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

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Message-ID: <20190319174552.GA3769@redhat.com>
Date:   Tue, 19 Mar 2019 13:45:52 -0400
From:   Jerome Glisse <jglisse@...hat.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <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>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Alex Deucher <alexander.deucher@....com>
Subject: Re: [PATCH 00/10] HMM updates for 5.1

On Tue, Mar 19, 2019 at 10:33:57AM -0700, Dan Williams wrote:
> On Tue, Mar 19, 2019 at 10:19 AM Jerome Glisse <jglisse@...hat.com> wrote:
> >
> > On Tue, Mar 19, 2019 at 10:12:49AM -0700, Andrew Morton wrote:
> > > On Tue, 19 Mar 2019 12:58:02 -0400 Jerome Glisse <jglisse@...hat.com> wrote:
> [..]
> > > Also, the discussion regarding [07/10] is substantial and is ongoing so
> > > please let's push along wth that.
> >
> > I can move it as last patch in the serie but it is needed for ODP RDMA
> > convertion too. Otherwise i will just move that code into the ODP RDMA
> > code and will have to move it again into HMM code once i am done with
> > the nouveau changes and in the meantime i expect other driver will want
> > to use this 2 helpers too.
> 
> I still hold out hope that we can find a way to have productive
> discussions about the implementation of this infrastructure.
> Threatening to move the code elsewhere to bypass the feedback is not
> productive.

I am not threatening anything that code is in ODP _today_ with that
patchset i was factering it out so that i could also use it in nouveau.
nouveau is built in such way that right now i can not use it directly.
But i wanted to factor out now in hope that i can get the nouveau
changes in 5.2 and then convert nouveau in 5.3.

So when i said that code will be in ODP it just means that instead of
removing it from ODP i will keep it there and it will just delay more
code sharing for everyone.


> 
> >
> > >
> > > What is the review/discussion status of "[PATCH 09/10] mm/hmm: allow to
> > > mirror vma of a file on a DAX backed filesystem"?
> >
> > I explained that this is needed for the ODP RDMA convertion as ODP RDMA
> > does supported DAX today and thus i can not push that convertion without
> > that support as otherwise i would regress RDMA ODP.
> >
> > Also this is to be use by nouveau which is upstream and there is no
> > reasons to not support vma that happens to be mmap of a file on a file-
> > system that is using a DAX block device.
> >
> > I do not think Dan had any comment code wise, i think he was complaining
> > about the wording of the commit not being clear and i proposed an updated
> > wording that he seemed to like.
> 
> Yes, please resend with the updated changelog and I'll ack.