[BUG] Simpleperf callstacks frequently mangled

[benjaminRomano]

Description

Background

We are exploring differential flame graphs based off of simpleperf data for commit-over-commit performance comparisons. We noticed that frequently our callstacks will be mangled which breaks the ability to do comparisons. Here is an article that discusses this problem in more depth.

I've shared an example of simpleperf in the following ticket (it's in a private component Carmen Jackson can help give access): https://partnerissuetracker.corp.google.com/issues/265123009

Ask
Is there any opportunity to improve heuristic used to patch up callstacks more reliably? Would reducing sampling frequency reduce the odds of callstacks being lost?

I do know that Py was able to patch up some of these mangled callstacks using android-specific heuristics, but it only applies to the main thread: https://github.com/pyricau/simpleperf-cleanup

Affected versions

r23, r24, r25, Canary

Canary version

No response

Host OS

Linux, Mac, Windows

Host OS version

n/a

Affected ABIs

armeabi-v7a, arm64-v8a, x86, x86_64

Build system

Other (specify below)

Other build system

n/a

minSdkVersion

21

Device API level

No response