linux-kernel - Re: [PATCH 4/4] mm: delay page_remove_rmap() until after the TLB has been flushed

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Date:   Wed, 16 Nov 2022 08:47:53 +0100
From:   Alexander Gordeev <agordeev@...ux.ibm.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Nadav Amit <nadav.amit@...il.com>,
        Will Deacon <will@...nel.org>,
        Aneesh Kumar <aneesh.kumar@...ux.ibm.com>,
        Nick Piggin <npiggin@...il.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>
Subject: Re: [PATCH 4/4] mm: delay page_remove_rmap() until after the TLB has
 been flushed

On Wed, Nov 09, 2022 at 01:04:07PM -0800, Linus Torvalds wrote:

Hi Linus,

[...]

> And I was so happy about sharing the s390 and UP case, and avoiding
> any code being specific to s390. Which is what introduced this thing.

Which actually brings a question whether CONFIG_MMU_GATHER_NO_GATHER
mode could be beneficial for UP?

But anyway, please find a follow-up series on top of mm-unstable
with patches 1,2 aimed to avoid delayed_rmap flag on s390/UP and
patches 3,4 hopefully cleaning things a bit (not so sure).

>                 Linus

Thanks!