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

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Message-ID: <20180604072518.GM12217@hirez.programming.kicks-ass.net>
Date:   Mon, 4 Jun 2018 09:25:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Rik van Riel <riel@...riel.com>
Cc:     Mike Galbraith <efault@....de>,
        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 02:56:29PM -0400, Rik van Riel wrote:

> > IIRC all page freeing does indeed go through tlb_remove_page(), it
> > shouldn't be too hard to make that work.
> 
> Page freeing does. However, page table freeing
> does not, and might need to be done in a different
> way.

We have tlb_remove_table() for those. And that had better work otherwise
the whole 'RCU'-freed page table mess is broken :-)


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