[Lldb-commits] [PATCH] D116255: [lldb] [Process/FreeBSDKernel] Support finding all processes

Thu Dec 30 04:05:44 PST 2021

mgorny added a comment.

In D116255#3213612 <https://reviews.llvm.org/D116255#3213612>, @labath wrote:

> That would deal with the code coverage, but it still leaves us with a fairly large core file, and a lot of uninteresting tests obscuring the output.
>
> How do you generate these core files? Do you actually create a fresh core dump or you just recompute the "interesting" portions from a master file you have around? If you make the changes the the master core file, then they would get automatically picked up during the recomputation.

I do recompute them from master copies (which I finally need to upload somewhere) but the recomputation is really dumb and unaware of the file format. I suppose I could just hack LLDB to stop after grabbing the first N threads but… the first non-dump on-CPU thread is no. 200. Finishing on that will probably make the core smaller but not sure how much smaller. I'll try in a minute.

> Alternatively, maybe there is a way to capture a core file without so many processes. Either killing off everything before the core file is written, or by making sure the other processes are never started (something like `init=/bin/bash` on linux)?

The vast majority of threads are kernel threads. At a quick glance, only about 20 threads look like userspace.

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https://reviews.llvm.org/D116255