From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BA978C001B1 for ; Mon, 3 Jul 2023 21:29:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230419AbjGCV3m (ORCPT ); Mon, 3 Jul 2023 17:29:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230384AbjGCV3k (ORCPT ); Mon, 3 Jul 2023 17:29:40 -0400 Received: from mail-pj1-x1036.google.com (mail-pj1-x1036.google.com [IPv6:2607:f8b0:4864:20::1036]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ED70BE69 for ; Mon, 3 Jul 2023 14:29:38 -0700 (PDT) Received: by mail-pj1-x1036.google.com with SMTP id 98e67ed59e1d1-262d33fa37cso2345891a91.3 for ; Mon, 03 Jul 2023 14:29:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1688419778; x=1691011778; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=5dg0Gj8viEWfIWcxIZc6iyfyM+TCYwvws/9N3ezb+Z4=; b=ciMHCgEytyQpXiLlKqi3gz/v7Q2CHhYlXp9swK68CxESaRga14VO+v3ioFdBXsYDLs rcJstbloCFNhdyL8erhHWR7+k/2G2ZmekQkHOlLD+CHVeKnxlVQEAYi4thVU88jUmlqP j3AGFkPfvugYcv6dCmSAzMJAAyhg1ABHOGQ6MaLAdsnWWMIo4JB8NFzrMsH4cg3S6MEo u2Zcz5D9ARgll/H+oBV/djEHlDDqEHh/6LiwiUjnMih7ZCbaZjvFAg4+P4L6MdepK6me Bll7SIw/4ovRaQDEUVlzPsNcEFS/MXpYuVmlTSmCre5BrbjEKllFu+L2hZxsC8HgQV9B IGig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1688419778; x=1691011778; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=5dg0Gj8viEWfIWcxIZc6iyfyM+TCYwvws/9N3ezb+Z4=; b=dW7p6a010I9FcOIiGQdNj0XLiL9EMWFnXoVKFIp+vWHdAggMJratqjjjdrXJQNk0HY BslMAg7nN9OsEXmrEGke8/8f9WII/M5jU1UFF0X1/Q+qxKvk63Bc6W3gPFDt/eV1mNNQ QjBUI3eCf3ABxt3SQ3IgvjC4/ZbmMen4q3Wq7MBYxDSn2WBGWEyRvbV0gEzTnEjAYLDq 6X4DIGU+1er9c+C8o8LxfoMy1PbHzxNCP0grRMsfzYUAHL7CMRtTW08hFwRbz6QgWRRz Wv+8z4F80cfGQa63p06ql0Vcm/9gjMnW6VzHugCrMGYmWTWiB+MoqIUukFaNronMb0fI 8PLA== X-Gm-Message-State: ABy/qLZdA1IG/L4Nf62Cx5F0sv4ITYgBljN+ckd42Jxtlt0HJ0djKWdc tPWdSWYC/rHs/v25IIM/5mOrVQ== X-Google-Smtp-Source: APBJJlE0dK/ixgJCjZM8BVxtoBqxR3hYidUzDYcxy89uMsoxRbB7avUM4k+kl/Tzd5k23OlP0AX/hg== X-Received: by 2002:a17:90a:1b02:b0:263:7d55:de2e with SMTP id q2-20020a17090a1b0200b002637d55de2emr9149088pjq.9.1688419778192; Mon, 03 Jul 2023 14:29:38 -0700 (PDT) Received: from ziepe.ca (ip-216-194-73-131.syban.net. [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> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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