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 7F8FBEB64DC for ; Tue, 27 Jun 2023 04:46:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231178AbjF0EqY (ORCPT ); Tue, 27 Jun 2023 00:46:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231180AbjF0Eps (ORCPT ); Tue, 27 Jun 2023 00:45:48 -0400 Received: from mail-yw1-x1134.google.com (mail-yw1-x1134.google.com [IPv6:2607:f8b0:4864:20::1134]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1184B1FD7 for ; Mon, 26 Jun 2023 21:44:21 -0700 (PDT) Received: by mail-yw1-x1134.google.com with SMTP id 00721157ae682-5704fce0f23so42572767b3.3 for ; Mon, 26 Jun 2023 21:44:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1687841060; x=1690433060; h=mime-version:references:message-id:in-reply-to:subject:cc:to:from :date:from:to:cc:subject:date:message-id:reply-to; bh=dVtrcXbE5qXWKdJhq2ArhetT4KPRpQBwbjTOuMnTdxE=; b=501HLYHctmk8sIJeTmzxhRx3/mgKpv1jRi1zyxe6IKd5PzvxEUvUlafEKoDqL6yZVr 8LPzltfzYfOsnNGE3T6BklB22lAMitCgdhFuhtcXDNR8cn90bt0hxS6/rFyMCnKABSjm /oRswCkgkHFa78/d8yQxqLAP7w+UcywLgaNVEk0kQUj/E5gzTgG4U1Ib/QTJ68K6B1lq DHiArvPKR0yaKTV4AcdaFGyA0a3QVzlRHTqcAyQmjJhyBDsZIisDj9Axezm4VTj3plhb Dus4mDTAcMi1b8nttzH3dDwb6//iZcVcKmqu+MryYnw/GG09jfr1xcEP4Qfwx6utRJkj zVzA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1687841060; x=1690433060; h=mime-version:references:message-id:in-reply-to:subject:cc:to:from :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=dVtrcXbE5qXWKdJhq2ArhetT4KPRpQBwbjTOuMnTdxE=; b=btp3nEitqle1a1cMjjyr3mAArPyvXN4YCCl8NDkEamBM7uofB4zyirWgLBI7LsqZml f3YucKBujQD4UtxWZTnuqTR8GJvtD4U7tR39BZdt4MyRbZ1ITHUpyxOhMkHP/u6VoQUm etkSajR9VC+myUoRGG23p2nLsMTfAiWTTkzPmeQT0QhHJNZLwwkU8dYK9EtczoEMKXCD JZUtJ3ycv/XXPzHb88n5TEdho5iB9CwZcFe1wmQ1EJPrt3rVbEEzyTOFvseU5nFMuepP CNkNtw8Zkn8Smwvz9jjgU/eh110JKnuDA5gmDZqua+00itIJSb6+ARDpDcPuoMCZv1Rc EXHg== X-Gm-Message-State: AC+VfDwGkJ4jxKVXF1L61T6b73+S2/leQqAPMPVOqgYmR8HViWGS5OXs LOvXvYEj1zDUJTZkISwSc8mSAA== X-Google-Smtp-Source: ACHHUZ4LBcIHJ/ynOcwzWzKYI9Mk2cjEWGfgZGpKdMoBZ7/XKupPMOzNiMbSCmgeKveyN334gs70/g== X-Received: by 2002:a81:7bc2:0:b0:56d:43cb:da98 with SMTP id w185-20020a817bc2000000b0056d43cbda98mr29864359ywc.29.1687841059932; Mon, 26 Jun 2023 21:44:19 -0700 (PDT) Received: from ripple.attlocal.net (172-10-233-147.lightspeed.sntcca.sbcglobal.net. [172.10.233.147]) by smtp.gmail.com with ESMTPSA id j8-20020a252308000000b00bf44703efd3sm1487805ybj.6.2023.06.26.21.44.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 Jun 2023 21:44:19 -0700 (PDT) Date: Mon, 26 Jun 2023 21:44:08 -0700 (PDT) From: Hugh Dickins X-X-Sender: hugh@ripple.attlocal.net To: "Vishal Moola (Oracle)" cc: Andrew Morton , Matthew Wilcox , linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Hugh Dickins , Catalin Marinas , Huacai Chen , Geert Uytterhoeven , Thomas Bogendoerfer , Dinh Nguyen , Jonas Bonn , David Hildenbrand , Claudio Imbrenda , Paul Walmsley , "David S. Miller" , Richard Weinberger , Yoshinori Sato , Dave Hansen , Arnd Bergmann , Christophe Leroy Subject: Re: [PATCH v6 00/33] Split ptdesc from struct page In-Reply-To: <20230627031431.29653-1-vishal.moola@gmail.com> Message-ID: References: <20230627031431.29653-1-vishal.moola@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org On Mon, 26 Jun 2023, Vishal Moola (Oracle) wrote: > The MM subsystem is trying to shrink struct page. This patchset > introduces a memory descriptor for page table tracking - struct ptdesc. ... > 39 files changed, 686 insertions(+), 455 deletions(-) I don't see the point of this patchset: to me it is just obfuscation of the present-day tight relationship between page table and struct page. Matthew already explained: > The intent is to get ptdescs to be dynamically allocated at some point > in the ~2-3 years out future when we have finished the folio project ... So in a kindly mood, I'd say that this patchset is ahead of its time. But I can certainly adapt to it, if everyone else sees some point to it. Hugh