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=-11.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 565B6C48BCF for ; Sat, 12 Jun 2021 09:47:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D19926008E for ; Sat, 12 Jun 2021 09:47:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231355AbhFLJtL (ORCPT ); Sat, 12 Jun 2021 05:49:11 -0400 Received: from mail-pg1-f175.google.com ([209.85.215.175]:42765 "EHLO mail-pg1-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231334AbhFLJtG (ORCPT ); Sat, 12 Jun 2021 05:49:06 -0400 Received: by mail-pg1-f175.google.com with SMTP id i34so4487761pgl.9 for ; Sat, 12 Jun 2021 02:47:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=gA36+Qu/57nkq0Sk66RXctcjgNPtwynB7KTlt4954g0=; b=He2HYcJkeO+Y2a0BEPzP7w6zmV4ZaW0+JrvY3JJX2HgWx6kChAzLNMY3dPehnfmXmi wuK9Hs2J7MAu2n4MQEOOi9t4EO00T+l67LHxPjSpkLuvgpvnhB9H0k/ybFYXr2/ZuhJ0 83nIrjv2Unnb920e0w9MkaK+FawhFDCgK8T5mTbfuIB1v6dpatuqaAMH7+dsMq/oomet 8LaeK0tLyBRvM20bDRtg2h+Ks4QdsvpoCrHBG5uWJJxzjdAWf02bTvgXcaJdSTmHHymi OwoIwtAylFcX2ENm/UY07Op+QISCsf/y2k/FvKNQKWuNL7YU5lY/K+5bqIRGx6fxWdJN 89bg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=gA36+Qu/57nkq0Sk66RXctcjgNPtwynB7KTlt4954g0=; b=UgFCPhSA+6Jr8XJ/HQygMda1JkMJE8utHshEU6HiUBwoWXu8a9dDAWf8TuwKMjDXCO U2ITixZlc7w7an3mdAdKK+iEo1mxBGl4VchJ263ZdyzzZAwI5qyxm2+LgZb4GT2SNTqD QoUpKvvfyChDvj6rPxxCqu/xEcZ7ld8oG0hsfkXA+2JJfTxFhgDG/y+P3XXlS4X1WpEU 48SEi3nUKz0dCcUIkmAOwsqKW5ogk9ppiWe3ZGliWhS4wKD9DeHpnndQbHFRgUD7+d/z w+xGcAyFRHbKIf4E2yh5s7DWIzF2MEmqWDC8t5dwWLEtfpM4ruKZeY8LJEtN3lPURKz+ lIiA== X-Gm-Message-State: AOAM533/Etu4j4I8NYOSwThT8K96yVG6y1OsYHrZpD5Jkkegb4Y8xlcM qf33yBtz74rWigPIDrR5R/5Z8Q== X-Google-Smtp-Source: ABdhPJzjvMIBpki2+QrmEYfAaapi7sVu+lRKjPmHd6xRamGe7Rxsj/7f5BJl9/x5reeW6ODPXTSFbQ== X-Received: by 2002:a63:d08:: with SMTP id c8mr7964471pgl.248.1623491167246; Sat, 12 Jun 2021 02:46:07 -0700 (PDT) Received: from localhost.tiktokd.org ([139.177.225.246]) by smtp.gmail.com with ESMTPSA id t39sm6929557pfg.147.2021.06.12.02.46.02 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 12 Jun 2021 02:46:06 -0700 (PDT) From: Muchun Song To: mike.kravetz@oracle.com, akpm@linux-foundation.org, osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com, david@redhat.com, chenhuang5@huawei.com, bodeddub@amazon.com, corbet@lwn.net Cc: duanxiongchun@bytedance.com, fam.zheng@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Muchun Song Subject: [PATCH v2 0/3] Split huge PMD mapping of vmemmap pages Date: Sat, 12 Jun 2021 17:45:52 +0800 Message-Id: <20210612094555.71344-1-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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/ Changelog in v2: 1. Collect Review-by from Mike. 2. Remove helpers used to preallocate/free page tables for HugeTLB pages. Thanks Mike's suggestions. It really eliminate a lot of code. Muchun Song (3): mm: sparsemem: split the huge PMD mapping of vmemmap pages mm: sparsemem: use huge PMD mapping for vmemmap pages mm: hugetlb: introduce CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON Documentation/admin-guide/kernel-parameters.txt | 10 +- arch/x86/mm/init_64.c | 8 +- fs/Kconfig | 10 ++ include/linux/hugetlb.h | 25 +--- include/linux/mm.h | 4 +- mm/hugetlb_vmemmap.c | 11 +- mm/memory_hotplug.c | 2 +- mm/sparse-vmemmap.c | 157 ++++++++++++++++++------ 8 files changed, 149 insertions(+), 78 deletions(-) -- 2.11.0