On Fri, 29 Aug 2025 09:28:41 -0700 Linus Torvalds <torva...@linux-foundation.org> wrote:
> Don't try to "reuse" hashes. Just treat them as opaque numbers. What do I use to make the hash? One thing this is trying to do is not have to look up the path name for every line of a stack trace. I could just have every instance do the full look up, make a hash from the path name and build id, and pass the hash to the caller. My worry is the time it takes to generate that. Perhaps I could have a hash that maps the pid with the vma->vm_start, and if that's unique, get the path and build-id and create the hash for that and send it back to the user. Save the hash for that mapping in the rhashtable with the pid/vm_start as the key. Then the code that adds the vma, will see if the pid/vma->start exists, if it does, return the hash associated with that, if it does not, add it and trigger the event that a new address has been created. -- Steve
