chore(profiling): allow user to customise default heap profiling sampling interval [PROF-15190]

[scottgerring]

What does this PR do?

Let's the user customise the sampling interval via either the gotter or allocator crates. This is done with a pair of free functions to reflect the lifecycle - i.e. this is a global change, and bolting it onto a field on e.g. the GlobalAllocator would feel weird.

Motivation

In the long term we're probably going to want to dynamically adjust the sampling interval so we can size it appropriately regardless of the workload's allocation patterns, but this is a bit more involved. In the short term, let's add a lever to override the default sampling interval. This will allow our users to set a workload-appropriate size by reflecting on allocation rate and desired sample count. For some of the sample workloads we have looked at so far we have seen allocation rate means above 40 MiB/s, which with a 512 KiB sample rate gives a sample every ~10ms, which is generally going to be too much.

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]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 0.00%
• Overall Coverage: 74.54% (-0.02%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: f3eae4a | Docs | Datadog PR Page | Give us feedback!}

[Copilot]

Pull request overview

This PR adds a process-wide mechanism to override the default heap-profiling mean sampling distance (bytes between samples), exposing it via Rust APIs in the heap sampler plus convenience passthroughs in the GOT interposer and allocator crates.

Changes:

• Introduce a global _Atomic uint64_t override and a C setter (dd_set_default_sampling_interval) used when initializing per-thread sampler state.
• Expose a Rust set_default_sampling_distance(u64) API in libdd-profiling-heap-sampler, and forward it from libdd-profiling-heap-gotter and libdd-profiling-heap-allocator (plus a C-ABI function in libdd-profiling-heap-gotter-ffi).
• Extend bindgen/static-wrapper generation to include the new API surface.

Reviewed changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
libdd-profiling-heap-sampler/src/tl_state.c	Adds a process-wide atomic override and setter; uses the effective interval when initializing TLS state.
libdd-profiling-heap-sampler/src/lib.rs	Adds a Rust API to set the default sampling distance (Linux-only).
libdd-profiling-heap-sampler/src/generated/dd_heap_sampler_static_wrappers.c	Adds a wrapper symbol for the dd_sampling_interval_effective() inline helper.
libdd-profiling-heap-sampler/src/generated/bindings.rs	Updates generated Rust FFI bindings to include the new C APIs/vars.
libdd-profiling-heap-sampler/include/datadog/heap/tl_state.h	Declares the override, setter, and an inline “effective interval” helper.
libdd-profiling-heap-sampler/build.rs	Updates bindgen allowlist to include the new global symbol.
libdd-profiling-heap-gotter/src/lib.rs	Adds a public forwarding API to set the default sampling distance (no-op on unsupported targets).
libdd-profiling-heap-gotter-ffi/src/lib.rs	Adds an exported C-ABI function to set the default sampling distance.
libdd-profiling-heap-allocator/src/lib.rs	Adds a public forwarding API and updates docs/example to show configuring the sampling distance.

---

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[pr-commenter]

Benchmarks

Comparison

Benchmark execution time: 2026-07-21 08:08:43

Comparing candidate commit f3eae4a in PR branch sgg/customise-default-sampling-interval with baseline commit fb65e46 in branch main.

Found 0 performance improvements and 1 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 [+12.603ns; +12.787ns] or [+12.151%; +12.328%]

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	f3eae4a	1784620355	sgg/customise-default-sampling-interval

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	13.603ns	13.666ns ± 0.012ns	13.665ns ± 0.004ns	13.669ns	13.685ns	13.712ns	13.733ns	0.50%	1.062	9.407	0.09%	0.001ns	1	200
sampler_only/fast_path/256	execution_time	13.606ns	13.667ns ± 0.012ns	13.666ns ± 0.005ns	13.672ns	13.683ns	13.711ns	13.735ns	0.51%	0.778	9.656	0.09%	0.001ns	1	200
sampler_only/fast_path/4096	execution_time	13.601ns	13.667ns ± 0.018ns	13.666ns ± 0.004ns	13.671ns	13.680ns	13.716ns	13.857ns	1.40%	6.358	68.454	0.13%	0.001ns	1	200
sampler_only/fast_path/64	execution_time	13.603ns	13.668ns ± 0.012ns	13.667ns ± 0.004ns	13.672ns	13.685ns	13.700ns	13.733ns	0.48%	-0.293	10.083	0.09%	0.001ns	1	200
sampler_only/fast_path/65536	execution_time	13.603ns	13.668ns ± 0.015ns	13.666ns ± 0.004ns	13.670ns	13.684ns	13.715ns	13.781ns	0.84%	2.394	22.788	0.11%	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	[13.664ns; 13.668ns] or [-0.012%; +0.012%]	None	None	None
sampler_only/fast_path/256	execution_time	[13.665ns; 13.669ns] or [-0.012%; +0.012%]	None	None	None
sampler_only/fast_path/4096	execution_time	[13.665ns; 13.670ns] or [-0.018%; +0.018%]	None	None	None
sampler_only/fast_path/64	execution_time	[13.666ns; 13.669ns] or [-0.012%; +0.012%]	None	None	None
sampler_only/fast_path/65536	execution_time	[13.666ns; 13.670ns] or [-0.015%; +0.015%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	f3eae4a	1784620355	sgg/customise-default-sampling-interval

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	14.403ns	14.470ns ± 0.012ns	14.471ns ± 0.005ns	14.475ns	14.489ns	14.499ns	14.515ns	0.31%	-1.302	10.372	0.08%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/256	execution_time	14.401ns	14.468ns ± 0.013ns	14.468ns ± 0.004ns	14.472ns	14.484ns	14.502ns	14.551ns	0.58%	0.108	16.189	0.09%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/4096	execution_time	14.402ns	14.472ns ± 0.013ns	14.471ns ± 0.005ns	14.477ns	14.492ns	14.514ns	14.559ns	0.61%	1.302	13.644	0.09%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/64	execution_time	14.404ns	14.470ns ± 0.020ns	14.469ns ± 0.006ns	14.476ns	14.487ns	14.502ns	14.699ns	1.59%	7.185	80.589	0.14%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/65536	execution_time	14.401ns	14.471ns ± 0.014ns	14.471ns ± 0.005ns	14.476ns	14.489ns	14.509ns	14.541ns	0.49%	0.106	10.456	0.10%	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	[14.469ns; 14.472ns] or [-0.011%; +0.011%]	None	None	None
alloc_free/sampled_noop_fast_path/256	execution_time	[14.467ns; 14.470ns] or [-0.012%; +0.012%]	None	None	None
alloc_free/sampled_noop_fast_path/4096	execution_time	[14.470ns; 14.474ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_noop_fast_path/64	execution_time	[14.467ns; 14.473ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/sampled_noop_fast_path/65536	execution_time	[14.469ns; 14.473ns] or [-0.013%; +0.013%]	None	None	None

Group 3

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	f3eae4a	1784620355	sgg/customise-default-sampling-interval

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	25.742ns	26.200ns ± 0.099ns	26.207ns ± 0.040ns	26.241ns	26.303ns	26.438ns	26.800ns	2.26%	0.636	10.421	0.38%	0.007ns	1	200
alloc_free/sampled_system_fast_path/256	execution_time	25.612ns	26.214ns ± 0.080ns	26.217ns ± 0.039ns	26.251ns	26.322ns	26.417ns	26.515ns	1.14%	-1.786	15.899	0.30%	0.006ns	1	200
alloc_free/sampled_system_fast_path/4096	execution_time	114.070ns	116.417ns ± 0.434ns	116.417ns ± 0.184ns	116.587ns	117.037ns	117.710ns	118.553ns	1.83%	-0.244	8.187	0.37%	0.031ns	1	200
alloc_free/sampled_system_fast_path/64	execution_time	25.984ns	26.210ns ± 0.064ns	26.212ns ± 0.032ns	26.242ns	26.299ns	26.399ns	26.408ns	0.75%	0.081	1.859	0.24%	0.005ns	1	200
alloc_free/sampled_system_fast_path/65536	execution_time	99.412ns	100.072ns ± 0.325ns	100.042ns ± 0.141ns	100.189ns	100.579ns	101.145ns	101.898ns	1.85%	1.698	6.659	0.32%	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	[26.186ns; 26.214ns] or [-0.053%; +0.053%]	None	None	None
alloc_free/sampled_system_fast_path/256	execution_time	[26.203ns; 26.225ns] or [-0.042%; +0.042%]	None	None	None
alloc_free/sampled_system_fast_path/4096	execution_time	[116.357ns; 116.477ns] or [-0.052%; +0.052%]	None	None	None
alloc_free/sampled_system_fast_path/64	execution_time	[26.201ns; 26.219ns] or [-0.034%; +0.034%]	None	None	None
alloc_free/sampled_system_fast_path/65536	execution_time	[100.027ns; 100.117ns] or [-0.045%; +0.045%]	None	None	None

Group 4

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	f3eae4a	1784620355	sgg/customise-default-sampling-interval

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	14.052ns	14.292ns ± 0.095ns	14.290ns ± 0.055ns	14.345ns	14.436ns	14.502ns	14.779ns	3.42%	0.691	3.453	0.67%	0.007ns	1	200
alloc_free/system/256	execution_time	14.002ns	14.286ns ± 0.097ns	14.282ns ± 0.053ns	14.339ns	14.425ns	14.552ns	14.746ns	3.25%	0.370	2.589	0.68%	0.007ns	1	200
alloc_free/system/4096	execution_time	90.239ns	93.292ns ± 0.663ns	93.359ns ± 0.306ns	93.651ns	94.143ns	94.496ns	94.577ns	1.30%	-1.836	6.177	0.71%	0.047ns	1	200
alloc_free/system/64	execution_time	14.053ns	14.306ns ± 0.114ns	14.292ns ± 0.057ns	14.353ns	14.458ns	14.722ns	14.899ns	4.25%	1.824	6.718	0.79%	0.008ns	1	200
alloc_free/system/65536	execution_time	87.868ns	88.531ns ± 0.260ns	88.520ns ± 0.115ns	88.625ns	88.895ns	89.324ns	90.046ns	1.72%	1.422	6.473	0.29%	0.018ns	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; 14.306ns] or [-0.092%; +0.092%]	None	None	None
alloc_free/system/256	execution_time	[14.272ns; 14.299ns] or [-0.094%; +0.094%]	None	None	None
alloc_free/system/4096	execution_time	[93.200ns; 93.384ns] or [-0.098%; +0.098%]	None	None	None
alloc_free/system/64	execution_time	[14.291ns; 14.322ns] or [-0.110%; +0.110%]	None	None	None
alloc_free/system/65536	execution_time	[88.495ns; 88.567ns] or [-0.041%; +0.041%]	None	None	None

Group 5

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	f3eae4a	1784620355	sgg/customise-default-sampling-interval

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	61.787ns	62.111ns ± 0.087ns	62.106ns ± 0.022ns	62.127ns	62.186ns	62.294ns	63.094ns	1.59%	7.069	79.430	0.14%	0.006ns	1	200
sampler_only/slow_path/256	execution_time	61.902ns	62.283ns ± 0.058ns	62.283ns ± 0.017ns	62.298ns	62.362ns	62.510ns	62.528ns	0.39%	-0.622	13.429	0.09%	0.004ns	1	200
sampler_only/slow_path/4096	execution_time	62.324ns	62.536ns ± 0.238ns	62.521ns ± 0.025ns	62.546ns	62.597ns	62.669ns	65.804ns	5.25%	13.064	177.097	0.38%	0.017ns	1	200
sampler_only/slow_path/64	execution_time	61.947ns	62.279ns ± 0.089ns	62.268ns ± 0.021ns	62.292ns	62.365ns	62.505ns	63.122ns	1.37%	5.654	49.379	0.14%	0.006ns	1	200
sampler_only/slow_path/65536	execution_time	66.266ns	66.694ns ± 0.084ns	66.690ns ± 0.032ns	66.723ns	66.768ns	66.962ns	67.277ns	0.88%	1.495	16.415	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	[62.098ns; 62.123ns] or [-0.020%; +0.020%]	None	None	None
sampler_only/slow_path/256	execution_time	[62.275ns; 62.291ns] or [-0.013%; +0.013%]	None	None	None
sampler_only/slow_path/4096	execution_time	[62.503ns; 62.569ns] or [-0.053%; +0.053%]	None	None	None
sampler_only/slow_path/64	execution_time	[62.266ns; 62.291ns] or [-0.020%; +0.020%]	None	None	None
sampler_only/slow_path/65536	execution_time	[66.682ns; 66.706ns] or [-0.017%; +0.017%]	None	None	None

Group 6

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	f3eae4a	1784620355	sgg/customise-default-sampling-interval

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	0.408ns	1.43%	5.343	48.758	0.14%	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	0.406ns	1.03%	4.232	31.026	0.13%	0.000ns	1	200
alloc_free/noop/4096	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.403ns	0.408ns	1.42%	6.221	63.770	0.13%	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	0.54%	0.203	6.502	0.10%	0.000ns	1	200
alloc_free/noop/65536	execution_time	0.400ns	0.402ns ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.404ns	0.407ns	1.21%	4.567	47.381	0.12%	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 [-0.020%; +0.020%]	None	None	None
alloc_free/noop/256	execution_time	[0.402ns; 0.402ns] or [-0.018%; +0.018%]	None	None	None
alloc_free/noop/4096	execution_time	[0.402ns; 0.402ns] or [-0.018%; +0.018%]	None	None	None
alloc_free/noop/64	execution_time	[0.402ns; 0.402ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/noop/65536	execution_time	[0.402ns; 0.402ns] or [-0.017%; +0.017%]	None	None	None

Group 7

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	f3eae4a	1784620355	sgg/customise-default-sampling-interval

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	63.656ns	64.054ns ± 0.085ns	64.048ns ± 0.021ns	64.071ns	64.132ns	64.237ns	64.864ns	1.27%	4.564	45.579	0.13%	0.006ns	1	200
alloc_free/sampled_noop_slow_path/256	execution_time	63.644ns	63.908ns ± 0.110ns	63.895ns ± 0.023ns	63.922ns	63.991ns	64.154ns	65.220ns	2.07%	8.725	100.603	0.17%	0.008ns	1	200
alloc_free/sampled_noop_slow_path/4096	execution_time	63.930ns	64.279ns ± 0.098ns	64.264ns ± 0.026ns	64.294ns	64.360ns	64.622ns	65.319ns	1.64%	6.384	63.829	0.15%	0.007ns	1	200
alloc_free/sampled_noop_slow_path/64	execution_time	63.752ns	64.067ns ± 0.111ns	64.063ns ± 0.019ns	64.078ns	64.152ns	64.248ns	65.323ns	1.97%	7.674	82.950	0.17%	0.008ns	1	200
alloc_free/sampled_noop_slow_path/65536	execution_time	68.241ns	68.640ns ± 0.109ns	68.633ns ± 0.031ns	68.663ns	68.760ns	69.129ns	69.423ns	1.15%	3.576	24.312	0.16%	0.008ns	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	[64.042ns; 64.066ns] or [-0.018%; +0.018%]	None	None	None
alloc_free/sampled_noop_slow_path/256	execution_time	[63.893ns; 63.924ns] or [-0.024%; +0.024%]	None	None	None
alloc_free/sampled_noop_slow_path/4096	execution_time	[64.265ns; 64.293ns] or [-0.021%; +0.021%]	None	None	None
alloc_free/sampled_noop_slow_path/64	execution_time	[64.052ns; 64.082ns] or [-0.024%; +0.024%]	None	None	None
alloc_free/sampled_noop_slow_path/65536	execution_time	[68.625ns; 68.655ns] or [-0.022%; +0.022%]	None	None	None

Group 8

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	f3eae4a	1784620355	sgg/customise-default-sampling-interval

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	88.799ns	89.416ns ± 0.086ns	89.410ns ± 0.029ns	89.442ns	89.535ns	89.683ns	89.839ns	0.48%	-0.784	16.225	0.10%	0.006ns	1	200
alloc_free/sampled_system_slow_path/256	execution_time	89.638ns	89.915ns ± 0.090ns	89.907ns ± 0.035ns	89.944ns	90.041ns	90.350ns	90.419ns	0.57%	1.799	10.024	0.10%	0.006ns	1	200
alloc_free/sampled_system_slow_path/4096	execution_time	150.828ns	151.779ns ± 0.387ns	151.733ns ± 0.160ns	151.897ns	152.322ns	152.868ns	154.914ns	2.10%	3.464	23.423	0.25%	0.027ns	1	200
alloc_free/sampled_system_slow_path/64	execution_time	89.241ns	89.582ns ± 0.138ns	89.571ns ± 0.039ns	89.609ns	89.679ns	90.086ns	91.086ns	1.69%	6.941	70.718	0.15%	0.010ns	1	200
alloc_free/sampled_system_slow_path/65536	execution_time	154.044ns	155.873ns ± 0.244ns	155.864ns ± 0.107ns	155.997ns	156.206ns	156.471ns	156.563ns	0.45%	-1.926	14.986	0.16%	0.017ns	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	[89.404ns; 89.428ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_system_slow_path/256	execution_time	[89.903ns; 89.928ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_system_slow_path/4096	execution_time	[151.726ns; 151.833ns] or [-0.035%; +0.035%]	None	None	None
alloc_free/sampled_system_slow_path/64	execution_time	[89.563ns; 89.601ns] or [-0.021%; +0.021%]	None	None	None
alloc_free/sampled_system_slow_path/65536	execution_time	[155.839ns; 155.907ns] or [-0.022%; +0.022%]	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	fb65e46	1784569050	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	14.001ns	14.070ns ± 0.019ns	14.068ns ± 0.005ns	14.073ns	14.090ns	14.109ns	14.258ns	1.36%	5.787	51.654	0.14%	0.001ns	1	200
sampler_only/fast_path/256	execution_time	14.002ns	14.069ns ± 0.012ns	14.068ns ± 0.005ns	14.073ns	14.087ns	14.109ns	14.122ns	0.39%	-0.486	10.342	0.09%	0.001ns	1	200
sampler_only/fast_path/4096	execution_time	14.001ns	14.069ns ± 0.013ns	14.068ns ± 0.005ns	14.074ns	14.082ns	14.108ns	14.143ns	0.53%	0.060	12.709	0.09%	0.001ns	1	200
sampler_only/fast_path/64	execution_time	14.001ns	14.068ns ± 0.012ns	14.068ns ± 0.005ns	14.072ns	14.084ns	14.103ns	14.119ns	0.37%	-0.691	10.442	0.08%	0.001ns	1	200
sampler_only/fast_path/65536	execution_time	14.003ns	14.068ns ± 0.013ns	14.069ns ± 0.005ns	14.073ns	14.083ns	14.111ns	14.158ns	0.63%	0.793	14.936	0.09%	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	[14.067ns; 14.072ns] or [-0.019%; +0.019%]	None	None	None
sampler_only/fast_path/256	execution_time	[14.067ns; 14.071ns] or [-0.012%; +0.012%]	None	None	None
sampler_only/fast_path/4096	execution_time	[14.067ns; 14.070ns] or [-0.013%; +0.013%]	None	None	None
sampler_only/fast_path/64	execution_time	[14.066ns; 14.070ns] or [-0.012%; +0.012%]	None	None	None
sampler_only/fast_path/65536	execution_time	[14.067ns; 14.070ns] or [-0.013%; +0.013%]	None	None	None

Group 2

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	fb65e46	1784569050	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	14.473ns ± 0.014ns	14.471ns ± 0.006ns	14.478ns	14.491ns	14.510ns	14.577ns	0.73%	1.934	17.366	0.10%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/256	execution_time	14.403ns	14.471ns ± 0.036ns	14.468ns ± 0.005ns	14.474ns	14.486ns	14.512ns	14.952ns	3.34%	11.728	153.934	0.25%	0.003ns	1	200
alloc_free/sampled_noop_fast_path/4096	execution_time	14.401ns	14.474ns ± 0.053ns	14.470ns ± 0.005ns	14.476ns	14.491ns	14.513ns	15.196ns	5.02%	12.842	173.330	0.36%	0.004ns	1	200
alloc_free/sampled_noop_fast_path/64	execution_time	14.401ns	14.471ns ± 0.014ns	14.471ns ± 0.005ns	14.475ns	14.488ns	14.500ns	14.581ns	0.76%	1.379	22.271	0.10%	0.001ns	1	200
alloc_free/sampled_noop_fast_path/65536	execution_time	14.403ns	14.472ns ± 0.017ns	14.470ns ± 0.005ns	14.476ns	14.490ns	14.554ns	14.597ns	0.88%	2.754	20.591	0.12%	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	[14.471ns; 14.475ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_fast_path/256	execution_time	[14.466ns; 14.476ns] or [-0.035%; +0.035%]	None	None	None
alloc_free/sampled_noop_fast_path/4096	execution_time	[14.467ns; 14.482ns] or [-0.051%; +0.051%]	None	None	None
alloc_free/sampled_noop_fast_path/64	execution_time	[14.469ns; 14.473ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_fast_path/65536	execution_time	[14.469ns; 14.474ns] or [-0.017%; +0.017%]	None	None	None

Group 3

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	fb65e46	1784569050	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	25.728ns	26.208ns ± 0.082ns	26.215ns ± 0.038ns	26.251ns	26.304ns	26.372ns	26.438ns	0.85%	-1.568	7.533	0.31%	0.006ns	1	200
alloc_free/sampled_system_fast_path/256	execution_time	25.978ns	26.220ns ± 0.082ns	26.218ns ± 0.044ns	26.260ns	26.325ns	26.385ns	26.875ns	2.51%	2.320	19.281	0.31%	0.006ns	1	200
alloc_free/sampled_system_fast_path/4096	execution_time	101.780ns	103.722ns ± 0.504ns	103.710ns ± 0.234ns	103.934ns	104.397ns	105.542ns	106.510ns	2.70%	1.342	7.530	0.49%	0.036ns	1	200
alloc_free/sampled_system_fast_path/64	execution_time	26.031ns	26.208ns ± 0.061ns	26.206ns ± 0.038ns	26.244ns	26.297ns	26.361ns	26.481ns	1.05%	0.372	1.860	0.23%	0.004ns	1	200
alloc_free/sampled_system_fast_path/65536	execution_time	98.588ns	100.054ns ± 0.303ns	100.053ns ± 0.139ns	100.185ns	100.446ns	100.727ns	102.143ns	2.09%	0.987	13.059	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	[26.196ns; 26.219ns] or [-0.043%; +0.043%]	None	None	None
alloc_free/sampled_system_fast_path/256	execution_time	[26.208ns; 26.231ns] or [-0.043%; +0.043%]	None	None	None
alloc_free/sampled_system_fast_path/4096	execution_time	[103.652ns; 103.792ns] or [-0.067%; +0.067%]	None	None	None
alloc_free/sampled_system_fast_path/64	execution_time	[26.199ns; 26.216ns] or [-0.032%; +0.032%]	None	None	None
alloc_free/sampled_system_fast_path/65536	execution_time	[100.012ns; 100.096ns] or [-0.042%; +0.042%]	None	None	None

Group 4

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	fb65e46	1784569050	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	14.011ns	14.288ns ± 0.144ns	14.275ns ± 0.045ns	14.325ns	14.425ns	14.824ns	15.649ns	9.62%	5.212	43.329	1.00%	0.010ns	1	200
alloc_free/system/256	execution_time	14.056ns	14.312ns ± 0.123ns	14.300ns ± 0.048ns	14.348ns	14.439ns	14.796ns	15.436ns	7.95%	4.534	35.873	0.86%	0.009ns	1	200
alloc_free/system/4096	execution_time	89.624ns	93.173ns ± 0.722ns	93.226ns ± 0.309ns	93.500ns	94.226ns	95.026ns	95.420ns	2.35%	-0.976	5.747	0.77%	0.051ns	1	200
alloc_free/system/64	execution_time	14.002ns	14.315ns ± 0.114ns	14.302ns ± 0.055ns	14.359ns	14.507ns	14.762ns	15.053ns	5.26%	2.097	10.423	0.79%	0.008ns	1	200
alloc_free/system/65536	execution_time	87.808ns	88.410ns ± 0.194ns	88.416ns ± 0.098ns	88.512ns	88.753ns	88.890ns	89.001ns	0.66%	-0.231	1.465	0.22%	0.014ns	1	200

scenario	metric	95% CI mean	Shapiro-Wilk pvalue	Ljung-Box pvalue (lag=1)	Dip test pvalue
alloc_free/system/16	execution_time	[14.268ns; 14.307ns] or [-0.139%; +0.139%]	None	None	None
alloc_free/system/256	execution_time	[14.295ns; 14.329ns] or [-0.119%; +0.119%]	None	None	None
alloc_free/system/4096	execution_time	[93.073ns; 93.273ns] or [-0.107%; +0.107%]	None	None	None
alloc_free/system/64	execution_time	[14.299ns; 14.331ns] or [-0.110%; +0.110%]	None	None	None
alloc_free/system/65536	execution_time	[88.384ns; 88.437ns] or [-0.030%; +0.030%]	None	None	None

Group 5

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	fb65e46	1784569050	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	61.817ns	62.110ns ± 0.065ns	62.104ns ± 0.023ns	62.131ns	62.199ns	62.301ns	62.562ns	0.74%	1.746	15.026	0.11%	0.005ns	1	200
sampler_only/slow_path/256	execution_time	61.863ns	62.139ns ± 0.088ns	62.126ns ± 0.022ns	62.156ns	62.218ns	62.437ns	63.054ns	1.49%	6.206	60.004	0.14%	0.006ns	1	200
sampler_only/slow_path/4096	execution_time	62.206ns	62.642ns ± 0.062ns	62.641ns ± 0.024ns	62.662ns	62.731ns	62.822ns	62.878ns	0.38%	-1.269	14.512	0.10%	0.004ns	1	200
sampler_only/slow_path/64	execution_time	61.823ns	62.130ns ± 0.063ns	62.125ns ± 0.017ns	62.143ns	62.216ns	62.290ns	62.618ns	0.79%	1.872	22.070	0.10%	0.004ns	1	200
sampler_only/slow_path/65536	execution_time	66.423ns	66.818ns ± 0.096ns	66.814ns ± 0.025ns	66.839ns	66.910ns	67.074ns	67.725ns	1.36%	4.000	40.373	0.14%	0.007ns	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	[62.101ns; 62.119ns] or [-0.015%; +0.015%]	None	None	None
sampler_only/slow_path/256	execution_time	[62.127ns; 62.151ns] or [-0.020%; +0.020%]	None	None	None
sampler_only/slow_path/4096	execution_time	[62.633ns; 62.650ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/slow_path/64	execution_time	[62.121ns; 62.139ns] or [-0.014%; +0.014%]	None	None	None
sampler_only/slow_path/65536	execution_time	[66.804ns; 66.831ns] or [-0.020%; +0.020%]	None	None	None

Group 6

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	fb65e46	1784569050	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 ± 0.000ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.403ns	0.403ns	0.35%	-0.154	6.947	0.09%	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	0.408ns	1.58%	7.543	86.241	0.14%	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	0.404ns	0.56%	-0.015	13.974	0.09%	0.000ns	1	200
alloc_free/noop/64	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.403ns	0.403ns	0.409ns	1.86%	7.058	74.341	0.17%	0.000ns	1	200
alloc_free/noop/65536	execution_time	0.400ns	0.402ns ± 0.001ns	0.402ns ± 0.000ns	0.402ns	0.402ns	0.403ns	0.414ns	3.10%	11.453	148.273	0.23%	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 [-0.012%; +0.012%]	None	None	None
alloc_free/noop/256	execution_time	[0.402ns; 0.402ns] or [-0.019%; +0.019%]	None	None	None
alloc_free/noop/4096	execution_time	[0.402ns; 0.402ns] or [-0.012%; +0.012%]	None	None	None
alloc_free/noop/64	execution_time	[0.402ns; 0.402ns] or [-0.023%; +0.023%]	None	None	None
alloc_free/noop/65536	execution_time	[0.402ns; 0.402ns] or [-0.033%; +0.033%]	None	None	None

Group 7

cpu_model	git_commit_sha	git_commit_date	git_branch
Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	fb65e46	1784569050	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	63.667ns	63.885ns ± 0.066ns	63.880ns ± 0.025ns	63.908ns	63.985ns	64.124ns	64.303ns	0.66%	1.571	9.250	0.10%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/256	execution_time	63.600ns	64.032ns ± 0.074ns	64.028ns ± 0.028ns	64.056ns	64.110ns	64.324ns	64.593ns	0.88%	1.958	23.311	0.12%	0.005ns	1	200
alloc_free/sampled_noop_slow_path/4096	execution_time	64.115ns	64.394ns ± 0.063ns	64.392ns ± 0.024ns	64.415ns	64.473ns	64.556ns	64.820ns	0.67%	1.051	11.841	0.10%	0.004ns	1	200
alloc_free/sampled_noop_slow_path/64	execution_time	63.682ns	64.009ns ± 0.063ns	64.003ns ± 0.022ns	64.027ns	64.090ns	64.209ns	64.442ns	0.69%	1.379	15.318	0.10%	0.004ns	1	200
alloc_free/sampled_noop_slow_path/65536	execution_time	67.907ns	68.604ns ± 0.093ns	68.604ns ± 0.027ns	68.630ns	68.691ns	68.913ns	69.202ns	0.87%	-1.107	27.204	0.14%	0.007ns	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	[63.876ns; 63.894ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_slow_path/256	execution_time	[64.022ns; 64.043ns] or [-0.016%; +0.016%]	None	None	None
alloc_free/sampled_noop_slow_path/4096	execution_time	[64.385ns; 64.403ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_slow_path/64	execution_time	[64.000ns; 64.017ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_noop_slow_path/65536	execution_time	[68.591ns; 68.616ns] 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	fb65e46	1784569050	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	89.235ns	89.681ns ± 0.085ns	89.680ns ± 0.039ns	89.718ns	89.807ns	89.949ns	90.088ns	0.45%	0.278	7.647	0.09%	0.006ns	1	200
alloc_free/sampled_system_slow_path/256	execution_time	89.247ns	89.630ns ± 0.113ns	89.621ns ± 0.030ns	89.651ns	89.760ns	89.943ns	90.719ns	1.23%	5.179	45.837	0.13%	0.008ns	1	200
alloc_free/sampled_system_slow_path/4096	execution_time	154.748ns	156.542ns ± 0.339ns	156.559ns ± 0.177ns	156.737ns	156.980ns	157.395ns	157.994ns	0.92%	-0.546	5.453	0.22%	0.024ns	1	200
alloc_free/sampled_system_slow_path/64	execution_time	89.126ns	89.483ns ± 0.089ns	89.471ns ± 0.039ns	89.520ns	89.604ns	89.756ns	90.113ns	0.72%	2.098	13.950	0.10%	0.006ns	1	200
alloc_free/sampled_system_slow_path/65536	execution_time	153.995ns	155.666ns ± 0.358ns	155.668ns ± 0.088ns	155.746ns	155.935ns	156.616ns	159.016ns	2.15%	3.373	41.315	0.23%	0.025ns	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	[89.669ns; 89.693ns] or [-0.013%; +0.013%]	None	None	None
alloc_free/sampled_system_slow_path/256	execution_time	[89.614ns; 89.646ns] or [-0.018%; +0.018%]	None	None	None
alloc_free/sampled_system_slow_path/4096	execution_time	[156.495ns; 156.589ns] or [-0.030%; +0.030%]	None	None	None
alloc_free/sampled_system_slow_path/64	execution_time	[89.470ns; 89.495ns] or [-0.014%; +0.014%]	None	None	None
alloc_free/sampled_system_slow_path/65536	execution_time	[155.616ns; 155.716ns] or [-0.032%; +0.032%]	None	None	None

[chatgpt-codex-connector]

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[r1viollet]

LGTM
When we plug the auto-tuning of sampling distance we will have to think about how to document the behaviour. Though happy to think about that when we get there.

[dd-octo-sts]

Artifact Size Benchmark Report

aarch64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.a	88.03 MB	88.03 MB	0% (0 B) 👌
/aarch64-alpine-linux-musl/lib/libdatadog_profiling.so	8.13 MB	8.13 MB	0% (0 B) 👌

aarch64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.so	10.86 MB	10.86 MB	0% (0 B) 👌
/aarch64-unknown-linux-gnu/lib/libdatadog_profiling.a	99.31 MB	99.31 MB	0% (0 B) 👌

libdatadog-x64-windows

Artifact	Baseline	Commit	Change
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.dll	26.55 MB	26.55 MB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.lib	89.18 KB	89.18 KB	0% (0 B) 👌
/libdatadog-x64-windows/debug/dynamic/datadog_profiling_ffi.pdb	191.10 MB	191.09 MB	-0% (-8.00 KB) 👌
/libdatadog-x64-windows/debug/static/datadog_profiling_ffi.lib	1.04 GB	1.04 GB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.dll	8.65 MB	8.65 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.lib	89.18 KB	89.18 KB	0% (0 B) 👌
/libdatadog-x64-windows/release/dynamic/datadog_profiling_ffi.pdb	25.31 MB	25.31 MB	0% (0 B) 👌
/libdatadog-x64-windows/release/static/datadog_profiling_ffi.lib	50.49 MB	50.49 MB	0% (0 B) 👌

libdatadog-x86-windows

Artifact	Baseline	Commit	Change
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.dll	23.13 MB	23.13 MB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.lib	90.58 KB	90.58 KB	0% (0 B) 👌
/libdatadog-x86-windows/debug/dynamic/datadog_profiling_ffi.pdb	195.80 MB	195.80 MB	-0% (-8.00 KB) 👌
/libdatadog-x86-windows/debug/static/datadog_profiling_ffi.lib	1.03 GB	1.03 GB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.dll	6.67 MB	6.67 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.lib	90.58 KB	90.58 KB	0% (0 B) 👌
/libdatadog-x86-windows/release/dynamic/datadog_profiling_ffi.pdb	27.22 MB	27.22 MB	0% (0 B) 👌
/libdatadog-x86-windows/release/static/datadog_profiling_ffi.lib	48.06 MB	48.06 MB	0% (0 B) 👌

x86_64-alpine-linux-musl

Artifact	Baseline	Commit	Change
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.a	78.53 MB	78.53 MB	0% (0 B) 👌
/x86_64-alpine-linux-musl/lib/libdatadog_profiling.so	9.04 MB	9.04 MB	0% (0 B) 👌

x86_64-unknown-linux-gnu

Artifact	Baseline	Commit	Change
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.a	94.02 MB	94.02 MB	0% (0 B) 👌
/x86_64-unknown-linux-gnu/lib/libdatadog_profiling.so	11.00 MB	11.00 MB	0% (0 B) 👌

[r1viollet]

removing from merge queue, just to let the fixes go in