[Perf] ARM64 regression in System.Diagnostics.Perf_Activity.ActivityAllocations

[performanceautofiler]

Run Information

Architecture	arm64
OS	ubuntu 18.04
Baseline	b58d8013dbc4f3a65e5e2242fe09a43f455a329f
Compare	84b664a9875067a97fe32b654ff32f23f4001a60
Diff	Diff

Regressions in System.Diagnostics.Perf_Activity

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
ActivityAllocations - Duration of single invocation	758.56 ns	813.42 ns	1.07	0.20	False
ActivityAllocations - Duration of single invocation	623.66 ns	715.80 ns	1.15	0.11	False

Test Report

Repro

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net6.0 --filter 'System.Diagnostics.Perf_Activity*'

Payloads

Baseline
Compare

Histogram

System.Diagnostics.Perf_Activity.ActivityAllocations(idFormat: W3C)

Description of detection logic

IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 813.4234915083607 > 802.4856996133994.
IsChangePoint: Marked as a change because one of 4/13/2022 10:02:29 PM, 4/19/2022 4:53:57 AM falls between 4/10/2022 3:30:35 PM and 4/19/2022 4:53:57 AM.
IsRegressionStdDev: Marked as regression because -6.738201722219294 (T) = (0 -836.9530328425158) / Math.Sqrt((284.7705405371702 / (23)) + (1754.8085293566023 / (18))) is less than -2.0226909200346674 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (18) - 2, .025) and -0.09216640816227123 = (766.323727398658 - 836.9530328425158) / 766.323727398658 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Diagnostics.Perf_Activity.ActivityAllocations(idFormat: Hierarchical)

```log

Description of detection logic

IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 715.7983124923339 > 655.6405660025653.
IsChangePoint: Marked as a change because one of 4/13/2022 4:27:35 PM, 4/19/2022 4:53:57 AM falls between 4/10/2022 3:30:35 PM and 4/19/2022 4:53:57 AM.
IsRegressionStdDev: Marked as regression because -11.823299540885158 (T) = (0 -708.1518629941236) / Math.Sqrt((243.4064317595605 / (20)) + (499.0656483304033 / (18))) is less than -2.028094000977961 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (20) + (18) - 2, .025) and -0.11789003363534732 = (633.4718457872224 - 708.1518629941236) / 633.4718457872224 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

[AndyAyersMS]

Possibly from #67920.

[AndyAyersMS]

@tarekgh thinks #67920 is not the likely suspect.

Another possibility given that this is arm64 is #66407. SPMI Diffs show there was an impact to System.Diagnostics.Tracing.EventListener:AddEventSource though it was a code size reduction.

The regression has persisted since then, so it does not look like noise.

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.