On Fri, Mar 23, 2018 at 5:46 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> It is, of course, possible that I misunderstood what you actually
> benchmarked. But I assume the above benchmark numbers are with the
> whole "don't even do global entries if you have PCID".
Oh, I went back and read your description, and realized that I _had_
misunderstood what you did.
I thought you didn't bother with global pages at all when you had PCID.
But that's not what you meant. You always do global for the actual
user-mapped kernel pages, but when you don't have PCID you do *all*
kernel test as global, whether shared or not.
So I entirely misread what the latest change was.
Linus
