netdev - Re: [PATCH] mm: remove zap_page_range and create zap_vma

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Message-ID: <Y7XA6JEUOgOkz988@osiris>
Date:   Wed, 4 Jan 2023 19:09:44 +0100
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Michal Hocko <mhocko@...e.com>, Peter Xu <peterx@...hat.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Will Deacon <will@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Palmer Dabbelt <palmer@...belt.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Christian Brauner <brauner@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: remove zap_page_range and create zap_vma_pages

On Tue, Jan 03, 2023 at 04:27:32PM -0800, Mike Kravetz wrote:
> zap_page_range was originally designed to unmap pages within an address
> range that could span multiple vmas.  While working on [1], it was
> discovered that all callers of zap_page_range pass a range entirely within
> a single vma.  In addition, the mmu notification call within zap_page
> range does not correctly handle ranges that span multiple vmas.  When
> crossing a vma boundary, a new mmu_notifier_range_init/end call pair
> with the new vma should be made.
> 
> Instead of fixing zap_page_range, do the following:
> - Create a new routine zap_vma_pages() that will remove all pages within
>   the passed vma.  Most users of zap_page_range pass the entire vma and
>   can use this new routine.
> - For callers of zap_page_range not passing the entire vma, instead call
>   zap_page_range_single().
> - Remove zap_page_range.
> 
> [1] https://lore.kernel.org/linux-mm/20221114235507.294320-2-mike.kravetz@oracle.com/
> Suggested-by: Peter Xu <peterx@...hat.com>
> Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
> ---
> RFC->v1 Created zap_vma_pages to zap entire vma (Christoph Hellwig)
>         Did not add Acked-by's as routine was changed.
> 
>  arch/arm64/kernel/vdso.c                |  6 ++---
>  arch/powerpc/kernel/vdso.c              |  4 +---
>  arch/powerpc/platforms/book3s/vas-api.c |  2 +-
>  arch/powerpc/platforms/pseries/vas.c    |  3 +--
>  arch/riscv/kernel/vdso.c                |  6 ++---
>  arch/s390/kernel/vdso.c                 |  4 +---
>  arch/s390/mm/gmap.c                     |  2 +-
>  arch/x86/entry/vdso/vma.c               |  4 +---
>  drivers/android/binder_alloc.c          |  2 +-
>  include/linux/mm.h                      |  7 ++++--
>  mm/memory.c                             | 30 -------------------------
>  mm/page-writeback.c                     |  2 +-
>  net/ipv4/tcp.c                          |  7 +++---
>  13 files changed, 21 insertions(+), 58 deletions(-)

For s390:
Acked-by: Heiko Carstens <hca@...ux.ibm.com>