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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 2DA52C433DB for ; Fri, 15 Jan 2021 19:53:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D658023877 for ; Fri, 15 Jan 2021 19:53:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388126AbhAOTxp (ORCPT ); Fri, 15 Jan 2021 14:53:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726410AbhAOTxn (ORCPT ); Fri, 15 Jan 2021 14:53:43 -0500 Received: from mail-qv1-xf2e.google.com (mail-qv1-xf2e.google.com [IPv6:2607:f8b0:4864:20::f2e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 67290C061757 for ; Fri, 15 Jan 2021 11:53:03 -0800 (PST) Received: by mail-qv1-xf2e.google.com with SMTP id a1so4535025qvd.13 for ; Fri, 15 Jan 2021 11:53:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=YOccbbRfNSMXCGHDICvlCYRLO57HHlYqke/K97gEpqY=; b=Vmi+u5PnGq6QrC1+HQaWL+Z9MasdSmvK4regdUEaYNDa3KpJZeZ428RDXeJ9sECCO+ M9AcotGIPwNygQxluD0kcNW7qLMofiOdCClq8ak6Rvgq39cQwjWF2dJjOTjRXluBVZea duIg9VogrWWguzhAcMogxS3yK4+OnM1uacXpRMnuCtQodaVSUz4JpZaAi3eut8v4r4uw lQh1tQlSHl+SzlgtaJYhoapjFIFkbSsAgBDJmRIy3bmSwk7EIIJhYy8VJ4DaUh77foP/ SNhwo3ld4KVHCbVWNOVvOQerm1h8fkks/sNEJ3phQB52K5Rk7WjazRMk0GzkYZvmnLj4 iEOw== 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=YOccbbRfNSMXCGHDICvlCYRLO57HHlYqke/K97gEpqY=; b=kCBeUNn3MYqc2wNCE2BVwa/+ad5S7Nl74AU7meI/wDakJbQKJAgURgGN3yFdjK/rZP ckVutupbhK1UtoDLYGcxaFx0Q16AOjPqsUxaujy0Za3kZhZ1ewbu6uwwut8ieRkxul9A jI+S+nzCm2Fc24DApe6CMrdMSp18ewBw44Cbj0fi9633zLSW3Qk0a/Kw/u9CiJFlkCTO mX+uyfdyt6BpqqmwVMR0iHers2yukOnipMR2Wze8JZSE2CfH3y25s2KZ9U/DnL5PDTIS cUsJ9LJxbyfp6r2+qOIYehubbpQ9noN5SxznCe/bCejexyE09V6VbxWJrBcxJOxsGgjZ wcGA== X-Gm-Message-State: AOAM532NVyMrQiwAoTFSFvMnVY14QHIS4f2Qe115viVrXEMmekznLb7l H01+1YkbTucsfnDT6p13FKQm7g== X-Google-Smtp-Source: ABdhPJxriPVEn+gJbENVTGxzVi7zq0Loc9XYuq8r8ugANKBL+YABpxLTdVL2mVhCv6OgltIqedZo+g== X-Received: by 2002:ad4:452f:: with SMTP id l15mr13829167qvu.49.1610740382661; Fri, 15 Jan 2021 11:53:02 -0800 (PST) Received: from ziepe.ca (hlfxns017vw-142-162-115-133.dhcp-dynamic.fibreop.ns.bellaliant.net. [142.162.115.133]) by smtp.gmail.com with ESMTPSA id c49sm603116qta.89.2021.01.15.11.53.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Jan 2021 11:53:02 -0800 (PST) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1l0V9Z-0022NF-Ib; Fri, 15 Jan 2021 15:53:01 -0400 Date: Fri, 15 Jan 2021 15:53:01 -0400 From: Jason Gunthorpe To: David Hildenbrand Cc: Andrea Arcangeli , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Yu Zhao , Andy Lutomirski , Peter Xu , Pavel Emelyanov , Mike Kravetz , Mike Rapoport , Minchan Kim , Will Deacon , Peter Zijlstra , Linus Torvalds , Hugh Dickins , "Kirill A. Shutemov" , Matthew Wilcox , Oleg Nesterov , Jann Horn , Kees Cook , John Hubbard , Leon Romanovsky , Jan Kara , Kirill Tkhai , Nadav Amit , Jens Axboe Subject: Re: [PATCH 0/1] mm: restore full accuracy in COW page reuse Message-ID: <20210115195301.GI4605@ziepe.ca> References: <20210110004435.26382-1-aarcange@redhat.com> <20210115183721.GG4605@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jan 15, 2021 at 08:46:48PM +0100, David Hildenbrand wrote: > Just wild ideas. Most probably that has already been discussed, and most > probably people figured that it's impossible :) No, I think it is all fair topics. There is no API reason for any of this to be limited, but in practice, I doubt there is more than small 10's Huge pages complicate things of course Jason