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 CB89BC83000 for ; Wed, 29 Apr 2020 00:26:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A5ADC20737 for ; Wed, 29 Apr 2020 00:26:17 +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 S1726401AbgD2A0R (ORCPT ); Tue, 28 Apr 2020 20:26:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42878 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726355AbgD2A0R (ORCPT ); Tue, 28 Apr 2020 20:26:17 -0400 Received: from mail-lj1-x241.google.com (mail-lj1-x241.google.com [IPv6:2a00:1450:4864:20::241]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F053C03C1AD for ; Tue, 28 Apr 2020 17:26:16 -0700 (PDT) Received: by mail-lj1-x241.google.com with SMTP id u15so789594ljd.3 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=Jkl5Gs3MlEgiT2KDk+vkXKW9jp2fXbahryxTmCKj+C+FuqzGxhz/K4tqrsoPEPmQ68 KH0c6W2BsKZgfLTuyV9riiYwV4vg2RkggpVm/WDOaW1s9cei8mgBofDDGJUOhxfLADjO 26L2GaoLFtb3QJ5FMDvFbUquL4o1Z07cv3ZI6Jr5BG6yFG0OeLVowA8DfRaBxeiUkjDm xGejIUljEUedsyAi7/emFksufaoxcJsexR2s+1tIpuBQ7/eHplimI/vONGcPdEufunXY qPX2K+V33T5k71Qs/JmqT9S15jWQQ+pWta/e311w6t29uGy5nP8Pn08ePiY7NVp0bpqR 8xCw== X-Gm-Message-State: AGi0PuamaIxtJkSOPi3x6WEaqQwAuGxSseYgSUJvC1bO5/9cR+qSsvBg LUog8pLDVmWOo49T6QHnnOYPkA== 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-m68k-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-m68k@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