chore(heap-profiling): remove `free` USDT when live-heap is not available [PROF-15190] by scottgerring · Pull Request #2225 · DataDog/libdatadog

scottgerring · 2026-07-10T13:28:50Z

What does this PR do?

When the user does not opt into the live-heap feature, we should not emit the free USDT. This lets an attached profiler know that live heap is not available, making its life easier (e.g., it knows not to track sampled allocations).

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

How to test the change?

Describe here in detail how the change can be validated.

datadog-datadog-prod-us1-2 · 2026-07-10T13:46:48Z

Tests

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 58.33%
• Overall Coverage: 74.41% (-0.06%)

_{This comment will be updated automatically if new data arrives.

🔗 Commit SHA: b92fc02 | Docs | Datadog PR Page | Give us feedback!}

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Copilot

Pull request overview

Adjusts the heap-sampler USDT probe emission so external profilers can detect whether “live-heap” correlation is supported by checking for the presence/absence of the ddheap:free USDT note.

Changes:

Gate ddheap:free USDT emission behind DD_HEAP_LIVE_TRACKING in dd_probe_free.
Stop calling dd_probe_free on the sampled-free slow path when live-heap tracking is disabled.
Document that the dd_probe_free symbol always exists, but the USDT note is only present with live-heap tracking enabled.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
libdd-profiling-heap-sampler/src/probes.c	Conditionally emits the `ddheap:free` USDT based on `DD_HEAP_LIVE_TRACKING`.
libdd-profiling-heap-sampler/src/allocation_freed.c	Skips firing the free probe when live-heap tracking is disabled.
libdd-profiling-heap-sampler/include/datadog/heap/probes.h	Clarifies probe behavior and how external profilers can infer live-heap support.

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pr-commenter · 2026-07-10T15:02:31Z

Benchmarks

Comparison

Benchmark execution time: 2026-07-15 11:05:32

Comparing candidate commit b92fc02 in PR branch sgg/no-live-heap-no-probe with baseline commit a10f667 in branch main.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 39 metrics, 0 unstable metrics.

Explanation

This is an A/B test comparing a candidate commit's performance against that of a baseline commit. Performance changes are noted in the tables below as:

🟩 = significantly better candidate vs. baseline
🟥 = significantly worse candidate vs. baseline

We compute a confidence interval (CI) over the relative difference of means between metrics from the candidate and baseline commits, considering the baseline as the reference.

If the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD), the change is considered significant.

Feel free to reach out to #apm-benchmarking-platform on Slack if you have any questions.

More details about the CI and significant changes

You can imagine this CI as a range of values that is likely to contain the true difference of means between the candidate and baseline commits.

CIs of the difference of means are often centered around 0%, because often changes are not that big:

---------------------------------(------|---^--------)-------------------------------->
                              -0.6%    0%  0.3%     +1.2%
                                 |          |        |
         lower bound of the CI --'          |        |
sample mean (center of the CI) -------------'        |
         upper bound of the CI ----------------------'

As described above, a change is considered significant if the CI is entirely outside the configured SIGNIFICANT_IMPACT_THRESHOLD (or the deprecated UNCONFIDENCE_THRESHOLD).

For instance, for an execution time metric, this confidence interval indicates a significantly worse performance:

----------------------------------------|---------|---(---------^---------)---------->
                                       0%        1%  1.3%      2.2%      3.1%
                                                  |   |         |         |
       significant impact threshold --------------'   |         |         |
                      lower bound of CI --------------'         |         |
       sample mean (center of the CI) --------------------------'         |
                      upper bound of CI ----------------------------------'

scenario:alloc_free/sampled_system_fast_path/4096

🟩 execution_time [-12.826ns; -12.654ns] or [-11.015%; -10.868%]

Candidate

Candidate benchmark details

Group 1

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`b92fc02`	1784112644	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_system_slow_path/16	execution_time	88.818ns	89.446ns ± 0.102ns	89.447ns ± 0.032ns	89.478ns	89.557ns	89.749ns	90.175ns	0.81%	0.699	19.547	0.11%	0.007ns	1	200
alloc_free/sampled_system_slow_path/256	execution_time	89.202ns	89.693ns ± 0.115ns	89.684ns ± 0.034ns	89.717ns	89.788ns	90.120ns	90.715ns	1.15%	3.523	33.278	0.13%	0.008ns	1	200
alloc_free/sampled_system_slow_path/4096	execution_time	155.297ns	156.544ns ± 0.342ns	156.541ns ± 0.141ns	156.668ns	156.970ns	157.811ns	158.903ns	1.51%	1.919	12.878	0.22%	0.024ns	1	200
alloc_free/sampled_system_slow_path/64	execution_time	89.552ns	89.713ns ± 0.099ns	89.695ns ± 0.037ns	89.734ns	89.851ns	90.027ns	90.579ns	0.99%	4.277	30.441	0.11%	0.007ns	1	200
alloc_free/sampled_system_slow_path/65536	execution_time	154.294ns	155.850ns ± 0.262ns	155.858ns ± 0.119ns	155.972ns	156.216ns	156.436ns	156.886ns	0.66%	-1.383	10.199	0.17%	0.019ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_system_slow_path/16	execution_time	[89.432ns; 89.460ns] or [-0.016%; +0.016%]	None	None	None
alloc_free/sampled_system_slow_path/256	execution_time	[89.677ns; 89.709ns] or [-0.018%; +0.018%]	None	None	None
alloc_free/sampled_system_slow_path/4096	execution_time	[156.497ns; 156.591ns] or [-0.030%; +0.030%]	None	None	None
alloc_free/sampled_system_slow_path/64	execution_time	[89.699ns; 89.727ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/sampled_system_slow_path/65536	execution_time	[155.814ns; 155.887ns] or [-0.023%; +0.023%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`b92fc02`	1784112644	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
sampler_only/slow_path/16	execution_time	61.910ns	62.274ns ± 0.080ns	62.271ns ± 0.023ns	62.293ns	62.352ns	62.469ns	63.071ns	1.28%	4.662	50.579	0.13%	0.006ns	1	200
sampler_only/slow_path/256	execution_time	61.980ns	62.284ns ± 0.055ns	62.281ns ± 0.021ns	62.305ns	62.359ns	62.455ns	62.476ns	0.31%	-0.723	8.087	0.09%	0.004ns	1	200
sampler_only/slow_path/4096	execution_time	62.227ns	62.499ns ± 0.084ns	62.490ns ± 0.022ns	62.516ns	62.572ns	62.657ns	63.427ns	1.50%	6.707	74.893	0.13%	0.006ns	1	200
sampler_only/slow_path/64	execution_time	61.916ns	62.274ns ± 0.073ns	62.269ns ± 0.024ns	62.294ns	62.347ns	62.488ns	62.884ns	0.99%	2.308	28.560	0.12%	0.005ns	1	200
sampler_only/slow_path/65536	execution_time	66.273ns	66.814ns ± 0.089ns	66.810ns ± 0.027ns	66.838ns	66.904ns	66.982ns	67.443ns	0.95%	1.918	25.744	0.13%	0.006ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
sampler_only/slow_path/16	execution_time	[62.263ns; 62.285ns] or [-0.018%; +0.018%]	None	None	None
sampler_only/slow_path/256	execution_time	[62.276ns; 62.291ns] or [-0.012%; +0.012%]	None	None	None
sampler_only/slow_path/4096	execution_time	[62.487ns; 62.511ns] or [-0.019%; +0.019%]	None	None	None
sampler_only/slow_path/64	execution_time	[62.264ns; 62.284ns] or [-0.016%; +0.016%]	None	None	None
sampler_only/slow_path/65536	execution_time	[66.802ns; 66.826ns] or [-0.018%; +0.018%]	None	None	None

Group 3

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`b92fc02`	1784112644	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/system/16	execution_time	14.001ns	14.292ns ± 0.091ns	14.291ns ± 0.051ns	14.341ns	14.429ns	14.533ns	14.618ns	2.29%	0.049	1.741	0.64%	0.006ns	1	200
alloc_free/system/256	execution_time	14.111ns	14.312ns ± 0.086ns	14.306ns ± 0.050ns	14.351ns	14.452ns	14.638ns	14.721ns	2.90%	1.346	4.017	0.60%	0.006ns	1	200
alloc_free/system/4096	execution_time	81.222ns	81.795ns ± 0.161ns	81.765ns ± 0.072ns	81.850ns	82.071ns	82.325ns	82.692ns	1.13%	1.575	6.276	0.20%	0.011ns	1	200
alloc_free/system/64	execution_time	14.002ns	14.302ns ± 0.090ns	14.294ns ± 0.045ns	14.342ns	14.439ns	14.573ns	14.753ns	3.21%	0.822	4.340	0.63%	0.006ns	1	200
alloc_free/system/65536	execution_time	87.502ns	88.424ns ± 0.221ns	88.415ns ± 0.097ns	88.515ns	88.698ns	89.105ns	89.444ns	1.16%	0.398	6.334	0.25%	0.016ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/system/16	execution_time	[14.279ns; 14.305ns] or [-0.088%; +0.088%]	None	None	None
alloc_free/system/256	execution_time	[14.300ns; 14.324ns] or [-0.084%; +0.084%]	None	None	None
alloc_free/system/4096	execution_time	[81.773ns; 81.817ns] or [-0.027%; +0.027%]	None	None	None
alloc_free/system/64	execution_time	[14.290ns; 14.315ns] or [-0.087%; +0.087%]	None	None	None
alloc_free/system/65536	execution_time	[88.394ns; 88.455ns] or [-0.035%; +0.035%]	None	None	None

Group 4

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`b92fc02`	1784112644	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/noop/16	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.403ns	0.406ns	1.06%	3.598	41.673	0.11%	0.000ns	1	200
alloc_free/noop/256	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.403ns	0.409ns	1.74%	7.832	88.796	0.15%	0.000ns	1	200
alloc_free/noop/4096	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.404ns	0.408ns	1.61%	6.518	59.663	0.16%	0.000ns	1	200
alloc_free/noop/64	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.403ns	0.404ns	0.38%	0.359	8.494	0.08%	0.000ns	1	200
alloc_free/noop/65536	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.403ns	0.404ns	0.52%	-0.414	12.576	0.09%	0.000ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/noop/16	execution_time	[0.402ns; 0.402ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/noop/256	execution_time	[0.402ns; 0.402ns] or [-0.021%; +0.021%]	None	None	None
alloc_free/noop/4096	execution_time	[0.402ns; 0.402ns] or [-0.022%; +0.022%]	None	None	None
alloc_free/noop/64	execution_time	[0.402ns; 0.402ns] or [-0.011%; +0.011%]	None	None	None
alloc_free/noop/65536	execution_time	[0.402ns; 0.402ns] or [-0.012%; +0.012%]	None	None	None

Group 5

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`b92fc02`	1784112644	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_noop_slow_path/16	execution_time	63.595ns	63.926ns ± 0.048ns	63.927ns ± 0.019ns	63.947ns	63.986ns	64.041ns	64.091ns	0.26%	-1.676	12.443	0.07%	0.003ns	1	200
alloc_free/sampled_noop_slow_path/256	execution_time	63.780ns	64.084ns ± 0.075ns	64.078ns ± 0.024ns	64.107ns	64.168ns	64.258ns	64.801ns	1.13%	4.056	42.254	0.12%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/4096	execution_time	64.105ns	64.453ns ± 0.090ns	64.443ns ± 0.023ns	64.465ns	64.554ns	64.714ns	65.336ns	1.38%	5.272	47.923	0.14%	0.006ns	1	200
alloc_free/sampled_noop_slow_path/64	execution_time	63.791ns	64.072ns ± 0.065ns	64.065ns ± 0.022ns	64.089ns	64.139ns	64.266ns	64.691ns	0.98%	4.264	41.496	0.10%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/65536	execution_time	68.332ns	68.641ns ± 0.065ns	68.642ns ± 0.032ns	68.675ns	68.734ns	68.811ns	68.931ns	0.42%	-0.154	4.701	0.09%	0.005ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_noop_slow_path/16	execution_time	[63.919ns; 63.933ns] or [-0.010%; +0.010%]	None	None	None
alloc_free/sampled_noop_slow_path/256	execution_time	[64.074ns; 64.095ns] or [-0.016%; +0.016%]	None	None	None
alloc_free/sampled_noop_slow_path/4096	execution_time	[64.441ns; 64.466ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/sampled_noop_slow_path/64	execution_time	[64.063ns; 64.081ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_slow_path/65536	execution_time	[68.632ns; 68.650ns] or [-0.013%; +0.013%]	None	None	None

Group 6

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`b92fc02`	1784112644	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
sampler_only/fast_path/16	execution_time	13.604ns	13.670ns ± 0.014ns	13.668ns ± 0.005ns	13.675ns	13.688ns	13.718ns	13.773ns	0.76%	2.274	18.427	0.10%	0.001ns	1	200
sampler_only/fast_path/256	execution_time	13.605ns	13.671ns ± 0.014ns	13.671ns ± 0.005ns	13.676ns	13.686ns	13.710ns	13.779ns	0.79%	2.177	21.378	0.10%	0.001ns	1	200
sampler_only/fast_path/4096	execution_time	13.601ns	13.669ns ± 0.013ns	13.669ns ± 0.005ns	13.674ns	13.684ns	13.704ns	13.759ns	0.65%	0.523	17.387	0.09%	0.001ns	1	200
sampler_only/fast_path/64	execution_time	13.604ns	13.669ns ± 0.013ns	13.669ns ± 0.005ns	13.674ns	13.686ns	13.717ns	13.722ns	0.39%	0.225	6.233	0.09%	0.001ns	1	200
sampler_only/fast_path/65536	execution_time	13.601ns	13.672ns ± 0.018ns	13.670ns ± 0.005ns	13.675ns	13.691ns	13.738ns	13.837ns	1.22%	4.607	40.993	0.13%	0.001ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
sampler_only/fast_path/16	execution_time	[13.668ns; 13.672ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/fast_path/256	execution_time	[13.669ns; 13.673ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/fast_path/4096	execution_time	[13.668ns; 13.671ns] or [-0.013%; +0.013%]	None	None	None
sampler_only/fast_path/64	execution_time	[13.668ns; 13.671ns] or [-0.013%; +0.013%]	None	None	None
sampler_only/fast_path/65536	execution_time	[13.669ns; 13.674ns] or [-0.018%; +0.018%]	None	None	None

Group 7

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`b92fc02`	1784112644	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_noop_fast_path/16	execution_time	14.801ns	14.875ns ± 0.015ns	14.874ns ± 0.005ns	14.880ns	14.893ns	14.921ns	14.962ns	0.59%	0.761	13.523	0.10%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/256	execution_time	14.801ns	14.876ns ± 0.016ns	14.874ns ± 0.005ns	14.880ns	14.891ns	14.903ns	15.034ns	1.07%	3.831	45.052	0.11%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/4096	execution_time	14.803ns	14.877ns ± 0.013ns	14.876ns ± 0.005ns	14.882ns	14.893ns	14.911ns	14.962ns	0.58%	1.297	17.473	0.08%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/64	execution_time	14.802ns	14.876ns ± 0.016ns	14.876ns ± 0.007ns	14.882ns	14.895ns	14.920ns	14.998ns	0.82%	1.562	20.332	0.11%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/65536	execution_time	14.801ns	14.876ns ± 0.019ns	14.875ns ± 0.005ns	14.879ns	14.896ns	14.924ns	15.078ns	1.37%	5.881	63.493	0.13%	0.001ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_noop_fast_path/16	execution_time	[14.873ns; 14.877ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_fast_path/256	execution_time	[14.873ns; 14.878ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/sampled_noop_fast_path/4096	execution_time	[14.875ns; 14.879ns] or [-0.012%; +0.012%]	None	None	None
alloc_free/sampled_noop_fast_path/64	execution_time	[14.874ns; 14.878ns] or [-0.015%; +0.015%]	None	None	None
alloc_free/sampled_noop_fast_path/65536	execution_time	[14.873ns; 14.879ns] or [-0.018%; +0.018%]	None	None	None

Group 8

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`b92fc02`	1784112644	sgg/no-live-heap-no-probe

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_system_fast_path/16	execution_time	25.941ns	26.225ns ± 0.069ns	26.222ns ± 0.036ns	26.257ns	26.328ns	26.409ns	26.592ns	1.41%	0.634	5.302	0.26%	0.005ns	1	200
alloc_free/sampled_system_fast_path/256	execution_time	25.902ns	26.205ns ± 0.076ns	26.202ns ± 0.035ns	26.236ns	26.331ns	26.419ns	26.546ns	1.31%	0.575	4.349	0.29%	0.005ns	1	200
alloc_free/sampled_system_fast_path/4096	execution_time	102.029ns	103.699ns ± 0.444ns	103.688ns ± 0.250ns	103.929ns	104.374ns	104.554ns	105.878ns	2.11%	0.157	3.669	0.43%	0.031ns	1	200
alloc_free/sampled_system_fast_path/64	execution_time	25.981ns	26.230ns ± 0.068ns	26.223ns ± 0.031ns	26.257ns	26.320ns	26.410ns	26.680ns	1.74%	1.893	11.670	0.26%	0.005ns	1	200
alloc_free/sampled_system_fast_path/65536	execution_time	98.479ns	100.102ns ± 0.326ns	100.117ns ± 0.155ns	100.259ns	100.528ns	101.100ns	101.197ns	1.08%	-0.697	4.703	0.33%	0.023ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_system_fast_path/16	execution_time	[26.215ns; 26.234ns] or [-0.036%; +0.036%]	None	None	None
alloc_free/sampled_system_fast_path/256	execution_time	[26.194ns; 26.215ns] or [-0.040%; +0.040%]	None	None	None
alloc_free/sampled_system_fast_path/4096	execution_time	[103.637ns; 103.760ns] or [-0.059%; +0.059%]	None	None	None
alloc_free/sampled_system_fast_path/64	execution_time	[26.221ns; 26.239ns] or [-0.036%; +0.036%]	None	None	None
alloc_free/sampled_system_fast_path/65536	execution_time	[100.057ns; 100.147ns] or [-0.045%; +0.045%]	None	None	None

Baseline

Baseline benchmark details

Group 1

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`a10f667`	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_system_slow_path/16	execution_time	89.590ns	89.985ns ± 0.119ns	89.975ns ± 0.032ns	90.013ns	90.102ns	90.365ns	91.102ns	1.25%	4.809	41.606	0.13%	0.008ns	1	200
alloc_free/sampled_system_slow_path/256	execution_time	88.943ns	89.360ns ± 0.084ns	89.358ns ± 0.033ns	89.392ns	89.449ns	89.656ns	89.913ns	0.62%	1.160	14.533	0.09%	0.006ns	1	200
alloc_free/sampled_system_slow_path/4096	execution_time	155.147ns	156.681ns ± 0.354ns	156.657ns ± 0.163ns	156.847ns	157.103ns	157.614ns	158.856ns	1.40%	0.626	8.947	0.23%	0.025ns	1	200
alloc_free/sampled_system_slow_path/64	execution_time	88.845ns	89.344ns ± 0.116ns	89.333ns ± 0.037ns	89.374ns	89.470ns	89.675ns	90.490ns	1.30%	4.700	47.591	0.13%	0.008ns	1	200
alloc_free/sampled_system_slow_path/65536	execution_time	155.441ns	156.221ns ± 0.366ns	156.177ns ± 0.095ns	156.271ns	156.625ns	157.459ns	159.764ns	2.30%	5.478	46.196	0.23%	0.026ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_system_slow_path/16	execution_time	[89.968ns; 90.001ns] or [-0.018%; +0.018%]	None	None	None
alloc_free/sampled_system_slow_path/256	execution_time	[89.348ns; 89.372ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_system_slow_path/4096	execution_time	[156.632ns; 156.730ns] or [-0.031%; +0.031%]	None	None	None
alloc_free/sampled_system_slow_path/64	execution_time	[89.328ns; 89.360ns] or [-0.018%; +0.018%]	None	None	None
alloc_free/sampled_system_slow_path/65536	execution_time	[156.171ns; 156.272ns] or [-0.032%; +0.032%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`a10f667`	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
sampler_only/slow_path/16	execution_time	61.920ns	62.311ns ± 0.113ns	62.300ns ± 0.024ns	62.324ns	62.387ns	62.616ns	63.303ns	1.61%	6.209	52.837	0.18%	0.008ns	1	200
sampler_only/slow_path/256	execution_time	61.791ns	62.183ns ± 0.070ns	62.179ns ± 0.022ns	62.203ns	62.270ns	62.461ns	62.618ns	0.70%	1.527	16.938	0.11%	0.005ns	1	200
sampler_only/slow_path/4096	execution_time	62.282ns	62.684ns ± 0.069ns	62.679ns ± 0.026ns	62.707ns	62.776ns	62.985ns	63.040ns	0.58%	0.426	13.248	0.11%	0.005ns	1	200
sampler_only/slow_path/64	execution_time	62.031ns	62.300ns ± 0.051ns	62.301ns ± 0.020ns	62.320ns	62.375ns	62.418ns	62.594ns	0.47%	-0.106	9.683	0.08%	0.004ns	1	200
sampler_only/slow_path/65536	execution_time	66.503ns	66.859ns ± 0.070ns	66.859ns ± 0.029ns	66.890ns	66.951ns	67.082ns	67.151ns	0.44%	-0.388	6.414	0.10%	0.005ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
sampler_only/slow_path/16	execution_time	[62.295ns; 62.327ns] or [-0.025%; +0.025%]	None	None	None
sampler_only/slow_path/256	execution_time	[62.174ns; 62.193ns] or [-0.016%; +0.016%]	None	None	None
sampler_only/slow_path/4096	execution_time	[62.675ns; 62.694ns] or [-0.015%; +0.015%]	None	None	None
sampler_only/slow_path/64	execution_time	[62.293ns; 62.308ns] or [-0.011%; +0.011%]	None	None	None
sampler_only/slow_path/65536	execution_time	[66.849ns; 66.869ns] or [-0.014%; +0.014%]	None	None	None

Group 3

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`a10f667`	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/system/16	execution_time	14.077ns	14.305ns ± 0.080ns	14.295ns ± 0.047ns	14.347ns	14.467ns	14.538ns	14.613ns	2.22%	0.597	1.290	0.56%	0.006ns	1	200
alloc_free/system/256	execution_time	14.031ns	14.297ns ± 0.083ns	14.295ns ± 0.053ns	14.357ns	14.434ns	14.490ns	14.538ns	1.70%	-0.183	0.499	0.58%	0.006ns	1	200
alloc_free/system/4096	execution_time	81.759ns	82.643ns ± 0.246ns	82.635ns ± 0.122ns	82.765ns	83.005ns	83.381ns	83.766ns	1.37%	0.118	3.172	0.30%	0.017ns	1	200
alloc_free/system/64	execution_time	14.001ns	14.306ns ± 0.091ns	14.299ns ± 0.044ns	14.350ns	14.448ns	14.566ns	14.710ns	2.87%	0.518	3.217	0.63%	0.006ns	1	200
alloc_free/system/65536	execution_time	87.679ns	88.480ns ± 0.932ns	88.398ns ± 0.103ns	88.499ns	88.803ns	88.921ns	101.328ns	14.63%	13.191	179.383	1.05%	0.066ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/system/16	execution_time	[14.294ns; 14.317ns] or [-0.078%; +0.078%]	None	None	None
alloc_free/system/256	execution_time	[14.286ns; 14.309ns] or [-0.081%; +0.081%]	None	None	None
alloc_free/system/4096	execution_time	[82.609ns; 82.677ns] or [-0.041%; +0.041%]	None	None	None
alloc_free/system/64	execution_time	[14.293ns; 14.318ns] or [-0.088%; +0.088%]	None	None	None
alloc_free/system/65536	execution_time	[88.350ns; 88.609ns] or [-0.146%; +0.146%]	None	None	None

Group 4

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`a10f667`	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/noop/16	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.407ns	1.34%	5.400	49.899	0.13%	0.000ns	1	200
alloc_free/noop/256	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.409ns	1.66%	6.742	63.945	0.16%	0.000ns	1	200
alloc_free/noop/4096	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.403ns	0.405ns	0.84%	3.749	31.079	0.10%	0.000ns	1	200
alloc_free/noop/64	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.408ns	1.50%	6.094	53.277	0.15%	0.000ns	1	200
alloc_free/noop/65536	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.404ns	0.409ns	1.66%	6.732	64.002	0.16%	0.000ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/noop/16	execution_time	[0.402ns; 0.402ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/noop/256	execution_time	[0.402ns; 0.402ns] or [-0.022%; +0.022%]	None	None	None
alloc_free/noop/4096	execution_time	[0.402ns; 0.402ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/noop/64	execution_time	[0.402ns; 0.402ns] or [-0.021%; +0.021%]	None	None	None
alloc_free/noop/65536	execution_time	[0.402ns; 0.402ns] or [-0.022%; +0.022%]	None	None	None

Group 5

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`a10f667`	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_noop_slow_path/16	execution_time	63.742ns	64.025ns ± 0.066ns	64.025ns ± 0.025ns	64.050ns	64.103ns	64.247ns	64.384ns	0.56%	1.083	10.261	0.10%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/256	execution_time	63.694ns	64.058ns ± 0.117ns	64.048ns ± 0.024ns	64.074ns	64.120ns	64.260ns	65.426ns	2.15%	8.436	94.372	0.18%	0.008ns	1	200
alloc_free/sampled_noop_slow_path/4096	execution_time	64.197ns	64.408ns ± 0.064ns	64.402ns ± 0.028ns	64.431ns	64.498ns	64.595ns	64.887ns	0.75%	2.182	15.654	0.10%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/64	execution_time	63.707ns	64.031ns ± 0.062ns	64.031ns ± 0.026ns	64.059ns	64.116ns	64.178ns	64.318ns	0.45%	-0.392	6.987	0.10%	0.004ns	1	200
alloc_free/sampled_noop_slow_path/65536	execution_time	68.331ns	68.611ns ± 0.072ns	68.603ns ± 0.027ns	68.632ns	68.725ns	68.850ns	69.048ns	0.65%	1.574	9.088	0.10%	0.005ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_noop_slow_path/16	execution_time	[64.016ns; 64.034ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_slow_path/256	execution_time	[64.042ns; 64.074ns] or [-0.025%; +0.025%]	None	None	None
alloc_free/sampled_noop_slow_path/4096	execution_time	[64.400ns; 64.417ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_slow_path/64	execution_time	[64.022ns; 64.040ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_noop_slow_path/65536	execution_time	[68.601ns; 68.621ns] or [-0.015%; +0.015%]	None	None	None

Group 6

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`a10f667`	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
sampler_only/fast_path/16	execution_time	14.003ns	14.073ns ± 0.021ns	14.072ns ± 0.005ns	14.077ns	14.094ns	14.120ns	14.317ns	1.74%	7.386	83.486	0.15%	0.002ns	1	200
sampler_only/fast_path/256	execution_time	14.002ns	14.072ns ± 0.015ns	14.071ns ± 0.005ns	14.076ns	14.093ns	14.111ns	14.188ns	0.83%	1.607	19.735	0.11%	0.001ns	1	200
sampler_only/fast_path/4096	execution_time	14.007ns	14.072ns ± 0.014ns	14.071ns ± 0.005ns	14.076ns	14.087ns	14.127ns	14.169ns	0.69%	2.030	14.426	0.10%	0.001ns	1	200
sampler_only/fast_path/64	execution_time	14.001ns	14.077ns ± 0.031ns	14.074ns ± 0.006ns	14.080ns	14.090ns	14.141ns	14.413ns	2.41%	8.095	78.734	0.22%	0.002ns	1	200
sampler_only/fast_path/65536	execution_time	14.005ns	14.074ns ± 0.021ns	14.072ns ± 0.005ns	14.077ns	14.090ns	14.134ns	14.294ns	1.57%	6.168	60.603	0.15%	0.001ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
sampler_only/fast_path/16	execution_time	[14.070ns; 14.076ns] or [-0.021%; +0.021%]	None	None	None
sampler_only/fast_path/256	execution_time	[14.070ns; 14.074ns] or [-0.015%; +0.015%]	None	None	None
sampler_only/fast_path/4096	execution_time	[14.070ns; 14.074ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/fast_path/64	execution_time	[14.073ns; 14.081ns] or [-0.031%; +0.031%]	None	None	None
sampler_only/fast_path/65536	execution_time	[14.071ns; 14.077ns] or [-0.021%; +0.021%]	None	None	None

Group 7

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`a10f667`	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_noop_fast_path/16	execution_time	14.402ns	14.477ns ± 0.051ns	14.473ns ± 0.005ns	14.479ns	14.496ns	14.509ns	15.161ns	4.75%	12.342	164.091	0.35%	0.004ns	1	200
alloc_free/sampled_noop_fast_path/256	execution_time	14.401ns	14.474ns ± 0.014ns	14.473ns ± 0.005ns	14.479ns	14.489ns	14.522ns	14.568ns	0.66%	0.761	15.832	0.10%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/4096	execution_time	14.401ns	14.476ns ± 0.022ns	14.473ns ± 0.005ns	14.479ns	14.493ns	14.538ns	14.663ns	1.31%	5.471	44.042	0.15%	0.002ns	1	200
alloc_free/sampled_noop_fast_path/64	execution_time	14.402ns	14.475ns ± 0.019ns	14.473ns ± 0.004ns	14.477ns	14.490ns	14.536ns	14.672ns	1.38%	6.024	61.867	0.13%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/65536	execution_time	14.401ns	14.476ns ± 0.020ns	14.475ns ± 0.005ns	14.480ns	14.494ns	14.526ns	14.648ns	1.20%	4.143	34.383	0.14%	0.001ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_noop_fast_path/16	execution_time	[14.470ns; 14.484ns] or [-0.049%; +0.049%]	None	None	None
alloc_free/sampled_noop_fast_path/256	execution_time	[14.472ns; 14.476ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_fast_path/4096	execution_time	[14.472ns; 14.479ns] or [-0.021%; +0.021%]	None	None	None
alloc_free/sampled_noop_fast_path/64	execution_time	[14.472ns; 14.477ns] or [-0.018%; +0.018%]	None	None	None
alloc_free/sampled_noop_fast_path/65536	execution_time	[14.473ns; 14.478ns] or [-0.019%; +0.019%]	None	None	None

Group 8

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	`a10f667`	1784074032	main

scenario	metric	min	mean ± sd	median ± mad	p75	p95	p99	max	peak_to_median_ratio	skewness	kurtosis	cv	sem	runs	sample_size
alloc_free/sampled_system_fast_path/16	execution_time	26.009ns	26.225ns ± 0.082ns	26.217ns ± 0.040ns	26.258ns	26.332ns	26.510ns	26.772ns	2.12%	1.923	10.951	0.31%	0.006ns	1	200
alloc_free/sampled_system_fast_path/256	execution_time	25.911ns	26.217ns ± 0.076ns	26.212ns ± 0.040ns	26.254ns	26.337ns	26.428ns	26.661ns	1.71%	0.755	6.636	0.29%	0.005ns	1	200
alloc_free/sampled_system_fast_path/4096	execution_time	114.786ns	116.439ns ± 0.430ns	116.455ns ± 0.190ns	116.631ns	116.952ns	117.217ns	119.686ns	2.78%	1.587	16.899	0.37%	0.030ns	1	200
alloc_free/sampled_system_fast_path/64	execution_time	25.945ns	26.203ns ± 0.064ns	26.201ns ± 0.034ns	26.239ns	26.308ns	26.370ns	26.406ns	0.78%	-0.334	2.225	0.24%	0.005ns	1	200
alloc_free/sampled_system_fast_path/65536	execution_time	98.597ns	100.012ns ± 0.301ns	100.003ns ± 0.165ns	100.213ns	100.439ns	100.705ns	100.924ns	0.92%	-0.702	2.756	0.30%	0.021ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/sampled_system_fast_path/16	execution_time	[26.213ns; 26.236ns] or [-0.043%; +0.043%]	None	None	None
alloc_free/sampled_system_fast_path/256	execution_time	[26.206ns; 26.227ns] or [-0.040%; +0.040%]	None	None	None
alloc_free/sampled_system_fast_path/4096	execution_time	[116.379ns; 116.498ns] or [-0.051%; +0.051%]	None	None	None
alloc_free/sampled_system_fast_path/64	execution_time	[26.194ns; 26.212ns] or [-0.034%; +0.034%]	None	None	None
alloc_free/sampled_system_fast_path/65536	execution_time	[99.970ns; 100.053ns] or [-0.042%; +0.042%]	None	None	None

dd-octo-sts · 2026-07-10T15:25:17Z

Artifact Size Benchmark Report

aarch64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.so	7.88 MB	7.88 MB	0% (0 B) 👌
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.a	86.32 MB	86.32 MB	0% (0 B) 👌

aarch64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.a	97.54 MB	97.54 MB	0% (0 B) 👌
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.so	10.62 MB	10.62 MB	0% (0 B) 👌

libdatadog-x64-windows

Artifact	Baseline	Commit	Change

libdatadog-x86-windows

Artifact	Baseline	Commit	Change

x86_64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.a	77.09 MB	77.09 MB	0% (0 B) 👌
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.so	8.83 MB	8.83 MB	0% (0 B) 👌

x86_64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.a	92.50 MB	92.50 MB	0% (0 B) 👌
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.so	10.74 MB	10.74 MB	0% (0 B) 👌

…e USDT does not land in the process

…ing emitted

scottgerring · 2026-07-16T12:13:59Z

/merge

gh-worker-devflow-routing-ef8351 · 2026-07-16T12:14:03Z

View all feedbacks in Devflow UI.

2026-07-16 12:14:03 UTC ℹ️ Start processing command /merge

2026-07-16 12:14:09 UTC ℹ️ MergeQueue: pull request added to the queue

The expected merge time in main is approximately 1h (p90).

2026-07-16 12:57:10 UTC ℹ️ MergeQueue: This merge request was merged

scottgerring marked this pull request as ready for review July 10, 2026 13:54

scottgerring requested a review from a team as a code owner July 10, 2026 13:54

chatgpt-codex-connector Bot reviewed Jul 10, 2026

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Comment thread libdd-profiling-heap-sampler/src/probes.c Outdated

Comment thread libdd-profiling-heap-sampler/include/datadog/heap/probes.h Outdated

scottgerring marked this pull request as draft July 10, 2026 14:27

scottgerring requested a review from Copilot July 10, 2026 14:52

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Comment thread libdd-profiling-heap-sampler/src/probes.c

scottgerring force-pushed the sgg/no-live-heap-no-probe branch from c0ccf7c to 9f3653e Compare July 10, 2026 15:31

danielsn reviewed Jul 10, 2026

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Comment thread libdd-profiling-heap-sampler/src/allocation_freed.c

scottgerring requested a review from r1viollet July 14, 2026 06:18

scottgerring marked this pull request as ready for review July 15, 2026 06:12

scottgerring added 3 commits July 15, 2026 08:44

chore(heap-profiling): if a user doesnt opt into live heap, ensure th…

52e919e

…e USDT does not land in the process

address clanker review comments

4680d1d

add free path test

4556dad

scottgerring force-pushed the sgg/no-live-heap-no-probe branch from 2989b1b to 4556dad Compare July 15, 2026 06:47

test for free USDT being emitted need to be gated on the free USDT be…

b92fc02

…ing emitted

scottgerring force-pushed the sgg/no-live-heap-no-probe branch from 9099c32 to b92fc02 Compare July 15, 2026 10:50

nsavoire approved these changes Jul 16, 2026

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gh-worker-dd-devflow-36fce6 Bot added mergequeue-status: queued mergequeue-status: in_progress and removed mergequeue-status: queued labels Jul 16, 2026

gh-worker-dd-mergequeue-cf854d Bot merged commit 4ff5398 into main Jul 16, 2026
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gh-worker-dd-devflow-36fce6 Bot removed the mergequeue-status: in_progress label Jul 16, 2026

gh-worker-dd-mergequeue-cf854d Bot deleted the sgg/no-live-heap-no-probe branch July 16, 2026 12:57

gh-worker-dd-devflow-36fce6 Bot added the mergequeue-status: done label Jul 16, 2026

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scottgerring commented Jul 10, 2026

What does this PR do?

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scenario:alloc_free/sampled_system_fast_path/4096

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Artifact Size Benchmark Report

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scottgerring commented Jul 16, 2026

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datadog-datadog-prod-us1-2 Bot commented Jul 10, 2026 •

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