Re: [RFC patch 0/5] futex: Allow lockless empty check of hashbucketplist in futex_wake()

[Linus Torvalds]

On Sun, Dec 1, 2013 at 8:55 AM, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
>
> Keeping the page invariant would bring significant performance
> advantages to hashing.

Or not. Rather, it would make things much worse. The virtual address
is much simpler and better to avoid needing any page table lookup etc
crap. The key is just the mm and the virtual address, and no silly
page table walks etc necessary.

Of course, I have no idea if people are properly using the private
futexes. glibc _should_ use them, but who the heck knows..

                Linus
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