[Lldb-commits] [lldb] adds additional information to the ProcessInfo object for elf processes (PR #88995)

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jimingham 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

It should never decrease, however.  If you were just getting garbage values, then there should be a roughly even chance the second value will be less than the first.  So this still gives some confidence this isn't totally bogus...

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