From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ot0-f198.google.com (mail-ot0-f198.google.com [74.125.82.198]) by kanga.kvack.org (Postfix) with ESMTP id AD08C280263 for ; Tue, 16 Jan 2018 21:05:07 -0500 (EST) Received: by mail-ot0-f198.google.com with SMTP id d25so11479662otc.1 for ; Tue, 16 Jan 2018 18:05:07 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id b19si1319589oii.311.2018.01.16.18.05.06 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 16 Jan 2018 18:05:06 -0800 (PST) Date: Tue, 16 Jan 2018 21:05:02 -0500 From: Jerome Glisse Subject: Re: [LSF/MM TOPIC] HMM status upstream user what's next, mmu_notifier Message-ID: <20180117020502.GA3492@redhat.com> References: <20180116213008.GC8801@redhat.com> <97e9fc59-0fc9-2c53-2713-6195f0375afe@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <97e9fc59-0fc9-2c53-2713-6195f0375afe@huawei.com> Sender: owner-linux-mm@kvack.org List-ID: To: "Liubo(OS Lab)" Cc: lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org, Anshuman Khandual , Balbir Singh , David Rientjes , John Hubbard , Michal Hocko On Wed, Jan 17, 2018 at 09:19:56AM +0800, Liubo(OS Lab) wrote: > On 2018/1/17 5:30, Jerome Glisse wrote: > > I want to talk about status of HMM and respective upstream user for > > it and also talk about what's next in term of features/improvement > > plan (generic page write protection, mmu_notifier, ...). Most likely > > I don't think we should consider to push more code to upstream for a nobody-use feature. > > AFAIR, Michal also mentioned that HMM need a real user/driver before upstream. > But I haven't seen a workable user/driver version. > > Looks like HMM is a custom framework for Nvidia, and Nvidia would not like to open source its driver. > Even if nvidia really use HMM and open sourced its driver, it's probably the only user. > But the HMM framework touched too much core mm code. So it is not NVidia only, they are other GPU from different company that intend to use HMM, i can't comment any further on timeline. Regarding NVidia hardware i intend to have the patchset to use HMM inside nouveau ready before summit and post as RFC. Per drm sub-system guideline we can not upstream it until we also have a functional userspace stack and we are also working on that. Cheers, Jerome -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org