Re: CONFIG_VMAP_STACK, on-stack struct, and wake_up_bit

[Linus Torvalds]

On Wed, Oct 26, 2016 at 3:03 PM, Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> wrote:
>
> To be clear, are you referring to PeterZ's patch that avoids the lookup? If
> so, I see your point.

Yup, that's the one. I think you tested it. In fact, I'm sure you did,
because I remember seeing performance numbers from  you ;)

So yes, I'd expect my patch on its own to quite possibly regress on
NUMA systems (although I wonder how much), but I consider PeterZ's
patch the fix to that, so I wouldn't worry about it.

              Linus