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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 33668C48BE8 for ; Sat, 12 Jun 2021 09:46:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1E87E613AD for ; Sat, 12 Jun 2021 09:46:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231187AbhFLJsT (ORCPT ); Sat, 12 Jun 2021 05:48:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51930 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231179AbhFLJsS (ORCPT ); Sat, 12 Jun 2021 05:48:18 -0400 Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8ABB1C061767 for ; Sat, 12 Jun 2021 02:46:18 -0700 (PDT) Received: by mail-pf1-x435.google.com with SMTP id d16so6453345pfn.12 for ; Sat, 12 Jun 2021 02:46:18 -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:in-reply-to:references :mime-version:content-transfer-encoding; bh=KC0On2yvIRGYR5Tx6Aoa1thZ3mR+Ze9SCIXSxV9QNMo=; b=BWT9fI1X89JDvUQS4XFMLpK1ki292I3lniywkAZFQ387QiFhmPa1rsKIzcyACeeuYn LDCgxz9yhxYBTAg5P+XeDLuJ2xn3Sv17zYC6gcORNRyX0sqGpgcw7tdU33VQqWIcHBJL IWnJLmA9+HiXJd2L6rMQ3QOocJMh2hqMrpcAie+09tUMz9yDxa08HfcBN3jyP3R7OQw2 /g9yIZ+pG2Pdc5vDYqdWQtioRIYGTZ/NHiWjEnJYMGnQeJiARvYB7xBynkuNY7agse0y qmHbGwXgfo7KMImfKVa+7bB2HUF3M4kBxW5W9rl8oevftB/PSX2jKgRpf1fMzy1GxZkk tLhA== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=KC0On2yvIRGYR5Tx6Aoa1thZ3mR+Ze9SCIXSxV9QNMo=; b=ezXnWipcnRZyiYLgfniq1K22i6GIQ42+Xl8+nw/MsxzzESHikiMF2iioTNNcVUeT/S XRMRiDKSsedo3MdETrYrZDLKAryiNnzh1VYvDbmdeEM7Avmhl6R/7vkVl5sN5Y2BHKa+ enxxL7WqlleDpuoT+mud5JdmDuHtAnsk6h01/wccrbILy3sNJqlV7+iH+vYmNGLUY0+o qJpSA99SJerYus/u5iB6Z4EWgEZE4CYtIqlzmep9X6Yxz7kyD++zOwQJUmF+9t/dwzII nfGd92hYNTRGn8X3+4T61Hndl8Tgd9mdd4Q12Lrussn5f+w7vObs5FA1irEjOXVwnNYe 2VCw== X-Gm-Message-State: AOAM530LDrHikROHD9waXlX836iFBnRUbic8zAjidOatNFpdd6k0Xt8v +ofZRPYQM00/Wkz2me0HjVIoGQ== X-Google-Smtp-Source: ABdhPJzlV+X34s+XadDAq8IRfThE+1QP5f7WXqSFWivVZkY7TsjDfOf4yVK+yTR8eXMcg7x/42wckA== X-Received: by 2002:a62:7d4e:0:b029:2e9:ac1c:2769 with SMTP id y75-20020a627d4e0000b02902e9ac1c2769mr12173274pfc.57.1623491178468; Sat, 12 Jun 2021 02:46:18 -0700 (PDT) Received: from localhost.tiktokd.org ([139.177.225.246]) by smtp.gmail.com with ESMTPSA id t39sm6929557pfg.147.2021.06.12.02.46.13 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 12 Jun 2021 02:46:18 -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 2/3] mm: sparsemem: use huge PMD mapping for vmemmap pages Date: Sat, 12 Jun 2021 17:45:54 +0800 Message-Id: <20210612094555.71344-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210612094555.71344-1-songmuchun@bytedance.com> References: <20210612094555.71344-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org The preparation of splitting huge PMD mapping of vmemmap pages is ready, so switch the mapping from PTE to PMD. Signed-off-by: Muchun Song Reviewed-by: Mike Kravetz --- Documentation/admin-guide/kernel-parameters.txt | 7 ------- arch/x86/mm/init_64.c | 8 ++------ include/linux/hugetlb.h | 25 ++++++------------------- mm/memory_hotplug.c | 2 +- 4 files changed, 9 insertions(+), 33 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index db1ef6739613..a01aadafee38 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1599,13 +1599,6 @@ enabled. Allows heavy hugetlb users to free up some more memory (6 * PAGE_SIZE for each 2MB hugetlb page). - This feauture is not free though. Large page - tables are not used to back vmemmap pages which - can lead to a performance degradation for some - workloads. Also there will be memory allocation - required when hugetlb pages are freed from the - pool which can lead to corner cases under heavy - memory pressure. Format: { on | off (default) } on: enable the feature diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 9d9d18d0c2a1..65ea58527176 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -34,7 +34,6 @@ #include #include #include -#include #include #include @@ -1610,8 +1609,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, VM_BUG_ON(!IS_ALIGNED(start, PAGE_SIZE)); VM_BUG_ON(!IS_ALIGNED(end, PAGE_SIZE)); - if ((is_hugetlb_free_vmemmap_enabled() && !altmap) || - end - start < PAGES_PER_SECTION * sizeof(struct page)) + if (end - start < PAGES_PER_SECTION * sizeof(struct page)) err = vmemmap_populate_basepages(start, end, node, NULL); else if (boot_cpu_has(X86_FEATURE_PSE)) err = vmemmap_populate_hugepages(start, end, node, altmap); @@ -1639,8 +1637,6 @@ void register_page_bootmem_memmap(unsigned long section_nr, pmd_t *pmd; unsigned int nr_pmd_pages; struct page *page; - bool base_mapping = !boot_cpu_has(X86_FEATURE_PSE) || - is_hugetlb_free_vmemmap_enabled(); for (; addr < end; addr = next) { pte_t *pte = NULL; @@ -1666,7 +1662,7 @@ void register_page_bootmem_memmap(unsigned long section_nr, } get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO); - if (base_mapping) { + if (!boot_cpu_has(X86_FEATURE_PSE)) { next = (addr + PAGE_SIZE) & PAGE_MASK; pmd = pmd_offset(pud, addr); if (pmd_none(*pmd)) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 03ca83db0a3e..d43565dd5fb9 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -904,20 +904,6 @@ static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, } #endif -#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP -extern bool hugetlb_free_vmemmap_enabled; - -static inline bool is_hugetlb_free_vmemmap_enabled(void) -{ - return hugetlb_free_vmemmap_enabled; -} -#else -static inline bool is_hugetlb_free_vmemmap_enabled(void) -{ - return false; -} -#endif - #else /* CONFIG_HUGETLB_PAGE */ struct hstate {}; @@ -1077,13 +1063,14 @@ static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr pte_t *ptep, pte_t pte, unsigned long sz) { } - -static inline bool is_hugetlb_free_vmemmap_enabled(void) -{ - return false; -} #endif /* CONFIG_HUGETLB_PAGE */ +#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP +extern bool hugetlb_free_vmemmap_enabled; +#else +#define hugetlb_free_vmemmap_enabled false +#endif + static inline spinlock_t *huge_pte_lock(struct hstate *h, struct mm_struct *mm, pte_t *pte) { diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index d96a3c7551c8..9d8a551c08d5 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1056,7 +1056,7 @@ bool mhp_supports_memmap_on_memory(unsigned long size) * populate a single PMD. */ return memmap_on_memory && - !is_hugetlb_free_vmemmap_enabled() && + !hugetlb_free_vmemmap_enabled && IS_ENABLED(CONFIG_MHP_MEMMAP_ON_MEMORY) && size == memory_block_size_bytes() && IS_ALIGNED(vmemmap_size, PMD_SIZE) && -- 2.11.0