Re: 4.13..4.14 scheduling overhead regression (bisected - b956575bed91)
From: Peter Zijlstra
Date: Fri Jun 01 2018 - 09:21:10 EST
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.