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 X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 86B21C83004 for ; Wed, 29 Apr 2020 00:26:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5EB6220737 for ; Wed, 29 Apr 2020 00:26:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=shutemov-name.20150623.gappssmtp.com header.i=@shutemov-name.20150623.gappssmtp.com header.b="aVXs13fu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726495AbgD2A0R (ORCPT ); Tue, 28 Apr 2020 20:26:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42876 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726348AbgD2A0R (ORCPT ); Tue, 28 Apr 2020 20:26:17 -0400 Received: from mail-lj1-x243.google.com (mail-lj1-x243.google.com [IPv6:2a00:1450:4864:20::243]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 86DFCC03C1AC for ; Tue, 28 Apr 2020 17:26:16 -0700 (PDT) Received: by mail-lj1-x243.google.com with SMTP id g4so796127ljl.2 for ; Tue, 28 Apr 2020 17:26:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=/HiSUgy4HdIvWLjYuum+TqzLflqanBrj+3DX557LOi8=; b=aVXs13fuMD8tYTcF8jNfrLhu5ML+wQppMSZ7gwhyeur8B4kC35c5nL0lRaXBfd/aOZ Jaq0kP7S16Pzx9p7MRhsx6rGf1LDQeSkACLd6PxCA+6H9QvnpMUKmNGmRW7Wlsd10n+Y yKHmpMdNW/bjIOMOkcIXwVazU39dU4xjmdYZGL87YfPZ9DJtmU5NpgBCws4ORuPIQwJM JZ2DUtPZbFi9IaPFPG09SDx1Hs0kqJfmmM/b5Bf+VWM7SSSB5Xu5GTnekJP4nGpTU1+Z YrWpsRK/K7WUzonyRkIdQF5Wvb9WiCDBPCGvqYi5KGv5gfQkONF5wiCCckmOPskLBjbe o82w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=/HiSUgy4HdIvWLjYuum+TqzLflqanBrj+3DX557LOi8=; b=KhP7j85faYYGxe9mFhh9RE4TIh4LV1dveYOoBZbrsNnXOUqi0KnEbOulFKl8QJhtZ9 9g2TNHPJGGltugmh0mBnUNxhzawWD9LAgyBwqSrop0eVACxeaJ3f0RwoH4jhHOvb9i45 MDzAjZOK18dUx7nWXbpE3sVnPQoAwwDCLk+H5xwhf33lzfv5kyYSZmrluaJwP8P7jAlK sx193jBvL1pbhZNUUKZN9eZOhAXTLULr/Pkbu+7PjY3H/D4XYx36wXKlbxeDmWTU5DKy R2Css9EEFsEnNW4aQk64tyR5rll9txictGHWO2ukOLOfnqn8fQSauw2JiGVgzIiAvsFS Sp8g== X-Gm-Message-State: AGi0PuYPgqCFeXiGhskaP+ee9GCEypHeyjip7r5nMsrEDpUzthyo8ox2 zaDpuuDj/ilZo//j7HbUexcSPw== X-Google-Smtp-Source: APiQypL3wQKxt8REUfc+hl2eNZBwnCv5lA2SH5VyZm8esm2T3qhBylMrbIltlQMzNtSsO3KNfKA7JA== X-Received: by 2002:a05:651c:28c:: with SMTP id b12mr18799069ljo.167.1588119974899; Tue, 28 Apr 2020 17:26:14 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id b73sm835023lfg.86.2020.04.28.17.26.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Apr 2020 17:26:14 -0700 (PDT) Received: by box.localdomain (Postfix, from userid 1000) id F06BE10235A; Wed, 29 Apr 2020 03:26:24 +0300 (+03) Date: Wed, 29 Apr 2020 03:26:24 +0300 From: "Kirill A. Shutemov" To: Matthew Wilcox Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Will Deacon , Catalin Marinas , Russell King , Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org Subject: Re: [PATCH 0/7] Record the mm_struct in the page table pages Message-ID: <20200429002624.qkhb362moj6v3vtw@box> References: <20200428194449.22615-1-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200428194449.22615-1-willy@infradead.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Apr 28, 2020 at 12:44:42PM -0700, Matthew Wilcox wrote: > From: "Matthew Wilcox (Oracle)" > > Pages which are in use as page tables have some space unused in struct > page. It would be handy to have a pointer to the struct mm_struct that > they belong to so that we can handle uncorrectable errors in page tables > more gracefully. There are a few other things we could use it for too, > such as checking that the page table entry actually belongs to the task > we think it ought to. This patch series does none of that, but does > lay the groundwork for it. > > Matthew Wilcox (Oracle) (7): How does it work for kernel side of virtual address space? And your employer may be interested in semantics around CONFIG_ARCH_WANT_HUGE_PMD_SHARE :P -- Kirill A. Shutemov 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 X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C8CCC83000 for ; Wed, 29 Apr 2020 00:26:24 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 683F220737 for ; Wed, 29 Apr 2020 00:26:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Dt78nIqI"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=shutemov-name.20150623.gappssmtp.com header.i=@shutemov-name.20150623.gappssmtp.com header.b="aVXs13fu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 683F220737 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=shutemov.name Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=2GdlLTKSTBJjhRKsZ5HjxFpBlwLv0ofsxZWeq0kW5f0=; b=Dt78nIqIU3e5VG ESL3J7HoPZtVNJ97rmlG/mqluQTxAwXIt/LwIMHSeAkmqbxRlnSF3M6HruDRXcTM01uMLe1V11tAT b2b/jbuhY3xv/OGl1kbjKPCyKFU6SJBeuNcMuC3ZspbW2SFOxZufSCQsL8EunIAixwGzfdDFmFv2l fjXqhGYb0lcEcv+uZhcLfWUDVKPNAeKSP+vZfkS1W2n673pcICRot2mLpN1PWYo43I8+bYmdoqO8j PmEpuX09hGrQOKBDX597ZVb/mvKRZRzO5F8vylfqAeUYxTcrrtU2/H3bb2eB/VPK+YSLfTGfaJ+MO BA4xEhv9q93PgRDiYKIg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jTaYO-0004OH-0u; Wed, 29 Apr 2020 00:26:20 +0000 Received: from mail-lj1-x242.google.com ([2a00:1450:4864:20::242]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jTaYL-0004Nj-9d for linux-arm-kernel@lists.infradead.org; Wed, 29 Apr 2020 00:26:18 +0000 Received: by mail-lj1-x242.google.com with SMTP id h4so725234ljg.12 for ; Tue, 28 Apr 2020 17:26:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=/HiSUgy4HdIvWLjYuum+TqzLflqanBrj+3DX557LOi8=; b=aVXs13fuMD8tYTcF8jNfrLhu5ML+wQppMSZ7gwhyeur8B4kC35c5nL0lRaXBfd/aOZ Jaq0kP7S16Pzx9p7MRhsx6rGf1LDQeSkACLd6PxCA+6H9QvnpMUKmNGmRW7Wlsd10n+Y yKHmpMdNW/bjIOMOkcIXwVazU39dU4xjmdYZGL87YfPZ9DJtmU5NpgBCws4ORuPIQwJM JZ2DUtPZbFi9IaPFPG09SDx1Hs0kqJfmmM/b5Bf+VWM7SSSB5Xu5GTnekJP4nGpTU1+Z YrWpsRK/K7WUzonyRkIdQF5Wvb9WiCDBPCGvqYi5KGv5gfQkONF5wiCCckmOPskLBjbe o82w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=/HiSUgy4HdIvWLjYuum+TqzLflqanBrj+3DX557LOi8=; b=jKja+gRA9QKQ9ZNYNXoKYnzj4PS+qxUZ2OdWpzdau3meOKhlLa/c8jKU/xJ4iW8/nE w1AlU8VM/xRmkQyU4EC2czmeAZj9ALVI6VedkbcpOUh50xeSbGIcVvxRSG0u/hOhoING k/jQ2Zp4v+9OyGAFgK1Y3xIQEBF+2RaAczU5atff6XJ7Q3vx5P2Q0QEr54pF/khzytZC Uq/Bl4q4SsgNE05SuIXUSc2Yl4kOERy8zdIup81l8DZ/hNShfG9aOdH/vDxaY7Pwr3rw MGIV2vE9DTlbtBijfRGVLXkx+z85IaeBdFW8pC8A00KcFshVSdPAaikobpeUUzB+m2eP ggMQ== X-Gm-Message-State: AGi0PuYNC3Wa9RgHnZ93KWK+q+N1SnHxwpXpUHCY673jH3F1QtPSvrY2 7p10mudkSHgE196Ed/eOOcC8xoyf08U= X-Google-Smtp-Source: APiQypL3wQKxt8REUfc+hl2eNZBwnCv5lA2SH5VyZm8esm2T3qhBylMrbIltlQMzNtSsO3KNfKA7JA== X-Received: by 2002:a05:651c:28c:: with SMTP id b12mr18799069ljo.167.1588119974899; Tue, 28 Apr 2020 17:26:14 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id b73sm835023lfg.86.2020.04.28.17.26.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Apr 2020 17:26:14 -0700 (PDT) Received: by box.localdomain (Postfix, from userid 1000) id F06BE10235A; Wed, 29 Apr 2020 03:26:24 +0300 (+03) Date: Wed, 29 Apr 2020 03:26:24 +0300 From: "Kirill A. Shutemov" To: Matthew Wilcox Subject: Re: [PATCH 0/7] Record the mm_struct in the page table pages Message-ID: <20200429002624.qkhb362moj6v3vtw@box> References: <20200428194449.22615-1-willy@infradead.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200428194449.22615-1-willy@infradead.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200428_172617_360713_59D04373 X-CRM114-Status: GOOD ( 12.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , Russell King , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-m68k@lists.linux-m68k.org, Geert Uytterhoeven , Will Deacon , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Apr 28, 2020 at 12:44:42PM -0700, Matthew Wilcox wrote: > From: "Matthew Wilcox (Oracle)" > > Pages which are in use as page tables have some space unused in struct > page. It would be handy to have a pointer to the struct mm_struct that > they belong to so that we can handle uncorrectable errors in page tables > more gracefully. There are a few other things we could use it for too, > such as checking that the page table entry actually belongs to the task > we think it ought to. This patch series does none of that, but does > lay the groundwork for it. > > Matthew Wilcox (Oracle) (7): How does it work for kernel side of virtual address space? And your employer may be interested in semantics around CONFIG_ARCH_WANT_HUGE_PMD_SHARE :P -- Kirill A. Shutemov _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel