If you want to see contributions to Linus that used AI you can search for commits with tags that look like this in their commit message:

  Assisted-by: Codex:gpt-5.5
  Assisted-by: Claude:claude-opus-4.8

This search on GitHub seems to find about 2,000 of those:

  repo:torvalds/linux assisted-by (claude OR codex)

https://github.com/search?q=repo%3Atorvalds%2Flinux+assisted...

... but if you clone the git repo you can get an exact count of 824 commits (not sure why the search over-counted).

Here's a good candidate for a material performance improvement:

https://github.com/torvalds/linux/commit/e1bf79628453e6afac8...

  Single-stream throughput (MB/s):
                        Before    After    Change
  seq-write/dontcache      298      897    +201%
  rand-write/dontcache     131      236     +80%