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=-6.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,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 70ADEC48BE5 for ; Tue, 15 Jun 2021 03:16:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4F93161407 for ; Tue, 15 Jun 2021 03:16:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231225AbhFODSl (ORCPT ); Mon, 14 Jun 2021 23:18:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:58192 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229809AbhFODSg (ORCPT ); Mon, 14 Jun 2021 23:18:36 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C3D4161403; Tue, 15 Jun 2021 01:12:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1623719558; bh=wXpDWAhWzwm6rYJOKAWqIhMA0w55huKKrzBAUYBys2s=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=YMN+ev+O//2iInS48NBgC+9MdSpgmI/zI9YddpMX7rlSorCsZlS8oRLmeGFxkeZRL 7cOaQlBW+AMD5tpW+1mBEiusP6ira2zvKqWb+uvTAfjLgxgHa7b2e2YEcXVO/QQ5Sb HT71Gk5HYyjdjeeUgSFfxa2Vvf743PdsEPgGfN64= Date: Mon, 14 Jun 2021 18:12:37 -0700 From: Andrew Morton To: Muchun Song Cc: mike.kravetz@oracle.com, osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com, david@redhat.com, chenhuang5@huawei.com, bodeddub@amazon.com, corbet@lwn.net, duanxiongchun@bytedance.com, fam.zheng@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 0/3] Split huge PMD mapping of vmemmap pages Message-Id: <20210614181237.5513724624dde3ac930b75d8@linux-foundation.org> In-Reply-To: <20210612094555.71344-1-songmuchun@bytedance.com> References: <20210612094555.71344-1-songmuchun@bytedance.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Sat, 12 Jun 2021 17:45:52 +0800 Muchun Song wrote: > In order to reduce the difficulty of code review in series[1]. We disable > huge PMD mapping of vmemmap pages when that feature is enabled. In this > series, we do not disable huge PMD mapping of vmemmap pages anymore. We > will split huge PMD mapping when needed. When HugeTLB pages are freed from > the pool we do not attempt coalasce and move back to a PMD mapping because > it is much more complex. > > [1] https://lore.kernel.org/linux-doc/20210510030027.56044-1-songmuchun@bytedance.com/ [1] had a nice [0/n] description but the v2 series lost that. I could copy/paste the v1 changelogging but I am unsure that it has been maintained appropriately for the v2 series. I think I'll pass on this v2 pending additional review input. Please reinstate the [0/n] overview if/when resending?