linux-kernel - Re: 4.13..4.14 scheduling overhead regression (bisected

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Date:   Fri, 1 Jun 2018 15:20:55 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mike Galbraith <efault@....de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: 4.13..4.14 scheduling overhead regression (bisected  -
 b956575bed91)

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@...nel.org>
> 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.