linux-kernel - Re: [RFC PATCH] mm/rmap: do not call mmu_notifier_invalidate

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Message-ID: <20170829190644.GC7546@redhat.com>
Date:   Tue, 29 Aug 2017 15:06:45 -0400
From:   Jerome Glisse <jglisse@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Bernhard Held <berny156@....de>,
        Adam Borowski <kilobyte@...band.pl>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Takashi Iwai <tiwai@...e.de>,
        Nadav Amit <nadav.amit@...il.com>,
        Mike Galbraith <efault@....de>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        axie <axie@....com>, Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH] mm/rmap: do not call mmu_notifier_invalidate_page()
 v3

On Tue, Aug 29, 2017 at 03:05:26PM -0400, Jérôme Glisse wrote:
> Some MMU notifier need to be able to sleep during callback. This was
> broken by c7ab0d2fdc84 ("mm: convert try_to_unmap_one() to use
> page_vma_mapped_walk()").
> 
> This patch restore the sleep ability and properly capture the range of
> address that needs to be invalidated.
> 
> Relevent threads:
> https://lkml.kernel.org/r/20170809204333.27485-1-jglisse@redhat.com
> https://lkml.kernel.org/r/20170804134928.l4klfcnqatni7vsc@black.fi.intel.com
> https://marc.info/?l=kvm&m=150327081325160&w=2

Note that i haven't yet tested this patch i just wanted to put it
out there. I am gonna run some test over new few days an report.
Anyone else is welcome to test it too.

Cheers,
Jérôme