linux-kernel - Re: [PATCH 00/13] mmu_notifier kill invalidate

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Date:   Tue, 29 Aug 2017 20:56:15 -0400
From:   Jerome Glisse <jglisse@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Bernhard Held <berny156@....de>,
        Adam Borowski <kilobyte@...band.pl>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Joerg Roedel <jroedel@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Sudeep Dutt <sudeep.dutt@...el.com>,
        Ashutosh Dixit <ashutosh.dixit@...el.com>,
        Dimitri Sivanich <sivanich@....com>,
        Jack Steiner <steiner@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        DRI <dri-devel@...ts.freedesktop.org>,
        amd-gfx@...ts.freedesktop.org,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "open list:AMD IOMMU (AMD-VI)" <iommu@...ts.linux-foundation.org>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH 00/13] mmu_notifier kill invalidate_page callback

On Tue, Aug 29, 2017 at 05:11:24PM -0700, Linus Torvalds wrote:
> On Tue, Aug 29, 2017 at 4:54 PM, Jérôme Glisse <jglisse@...hat.com> wrote:
> >
> > Note this is barely tested. I intend to do more testing of next few days
> > but i do not have access to all hardware that make use of the mmu_notifier
> > API.
> 
> Thanks for doing this.
> 
> > First 2 patches convert existing call of mmu_notifier_invalidate_page()
> > to mmu_notifier_invalidate_range() and bracket those call with call to
> > mmu_notifier_invalidate_range_start()/end().
> 
> Ok, those two patches are a bit more complex than I was hoping for,
> but not *too* bad.
> 
> And the final end result certainly looks nice:
> 
> >  16 files changed, 74 insertions(+), 214 deletions(-)
> 
> Yeah, removing all those invalidate_page() notifiers certainly makes
> for a nice patch.
> 
> And I actually think you missed some more lines that can now be
> removed: kvm_arch_mmu_notifier_invalidate_page() should no longer be
> needed either, so you can remove all of those too (most of them are
> empty inline functions, but x86 has one that actually does something.
> 
> So there's an added 30 or so dead lines that should be removed in the
> kvm patch, I think.

Yes i missed that. I will wait for people to test and for result of my
own test before reposting if need be, otherwise i will post as separate
patch.

> 
> But from a _very_ quick read-through this looks fine. But it obviously
> needs testing.
> 
> People - *especially* the people who saw issues under KVM - can you
> try out Jérôme's patch-series? I aded some people to the cc, the full
> series is on lkml. Jérôme - do you have a git branch for people to
> test that they could easily pull and try out?

https://cgit.freedesktop.org/~glisse/linux mmu-notifier branch
git://people.freedesktop.org/~glisse/linux

(Sorry if that tree is bit big it has a lot of dead thing i need
 to push a clean and slim one)

Jérôme