linux-kernel - Re: [PATCH 0/2] Revert and rework on the metadata accelreation

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Date:   Sat, 7 Sep 2019 15:03:32 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Jason Wang <jasowang@...hat.com>
CC:     "mst@...hat.com" <mst@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "aarcange@...hat.com" <aarcange@...hat.com>,
        "jglisse@...hat.com" <jglisse@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 0/2] Revert and rework on the metadata accelreation

On Fri, Sep 06, 2019 at 06:02:35PM +0800, Jason Wang wrote:
> 
> On 2019/9/5 下午9:59, Jason Gunthorpe wrote:
> > On Thu, Sep 05, 2019 at 08:27:34PM +0800, Jason Wang wrote:
> > > Hi:
> > > 
> > > Per request from Michael and Jason, the metadata accelreation is
> > > reverted in this version and rework in next version.
> > > 
> > > Please review.
> > > 
> > > Thanks
> > > 
> > > Jason Wang (2):
> > >    Revert "vhost: access vq metadata through kernel virtual address"
> > >    vhost: re-introducing metadata acceleration through kernel virtual
> > >      address
> > There are a bunch of patches in the queue already that will help
> > vhost, and I a working on one for next cycle that will help alot more
> > too.
> 
> 
> I will check those patches, but if you can give me some pointers or keywords
> it would be much appreciated.

You can look here:

https://github.com/jgunthorpe/linux/commits/mmu_notifier

The first parts, the get/put are in the hmm tree, and the last part,
the interval tree in the last commit is still a WIP, but it would
remove alot of that code from vhost as well.

Jason