Re: [PATCHv14 08/17] x86/mm: Reduce untagged_addr() overhead until the first LAM user

[Peter Zijlstra]

On Tue, Jan 17, 2023 at 09:18:01AM -0800, Linus Torvalds wrote:

> But maybe even those aren't worth worrying about. At least they do the
> unmasking outside the loop - although then in the case of execve(),
> the string copies themselves are obviously done in a loop anyway.
> 
> Kirill, do you have clear numbers for that static key being a noticeable win?

Numbers would be good; I think this all started as a precaution, but
clearly that's not really working out so well :/