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[216.194.73.131]) by smtp.gmail.com with ESMTPSA id gz24-20020a17090b0ed800b00263c8b33bcfsm2234333pjb.14.2023.07.03.14.29.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Jul 2023 14:29:37 -0700 (PDT) Received: from jgg by jggl with local (Exim 4.95) (envelope-from ) id 1qGR72-000BQ9-Bm; Mon, 03 Jul 2023 18:29:36 -0300 Date: Mon, 3 Jul 2023 18:29:36 -0300 From: Jason Gunthorpe To: Claudio Imbrenda Cc: Hugh Dickins , Andrew Morton , Gerald Schaefer , Vasily Gorbik , Mike Kravetz , Mike Rapoport , "Kirill A. Shutemov" , Matthew Wilcox , David Hildenbrand , Suren Baghdasaryan , Qi Zheng , Yang Shi , Mel Gorman , Peter Xu , Peter Zijlstra , Will Deacon , Yu Zhao , Alistair Popple , Ralph Campbell , Ira Weiny , Steven Price , SeongJae Park , Lorenzo Stoakes , Huang Ying , Naoya Horiguchi , Christophe Leroy , Zack Rusin , Axel Rasmussen , Anshuman Khandual , Pasha Tatashin , Miaohe Lin , Minchan Kim , Christoph Hellwig , Song Liu , Thomas Hellstrom , Russell King , "David S. Miller" , Michael Ellerman , "Aneesh Kumar K.V" , Heiko Carstens , Christian Borntraeger , Alexander Gordeev , Jann Horn , Vishal Moola , Vlastimil Babka , linux-arm-kernel@lists.infradead.org, sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 07/12] s390: add pte_free_defer() for pgtables sharing page Message-ID: References: <54cb04f-3762-987f-8294-91dafd8ebfb0@google.com> <20230630153852.31163592@p-imbrenda> <062b19-4cf1-261-a9bf-9cefd32382fc@google.com> <20230630182556.7727ef50@p-imbrenda> <7f6d399b-c47-1faa-f7f6-9932b9811f8c@google.com> <20230703130013.559217c9@p-imbrenda> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230703130013.559217c9@p-imbrenda> X-Rspamd-Queue-Id: 700DF40009 X-Rspam-User: X-Stat-Signature: tfakiemhikzxaaaw83hts8a4gs7za89u X-Rspamd-Server: rspam03 X-HE-Tag: 1688419778-795986 X-HE-Meta: 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 uPVLkU4c Khcs3xuH88PxvpN9UjhNOSCCw/JHinmLPug9NWy565v7ETQUNR7KhQy4pyzI2Icif4qyZDpUEW5N3zvN/xfUDsAda92whJ0cxL+ecZ376GejBVFspt13RuTPfsCZ8HGr7I3d4ycCxM/PS8GUUqDfVyE4kWXsNEJH/IuOFppW6yh5aD2TI57d0NikSvrjd+NtXXhx1kHUZoWAC0XEF4mnurU5cFLxA7PWG25REy78l63UoWllSQs/SLAXvrKYre129j5InyAS1ovzE7FpyfezkhG+0xv+zH2943L8qCx4aGVZtlgAZQmX4437zlGLazYivDDKHC3rP6m40Wz84FjIxDBPl1alS2SI4AXCbeldq5LpJ0PwSAt3V3KGD0cqBnLDlrle1RTdo4W7uMeRe5H8UA4XBKLCTDZ+Um8sytNOKq7U7OHAZxbysoiIBXFnZfzidOGDnp97ygq5s2Bc= 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 Mon, Jul 03, 2023 at 01:00:13PM +0200, Claudio Imbrenda wrote: > On Fri, 30 Jun 2023 12:22:43 -0700 (PDT) > Hugh Dickins wrote: > > [...] > > > That's something I would have expected to be handled already via > > mmu_notifiers, rather than buried inside the page table freeing. > > > > If s390 is the only architecture to go that way, and could instead do > > it via mmu_notifiers, then I think that will be more easily supported > > in the long term. > > I am very well aware of that, and in fact I've been working on > exactly that for some time already. But it's a very complex minefield > and therefore I'm proceeding *very* carefully. It will take quite some > time before anything comes out. Yes +1 on this please, creating your own arch cross connect with kvm in the page table freers is really horrible.. Jason