 ms (90 iters)	≈ +2.1% (±2.8%)	— / —
naive-bayes	21	✅ 1284 ms (133 iters)	✅ 1244 ms (137 iters)	≈ -3.1% (±32.2%)	— / —
naive-bayes	25	✅ 1013 ms (169 iters)	✅ 1017 ms (168 iters)	≈ +0.4% (±31.6%)	— / —
reactors	21	✅ 16291 ms (15 iters)	✅ 15943 ms (15 iters)	≈ -2.1% (±8.5%)	— / —
reactors	25	✅ 18609 ms (15 iters)	✅ 18693 ms (15 iters)	≈ +0.5% (±4%)	— / —

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	✅ / ✅	✅ / ✅	✅ / 3	1885 / 2016	✅ / ✅	✅ / ✅
akka-uct	25	✅ / ✅	✅ / ✅	6 / ✅	2056 / 2299	✅ / ✅	✅ / ✅
finagle-chirper	21	✅ / ✅	✅ / ✅	2 / 1	8787 / 8984	✅ / ✅	✅ / ✅
finagle-chirper	25	✅ / ✅	✅ / ✅	2 / 1	8287 / 8556	✅ / ✅	✅ / ✅
fj-kmeans	21	✅ / ✅	✅ / ✅	1 / 2	1235 / 1277	✅ / ✅	✅ / ✅
fj-kmeans	25	✅ / ✅	✅ / ✅	4 / 3	1295 / 1292	✅ / ✅	✅ / ✅
future-genetic	21	✅ / ✅	✅ / ✅	2 / 1	3001 / 3006	✅ / ✅	✅ / ✅
future-genetic	25	✅ / ✅	✅ / ✅	✅ / 1	2834 / 2887	✅ / ✅	✅ / ✅
naive-bayes	21	✅ / ✅	✅ / ✅	5 / 6	3513 / 3477	✅ / ✅	✅ / ✅
naive-bayes	25	✅ / ✅	✅ / ✅	2 / ✅	3500 / 3460	✅ / ✅	✅ / ✅
reactors	21	✅ / ✅	✅ / ✅	3 / ✅	1612 / 1583	✅ / ✅	✅ / ✅
reactors	25	✅ / ✅	✅ / ✅	3 / 2	1916 / 1954	✅ / ✅	✅ / ✅

dd-octo-sts · 2026-07-21T08:33:55Z

Benchmark Results (commit `19cbe47`)

Pipeline: https://gitlab.ddbuild.io/DataDog/apm-reliability/benchmarking-platform/-/pipelines/125884549 Commit: 19cbe4788734f0e123535816d373913189efef91

⚠️ Significant outliers

🔴 fj-kmeans (JDK 21): runtime +5.5% (2696→2843 ms)
🟢 reactors (JDK 21): runtime -7.7% (16927→15621 ms)

Runtime details (per benchmark × JDK)

Benchmark	JDK	Latest	Dev	Δ (dev vs latest)	Issues L/D
akka-uct	21	✅ 10377 ms (21 iters)	✅ 10184 ms (21 iters)	≈ -1.9% (±11.2%)	— / —
akka-uct	25	✅ 8790 ms (24 iters)	✅ 8896 ms (24 iters)	≈ +1.2% (±9.7%)	— / —
finagle-chirper	21	✅ 5965 ms (33 iters)	✅ 5956 ms (33 iters)	≈ -0.2% (±25.2%)	⚠️ W:3 / ⚠️ W:3
fj-kmeans	21	✅ 2696 ms (70 iters)	✅ 2843 ms (66 iters)	🔴 +5.5%	— / —
fj-kmeans	25	✅ 2796 ms (67 iters)	✅ 2746 ms (68 iters)	≈ -1.8% (±2.8%)	— / —
future-genetic	21	✅ 2052 ms (90 iters)	✅ 2099 ms (89 iters)	≈ +2.3% (±2.6%)	— / —
future-genetic	25	✅ 2035 ms (91 iters)	✅ 2047 ms (91 iters)	≈ +0.6% (±2.7%)	— / —
naive-bayes	21	✅ 1224 ms (139 iters)	✅ 1250 ms (136 iters)	≈ +2.1% (±33.2%)	— / —
naive-bayes	25	✅ 1016 ms (168 iters)	✅ 1017 ms (168 iters)	≈ +0.1% (±31.6%)	— / —
reactors	21	✅ 16927 ms (15 iters)	✅ 15621 ms (15 iters)	🟢 -7.7%	— / —
reactors	25	✅ 17980 ms (15 iters)	✅ 17858 ms (15 iters)	≈ -0.7% (±6.2%)	— / —

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	✅ / ✅	✅ / ✅	1 / 2	1969 / 1961	✅ / ✅	✅ / ✅
akka-uct	25	✅ / ✅	✅ / ✅	✅ / 3	2168 / 2325	✅ / ✅	✅ / ✅
finagle-chirper	21	✅ / ✅	✅ / ✅	3 / 1	8522 / 8623	✅ / ✅	✅ / ✅
finagle-chirper	25	✅ / ✅	✅ / ✅	3 / 1	8617 / 8387	✅ / ✅	✅ / ✅
fj-kmeans	21	✅ / ✅	✅ / ✅	1 / 2	1273 / 1252	✅ / ✅	✅ / ✅
fj-kmeans	25	✅ / ✅	✅ / ✅	1 / 2	1256 / 1264	✅ / ✅	✅ / ✅
future-genetic	21	✅ / ✅	✅ / ✅	3 / 1	2942 / 2959	✅ / ✅	✅ / ✅
future-genetic	25	✅ / ✅	✅ / ✅	1 / 1	2855 / 2852	✅ / ✅	✅ / ✅
naive-bayes	21	✅ / ✅	✅ / ✅	4 / 2	3466 / 3494	✅ / ✅	✅ / ✅
naive-bayes	25	✅ / ✅	✅ / ✅	5 / 6	3466 / 3473	✅ / ✅	✅ / ✅
reactors	21	✅ / ✅	✅ / ✅	✅ / 2	1660 / 1623	✅ / ✅	✅ / ✅
reactors	25	✅ / ✅	✅ / ✅	✅ / ✅	1789 / 1796	✅ / ✅	✅ / ✅

dd-octo-sts · 2026-08-16T18:38:31Z

✅ All 40 integration tests passed

📊 Dashboard · 👷 Pipeline · 📦 2a6d2d8e

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chatgpt-codex-connector · 2026-08-17T14:30:14Z

+  if (!slot->unownedBlockedFallbackEnabled()) {
    return result;
  }


Avoid dropping JVMTI unowned-block tail weight

When jvmtistacks=true, this guard now enables the weighted unowned-block fallback even though the delegated engine has no call_trace_id for replay. If an unowned blocked run ends after the first recorded signal but before the tenth, flushUnownedBlockedTail() consumes the suppressed weight on the runnable signal, while WallClockJvmti::signalHandler never calls emitUnownedBlockedTailForWallPrecheck; those suppressed intervals therefore disappear instead of contributing to the recorded weight. Keep ordinary per-signal sampling for this engine or provide a delegated tail-emission mechanism.

Useful? React with 👍 / 👎.

true, but let's keep it that way for now.

jbachorik

🗿 🤖 🔴

Sphinx Review found 1 critical/high severity finding(s) that must be addressed.

jbachorik

🗿 🤖 🔴

Sphinx Review found 1 critical/high severity finding(s) that must be addressed.

…-block tracking

kaahos force-pushed the paul.fournillon/taskblock-core branch 2 times, most recently from ad202a1 to 44a17e3 Compare July 16, 2026 15:18

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Comment thread ddprof-lib/src/main/cpp/taskBlockRecorder.cpp

Comment thread ddprof-lib/src/main/cpp/threadFilter.cpp

Comment thread ddprof-lib/src/main/cpp/threadFilter.h Outdated

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kaahos force-pushed the paul.fournillon/taskblock-core branch 4 times, most recently from c632b1f to 52e9497 Compare August 21, 2026 14:17

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kaahos force-pushed the paul.fournillon/taskblock-core branch from 669f541 to 37c62b8 Compare October 20, 2026 21:41

kaahos added 5 commits October 21, 2026 14:53

feat(wallclock): add paired TaskBlock API with generation-based owned…

afdb48e

…-block tracking

fix: reset TaskBlock state when returning a thread object to the pool

940d2e0

test: assert weighted coverage for unowned wall-clock sleeps

6c2846e

fix: preserve unowned wall-tail traces across JFR dumps

74a55d5

perf: add benchmark for unowned wall-tail recording

1690e26

kaahos force-pushed the paul.fournillon/taskblock-core branch 2 times, most recently from 6428b35 to 7e21c43 Compare October 21, 2026 15:48

fix: remove JVMTI unowned taskblock suppression

2a6d2d8

kaahos force-pushed the paul.fournillon/taskblock-core branch from 7e21c43 to 2a6d2d8 Compare October 21, 2026 16:34

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dd-octo-sts Bot commented Jul 21, 2026

Benchmark Results (commit ebab4c4)

⚠️ Significant outliers

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dd-octo-sts Bot commented Jul 21, 2026

Benchmark Results (commit 19cbe47)

⚠️ Significant outliers

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dd-octo-sts Bot commented Aug 16, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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💡 Codex Review

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chatgpt-codex-connector Bot Aug 17, 2026

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3 participants

kaahos commented Jul 16, 2026 •

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dd-octo-sts Bot commented Jul 16, 2026 •

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dd-octo-sts Bot commented Jul 16, 2026 •

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datadog-datadog-prod-us1 Bot commented Jul 16, 2026 •

edited by datadog-prod-us1-6 Bot

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Benchmark Results (commit `ebab4c4`)

Benchmark Results (commit `19cbe47`)

dd-octo-sts Bot commented Aug 16, 2026 •

edited

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