Received: by 2002:a05:6a11:4021:0:0:0:0 with SMTP id ky33csp4206305pxb; Mon, 27 Sep 2021 11:37:07 -0700 (PDT) X-Google-Smtp-Source: ABdhPJz0DK8KXA75BJIX5x4Fccqem/NPIqx96Bydi0VKo/U2nEqfPn7QJ7T2JYCwMPyvkegmpo/Z X-Received: by 2002:a17:906:d541:: with SMTP id cr1mr1779161ejc.81.1632767827626; Mon, 27 Sep 2021 11:37:07 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1632767827; cv=none; d=google.com; s=arc-20160816; b=o8tkniR1Kmnqz9uA1nXeysfRZXuHqG9nO5cX2/02Lz39Cq7qUWmJ/XThJ7U1d27AZ2 eFbsIlx6/VKFyMbH3ULPYvDWY0OKNm7iA24bf4cIAaEYOGVV8PDxBjjmYTBbxbVejF/b wKQAwJoLLtJYRvRdw6VxcxJDzcxn+MDCMRSmvWheXWKQBACObrGdOkD5L7LrHsND6P12 dFc19/s37mB7LwKdG8Iu2+NhnKwcjU+knVQRnG4oa/zv3niKmgIpvWEc6MywhgnQbrlj 8wppHjxwUiL2p3HtqeiT/+VnX7iu1F8dal+XCPT9nnLc6PCvI1eQlHPCg3zvk+ptNkc8 6E6Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:cc:to:subject:message-id:date:from:in-reply-to :references:mime-version:dkim-signature; bh=+jIsaeZxB9iIHx2Xlr4ffwG7DDOBE7KZeGUWD2K48eI=; b=FdEswNhBnPcdrv0DR+meLbQvoYi3P3sr9A31qQ+orpglTQ5c8JEElJhNpXtnk9JJe0 hUeNPKB8qOgjrGqZewbfQ3EAMhTBlx207uv5ScBrP0JEJyL2PSNUGT5LcRRerHID7Kxk 06P3Qujne/IxhDKIXG6Z3ITbCa/7KjybQ0WYJXJh6TUTwD9nHP/SYAJeDl3ATtvHfeea G/vkxotKOkgdMT+iWddmiUKPqvxNHe3/7FyUnJyHxckWH58WuVKyxq6XNe29myslcVGZ kbs2HaqWoQGaGoFGxIfWZ68wE9Q1+jhK0RAub9Iivkgk+GyfUNYDhdpjy+dIAGuhokaI 01CA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linux-foundation.org header.s=google header.b=DGnGiVsW; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id hq3si15144683ejc.142.2021.09.27.11.36.42; Mon, 27 Sep 2021 11:37:07 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linux-foundation.org header.s=google header.b=DGnGiVsW; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236222AbhI0Sgy (ORCPT + 99 others); Mon, 27 Sep 2021 14:36:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59480 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236129AbhI0Sgx (ORCPT ); Mon, 27 Sep 2021 14:36:53 -0400 Received: from mail-lf1-x132.google.com (mail-lf1-x132.google.com [IPv6:2a00:1450:4864:20::132]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E397C061575 for ; Mon, 27 Sep 2021 11:35:15 -0700 (PDT) Received: by mail-lf1-x132.google.com with SMTP id u18so80068606lfd.12 for ; Mon, 27 Sep 2021 11:35:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=+jIsaeZxB9iIHx2Xlr4ffwG7DDOBE7KZeGUWD2K48eI=; b=DGnGiVsWgNqibsS1Ab5nKqt7YSbGTS5Tcr0kHz7SyALq+hN2DJXB66SHS6HvDYU2RC wX6Jz58IJLYRva+k9kqC0ZdmYbOQu/f6gkWyrVI5GZXHj+f/rVDt+ctTpvanz5gi9wji /kiqtD3eiPtfH8Ab50k3VlieyRneSVxG+cw9U= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=+jIsaeZxB9iIHx2Xlr4ffwG7DDOBE7KZeGUWD2K48eI=; b=A/8L7q5Y4BHsIRFUKYPo9tyJaMzahESHUEk7S9ZFu/JKUMGPCzZz+EPEbcKd7B7v3K rZVYQ+XDUkwa2i5wbyRZJlTModuazn4wZH+CXeE5CWH8ZfL0wMMFSQT/DSbTvAC2YQWK H+Ys39jx1AlYMjmjilAiTAgimddPhpnHEFG4fJ7y8oCnonLZQwteNTE3vSBySe9WP0Uz //7BxV56lrNI/kADGCUcGQccrPmRFQV7aB6YTowMEvv9ABtw096uLc1PT55O1ciQ3mXm N5DyopiChprhYOeBQSP4FvS2biVTfU13hlDYq0Xds2icf6+WYBi0hBZeuQJLeiS0wOmN PTzw== X-Gm-Message-State: AOAM531e6Ik5ESqf8fSx6JWnjRWcKZ1H/hnIV7l0xQJza0skFROfKCnA VALS5tyGrsVlPTi/qT36whmczOddEm8qX/c1gbw= X-Received: by 2002:a05:6512:3087:: with SMTP id z7mr1261631lfd.556.1632767713713; Mon, 27 Sep 2021 11:35:13 -0700 (PDT) Received: from mail-lf1-f47.google.com (mail-lf1-f47.google.com. [209.85.167.47]) by smtp.gmail.com with ESMTPSA id m10sm1675252lfc.83.2021.09.27.11.35.11 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Sep 2021 11:35:12 -0700 (PDT) Received: by mail-lf1-f47.google.com with SMTP id i4so81250604lfv.4 for ; Mon, 27 Sep 2021 11:35:11 -0700 (PDT) X-Received: by 2002:a2e:bc1e:: with SMTP id b30mr1347010ljf.191.1632767710543; Mon, 27 Sep 2021 11:35:10 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Linus Torvalds Date: Mon, 27 Sep 2021 11:34:54 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: Struct page proposal To: Kent Overstreet Cc: Vlastimil Babka , linux-fsdevel , Linux Kernel Mailing List , Linux-MM , Johannes Weiner , Matthew Wilcox , Andrew Morton , "Darrick J. Wong" , Christoph Hellwig , David Howells Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Sep 27, 2021 at 10:54 AM Kent Overstreet wrote: > > That list_head is the problematic one. Why do we need to be able to take a page > from the middle of a freelist? At least for the merging with the buddy page case. Linus