On Fri, Sep 6, 2024 at 7:12 AM Andrii Nakryiko <andrii@xxxxxxxxxx> wrote: > Implement speculative (lockless) resolution of VMA to inode to uprobe, > bypassing the need to take mmap_lock for reads, if possible. Patch #1 by Suren > adds mm_struct helpers that help detect whether mm_struct were changed, which > is used by uprobe logic to validate that speculative results can be trusted > after all the lookup logic results in a valid uprobe instance. Random thought: It would be nice if you could skip the MM stuff entirely and instead go through the GUP-fast path, but I guess going from a uprobe-created anon page to the corresponding uprobe is hard... but maybe if you used the anon_vma pointer as a lookup key to find the uprobe, it could work? Though then you'd need hooks in the anon_vma code... maybe not such a great idea.
