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=unavailable 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 38063C64E7B for ; Fri, 20 Nov 2020 06:49:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DD78F206B6 for ; Fri, 20 Nov 2020 06:49:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bytedance-com.20150623.gappssmtp.com header.i=@bytedance-com.20150623.gappssmtp.com header.b="ilarJVpi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727145AbgKTGtS (ORCPT ); Fri, 20 Nov 2020 01:49:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727133AbgKTGtR (ORCPT ); Fri, 20 Nov 2020 01:49:17 -0500 Received: from mail-pg1-x542.google.com (mail-pg1-x542.google.com [IPv6:2607:f8b0:4864:20::542]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 024B6C061A04 for ; Thu, 19 Nov 2020 22:49:16 -0800 (PST) Received: by mail-pg1-x542.google.com with SMTP id t37so6411741pga.7 for ; Thu, 19 Nov 2020 22:49:15 -0800 (PST) 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=RKbgeHukBWWau0oXAXahnUGuDDx8LJgRTsdrkFi6LMQ=; b=ilarJVpiysC2TwGERjYBOQId0CfOFqTeTxO7s8DGA84pEF0YJlXiJnIUO2LxN4OTMZ IIPz9cMkunEhpWSzBqOy/UFDV64Jxgz2bdA8RXKQMQi2tjD/5SUXakR4JCnKB1UWL9f3 9ycO2r3mHuVQ0oUiI/Nq19yr2Pwn5Zd1BTHlkA4J2zhUNADCS9oHgyOomHo2P0tmiEY/ bLMkbOQyMv5iDmEYIe7+S4TLTsxaJ7W9z1po4juPLslOYOgzXl4F4k3ufV8TUzLPcA9o 5L6RFeE/bN6W49M9knzp2Ne9Pn0QduTQxtRvzv6EmRZMEHdIkOFE7ttB6xfTg/sKq7Ru X2UA== 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=RKbgeHukBWWau0oXAXahnUGuDDx8LJgRTsdrkFi6LMQ=; b=HYEP5JaJjeJISkTZyuMOpHKtwKN1yex9uP470XmlDnt4VYrh6OYzidEPijwuqu1GBJ 31xpuwkJIy9XrY//4FHlALiqgkP2zQTSNd25BBDOjI341PmTHv8bifst0f9wkr+1CFQ1 vzbt/JBMWiZoJcz4sagrhBEEugZNwxBWb6i5oOehzGFRhOa72lwSrP/EpHGUrav4d3Cb rvtv/ZBek0bXeuaj0Mr61ujA5Wipjhf0o7/7YoSzXMeGLROFeuXC0vFy7rpa3J9Ipay2 lVtUXwinbp5NDRp9MYlepGj+hIxumBAOX1OGXx6B/3uSKV7PjjzDUMbe50Z00dHwnQjK kn4g== X-Gm-Message-State: AOAM5311npQqWIFxCCEAsvOocYzo1QSHFkAk+GtHiWLj/UYkAS84I7lw V8O3DQj2jxNQIegDiEaWVzixXQ== X-Google-Smtp-Source: ABdhPJw3lX9EfMCu83bPE2RgBSOWlgHv04Op3EI6DAr4jn8pAlfR7gcrTul/y/lkJ3qjOK3OjW4pPw== X-Received: by 2002:aa7:9699:0:b029:18a:e057:c44 with SMTP id f25-20020aa796990000b029018ae0570c44mr13140619pfk.34.1605854955543; Thu, 19 Nov 2020 22:49:15 -0800 (PST) Received: from localhost.localdomain ([103.136.221.72]) by smtp.gmail.com with ESMTPSA id 23sm2220278pfx.210.2020.11.19.22.49.04 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 19 Nov 2020 22:49:14 -0800 (PST) From: Muchun Song To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com, willy@infradead.org, osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com Cc: duanxiongchun@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Muchun Song Subject: [PATCH v5 19/21] mm/hugetlb: Gather discrete indexes of tail page Date: Fri, 20 Nov 2020 14:43:23 +0800 Message-Id: <20201120064325.34492-20-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201120064325.34492-1-songmuchun@bytedance.com> References: <20201120064325.34492-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For hugetlb page, there are more metadata to save in the struct page. But the head struct page cannot meet our needs, so we have to abuse other tail struct page to store the metadata. In order to avoid conflicts caused by subsequent use of more tail struct pages, we can gather these discrete indexes of tail struct page In this case, it will be easier to add a new tail page index later. Signed-off-by: Muchun Song --- include/linux/hugetlb.h | 13 +++++++++++++ include/linux/hugetlb_cgroup.h | 15 +++++++++------ mm/hugetlb.c | 12 ++++++------ mm/hugetlb_vmemmap.h | 4 ++-- 4 files changed, 30 insertions(+), 14 deletions(-) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index da18fc9ed152..fa9d38a3ac6f 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -28,6 +28,19 @@ typedef struct { unsigned long pd; } hugepd_t; #include #include +enum { + SUBPAGE_INDEX_ACTIVE = 1, /* reuse page flags of PG_private */ + SUBPAGE_INDEX_TEMPORARY, /* reuse page->mapping */ +#ifdef CONFIG_CGROUP_HUGETLB + SUBPAGE_INDEX_CGROUP = SUBPAGE_INDEX_TEMPORARY,/* reuse page->private */ + SUBPAGE_INDEX_CGROUP_RSVD, /* reuse page->private */ +#endif +#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP + SUBPAGE_INDEX_HWPOISON, /* reuse page->private */ +#endif + NR_USED_SUBPAGE, +}; + struct hugepage_subpool { spinlock_t lock; long count; diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h index 2ad6e92f124a..3d3c1c49efe4 100644 --- a/include/linux/hugetlb_cgroup.h +++ b/include/linux/hugetlb_cgroup.h @@ -24,8 +24,9 @@ struct file_region; /* * Minimum page order trackable by hugetlb cgroup. * At least 4 pages are necessary for all the tracking information. - * The second tail page (hpage[2]) is the fault usage cgroup. - * The third tail page (hpage[3]) is the reservation usage cgroup. + * The second tail page (hpage[SUBPAGE_INDEX_CGROUP]) is the fault + * usage cgroup. The third tail page (hpage[SUBPAGE_INDEX_CGROUP_RSVD]) + * is the reservation usage cgroup. */ #define HUGETLB_CGROUP_MIN_ORDER 2 @@ -66,9 +67,9 @@ __hugetlb_cgroup_from_page(struct page *page, bool rsvd) if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER) return NULL; if (rsvd) - return (struct hugetlb_cgroup *)page[3].private; + return (void *)page_private(page + SUBPAGE_INDEX_CGROUP_RSVD); else - return (struct hugetlb_cgroup *)page[2].private; + return (void *)page_private(page + SUBPAGE_INDEX_CGROUP); } static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page) @@ -90,9 +91,11 @@ static inline int __set_hugetlb_cgroup(struct page *page, if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER) return -1; if (rsvd) - page[3].private = (unsigned long)h_cg; + set_page_private(page + SUBPAGE_INDEX_CGROUP_RSVD, + (unsigned long)h_cg); else - page[2].private = (unsigned long)h_cg; + set_page_private(page + SUBPAGE_INDEX_CGROUP, + (unsigned long)h_cg); return 0; } diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 9aad0b63d369..dfa982f4b525 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1429,20 +1429,20 @@ struct hstate *size_to_hstate(unsigned long size) bool page_huge_active(struct page *page) { VM_BUG_ON_PAGE(!PageHuge(page), page); - return PageHead(page) && PagePrivate(&page[1]); + return PageHead(page) && PagePrivate(&page[SUBPAGE_INDEX_ACTIVE]); } /* never called for tail page */ static void set_page_huge_active(struct page *page) { VM_BUG_ON_PAGE(!PageHeadHuge(page), page); - SetPagePrivate(&page[1]); + SetPagePrivate(&page[SUBPAGE_INDEX_ACTIVE]); } static void clear_page_huge_active(struct page *page) { VM_BUG_ON_PAGE(!PageHeadHuge(page), page); - ClearPagePrivate(&page[1]); + ClearPagePrivate(&page[SUBPAGE_INDEX_ACTIVE]); } /* @@ -1454,17 +1454,17 @@ static inline bool PageHugeTemporary(struct page *page) if (!PageHuge(page)) return false; - return (unsigned long)page[2].mapping == -1U; + return (unsigned long)page[SUBPAGE_INDEX_TEMPORARY].mapping == -1U; } static inline void SetPageHugeTemporary(struct page *page) { - page[2].mapping = (void *)-1U; + page[SUBPAGE_INDEX_TEMPORARY].mapping = (void *)-1U; } static inline void ClearPageHugeTemporary(struct page *page) { - page[2].mapping = NULL; + page[SUBPAGE_INDEX_TEMPORARY].mapping = NULL; } static void __free_huge_page(struct page *page) diff --git a/mm/hugetlb_vmemmap.h b/mm/hugetlb_vmemmap.h index 65e94436ffff..d9c1f45e93ae 100644 --- a/mm/hugetlb_vmemmap.h +++ b/mm/hugetlb_vmemmap.h @@ -25,7 +25,7 @@ static inline void subpage_hwpoison_deliver(struct page *head) struct page *page = head; if (PageHWPoison(head)) - page = head + page_private(head + 4); + page = head + page_private(head + SUBPAGE_INDEX_HWPOISON); /* * Move PageHWPoison flag from head page to the raw error page, @@ -40,7 +40,7 @@ static inline void subpage_hwpoison_deliver(struct page *head) static inline void set_subpage_hwpoison(struct page *head, struct page *page) { if (PageHWPoison(head)) - set_page_private(head + 4, page - head); + set_page_private(head + SUBPAGE_INDEX_HWPOISON, page - head); } static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h) -- 2.11.0