feg208 wrote:

> The user and system times should be monotonically increasing. So you could 
> stop at a breakpoint, fetch the times, then run your program through a little 
> spin loop to burn some CPU before hitting a second breakpoint. Then get the 
> times again and assert that they are > the first set. You could also set a 
> timer in the test between the first and second stop and assert that the 
> difference in system and user time is less than or equal to the timer 
> difference. A single threaded program can only run on one core at a time, so 
> that should always be true.

I added a test for user time. System time seems really likely to be flaky in 
the unittest. It'll increase with kernel time. However if I use side-effect 
free system calls like getpid() to try and increase that counter it seems like 
that'll move around a lot from different kernels on different machines

https://github.com/llvm/llvm-project/pull/88995
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