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 BBD98C43334 for ; Wed, 20 Jul 2022 19:15:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230401AbiGTTPx (ORCPT ); Wed, 20 Jul 2022 15:15:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54160 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229579AbiGTTPv (ORCPT ); Wed, 20 Jul 2022 15:15:51 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 74B7431354 for ; Wed, 20 Jul 2022 12:15:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1658344548; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=rgr6tBel5eS7x9CZwqZNQr12OSq9bS7PlstJEoUtG4Q=; b=VPgpuvm+eLRXJLQowbNMm6MlYXUM2sfYaid+xn9Z2sXoPFEQcl9ZEGYziyfXgOp7qeZSUG NmWst+Y01Q9HSbTiT8CySCOixkDkt1Q6eQ5oolm63s7gQbi7MA/vy78fzBcVOsDwaSLbQe 2p5ucUvmWRyCB9IrT04WnwcL/w0wk9I= Received: from mail-qv1-f69.google.com (mail-qv1-f69.google.com [209.85.219.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-584-TNb-dY20PjiOnKGGRQJ8_Q-1; Wed, 20 Jul 2022 15:15:47 -0400 X-MC-Unique: TNb-dY20PjiOnKGGRQJ8_Q-1 Received: by mail-qv1-f69.google.com with SMTP id q4-20020a0ce9c4000000b00473004919ddso10030730qvo.16 for ; Wed, 20 Jul 2022 12:15:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=rgr6tBel5eS7x9CZwqZNQr12OSq9bS7PlstJEoUtG4Q=; b=1Ksu4CnD9X9K5cfFnP0RIplF+1TkTrJxNN9ZwKEyWGXFAPopydiPdkeCBuxY61bwms 6/2ueiQvhTOM0iCFPJliS3NjZ0t/K2eS5EQ7jSXxCCjUKqX928RaHtNdSvRAs+OJ09S3 38vNhhXg8MHm4dxMV0+Qj4dp7Nui7is+MNEVJXSHMB6ME/oZsZKQRnIqFFXNP+bnkzu/ pG85pDdRmMcRQ5vr0rd8GTvnJRmp9u8AVaCsDgvU/j1b9pOrIyCSywveBTQN3dMJAdF2 QOHRl9fB9iJu9s1U4YL0Ex67g8BmORQ45aYgerOTMqQjOLDo6/7osWfeHxawGdeCYHOQ tt2Q== X-Gm-Message-State: AJIora8Od937ZfmWNnyK+22jsEPSyWGQ6izfQ6MuYayJg5deyDsu8vXC 78GctlG4C958nap6n/7e5icVxUWvyObwVy6wtAqJ7XpwjkGtZf/s/rWC2kRjI1a18BTELZAjFFt 5EzVoVvtBckLhILuw5vFAaP/R X-Received: by 2002:a05:622a:143:b0:31e:9c61:c1d7 with SMTP id v3-20020a05622a014300b0031e9c61c1d7mr29315915qtw.128.1658344546839; Wed, 20 Jul 2022 12:15:46 -0700 (PDT) X-Google-Smtp-Source: AGRyM1tS8bxsQFfmgmIDJi+MSRJhX0yI039P0+Aey5gXr4aFl2IBE6wVL3S96bkcDl4j9uow306Z/Q== X-Received: by 2002:a05:622a:143:b0:31e:9c61:c1d7 with SMTP id v3-20020a05622a014300b0031e9c61c1d7mr29315883qtw.128.1658344546559; Wed, 20 Jul 2022 12:15:46 -0700 (PDT) Received: from xz-m1.local (bras-base-aurron9127w-grc-37-74-12-30-48.dsl.bell.ca. [74.12.30.48]) by smtp.gmail.com with ESMTPSA id bj30-20020a05620a191e00b006b59f02224asm8568940qkb.60.2022.07.20.12.15.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Jul 2022 12:15:45 -0700 (PDT) Date: Wed, 20 Jul 2022 15:15:44 -0400 From: Peter Xu To: David Hildenbrand Cc: Nadav Amit , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , Mike Rapoport , Axel Rasmussen , Nadav Amit , Andrea Arcangeli , Andrew Cooper , Andy Lutomirski , Dave Hansen , Peter Zijlstra , Thomas Gleixner , Will Deacon , Yu Zhao , Nick Piggin Subject: Re: [RFC PATCH 01/14] userfaultfd: set dirty and young on writeprotect Message-ID: References: <20220718120212.3180-1-namit@vmware.com> <20220718120212.3180-2-namit@vmware.com> <017facf0-7ef8-3faf-138d-3013a20b37db@redhat.com> <2b4393ce-95c9-dd3e-8495-058a139e771e@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <2b4393ce-95c9-dd3e-8495-058a139e771e@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 20, 2022 at 05:10:37PM +0200, David Hildenbrand wrote: > For pagecache pages it may as well be *plain wrong* to bypass the write > fault handler and simply mark pages dirty+map them writable. Could you elaborate? -- Peter Xu