linux-kernel - Re: [PATCH 00/10] HMM updates for 5.1

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Date:   Wed, 13 Mar 2019 18:01:33 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Jerome Glisse <jglisse@...hat.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Christian König <christian.koenig@....com>,
        Ralph Campbell <rcampbell@...dia.com>,
        John Hubbard <jhubbard@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH 00/10] HMM updates for 5.1

On Wed, Mar 13, 2019 at 09:10:04AM -0700, Andrew Morton wrote:
> On Tue, 12 Mar 2019 21:27:06 -0400 Jerome Glisse <jglisse@...hat.com> wrote:
> 
> > Andrew you will not be pushing this patchset in 5.1 ?
> 
> I'd like to.  It sounds like we're converging on a plan.
> 
> It would be good to hear more from the driver developers who will be
> consuming these new features - links to patchsets, review feedback,
> etc.  Which individuals should we be asking?  Felix, Christian and
> Jason, perhaps?

At least the Mellanox driver patch looks like a good improvement:

https://patchwork.kernel.org/patch/10786625/
 5 files changed, 202 insertions(+), 452 deletions(-)

In fact it hollows out the 'umem_odp' driver abstraction we already
had in the RDMA core.

So, I fully expect to see this API used in mlx5 and RDMA-core after it
is merged.

We've done some testing now, and there are still some outstanding
questions on the driver parts, but I haven't seen anything
fundamentally wrong with HMM mirror come up.

Jason