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[209.132.183.28]) by mx.google.com with ESMTPS id j14si1159025qta.106.2019.03.06.07.49.07 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Mar 2019 07:49:08 -0800 (PST) Received-SPF: pass (google.com: domain of jglisse@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of jglisse@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=jglisse@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 2141B3092653; Wed, 6 Mar 2019 15:49:07 +0000 (UTC) Received: from redhat.com (ovpn-125-142.rdu2.redhat.com [10.10.125.142]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 27B3C611B6; Wed, 6 Mar 2019 15:49:06 +0000 (UTC) Date: Wed, 6 Mar 2019 10:49:04 -0500 From: Jerome Glisse To: Andrew Morton Cc: Dan Williams , Linux MM , Linux Kernel Mailing List , Ralph Campbell , John Hubbard , linux-fsdevel Subject: Re: [PATCH 09/10] mm/hmm: allow to mirror vma of a file on a DAX backed filesystem Message-ID: <20190306154903.GA3230@redhat.com> References: <20190129212150.GP3176@redhat.com> <20190130030317.GC10462@redhat.com> <20190130183616.GB5061@redhat.com> <20190131041641.GK5061@redhat.com> <20190305141635.8134e310ba7187bc39532cd3@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20190305141635.8134e310ba7187bc39532cd3@linux-foundation.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Wed, 06 Mar 2019 15:49:07 +0000 (UTC) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Mar 05, 2019 at 02:16:35PM -0800, Andrew Morton wrote: > On Wed, 30 Jan 2019 21:44:46 -0800 Dan Williams wrote: > > > > > > > > Another way to help allay these worries is commit to no new exports > > > > without in-tree users. In general, that should go without saying for > > > > any core changes for new or future hardware. > > > > > > I always intend to have an upstream user the issue is that the device > > > driver tree and the mm tree move a different pace and there is always > > > a chicken and egg problem. I do not think Andrew wants to have to > > > merge driver patches through its tree, nor Linus want to have to merge > > > drivers and mm trees in specific order. So it is easier to introduce > > > mm change in one release and driver change in the next. This is what > > > i am doing with ODP. Adding things necessary in 5.1 and working with > > > Mellanox to have the ODP HMM patch fully tested and ready to go in > > > 5.2 (the patch is available today and Mellanox have begin testing it > > > AFAIK). So this is the guideline i will be following. Post mm bits > > > with driver patches, push to merge mm bits one release and have the > > > driver bits in the next. I do hope this sound fine to everyone. > > > > The track record to date has not been "merge HMM patch in one release > > and merge the driver updates the next". If that is the plan going > > forward that's great, and I do appreciate that this set came with > > driver changes, and maintain hope the existing exports don't go > > user-less for too much longer. > > Decision time. Jerome, how are things looking for getting these driver > changes merged in the next cycle? nouveau is merge already. > > Dan, what's your overall take on this series for a 5.1-rc1 merge? > > Jerome, what would be the risks in skipping just this [09/10] patch? As nouveau is a new user it does not regress anything but for RDMA mlx5 (which i expect to merge new window) it would regress that driver. Cheers, Jérôme