Re: 4.13..4.14 scheduling overhead regression (bisected - b956575bed91)

[Peter Zijlstra]

On Fri, Jun 01, 2018 at 02:57:53PM +0200, Mike Galbraith wrote:
> b956575bed91ecfb136a8300742ecbbf451471ab is the first bad commit
> commit b956575bed91ecfb136a8300742ecbbf451471ab
> Author: Andy Lutomirski <luto@xxxxxxxxxx>
> Date:   Mon Oct 9 09:50:49 2017 -0700
> 
>     x86/mm: Flush more aggressively in lazy TLB mode

Oh boy... Maybe we should start looking at that optimization Andy
mentioned.

IIRC all page freeing does indeed go through tlb_remove_page(), it
shouldn't be too hard to make that work.