Re: [PATCH v4] mm: per-thread vma caching

[Linus Torvalds]

On Mon, Mar 3, 2014 at 7:13 PM, Davidlohr Bueso <davidlohr@xxxxxx> wrote:
>
> Yes, I shortly realized that was silly... but I can say for sure it can
> happen and a quick qemu run confirms it. So I see your point as to
> asking why we need it, so now I'm looking for an explanation in the
> code.

We definitely *do* have users.

One example would be ptrace -> access_process_vm -> __access_remote_vm
-> get_user_pages() -> find_extend_vma() -> find_vma_prev -> find_vma.

                    Linus
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