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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 0356CC433DB for ; Mon, 8 Mar 2021 10:31:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 910A0651FD for ; Mon, 8 Mar 2021 10:31:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 910A0651FD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=bytedance.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1A1028D0017; Mon, 8 Mar 2021 05:31:49 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 178378D000F; Mon, 8 Mar 2021 05:31:49 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F0D898D0017; Mon, 8 Mar 2021 05:31:48 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0037.hostedemail.com [216.40.44.37]) by kanga.kvack.org (Postfix) with ESMTP id D51678D000F for ; Mon, 8 Mar 2021 05:31:48 -0500 (EST) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 97F9D4DDF for ; Mon, 8 Mar 2021 10:31:48 +0000 (UTC) X-FDA: 77896341096.04.2D225CF Received: from mail-pg1-f170.google.com (mail-pg1-f170.google.com [209.85.215.170]) by imf13.hostedemail.com (Postfix) with ESMTP id 5C570E0011ED for ; Mon, 8 Mar 2021 10:31:46 +0000 (UTC) Received: by mail-pg1-f170.google.com with SMTP id n9so5178963pgi.7 for ; Mon, 08 Mar 2021 02:31:47 -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=Gw7If/C0Ne/OYQ2y0VpGAH3dv4XdNgIwNckS1MywxXA=; b=toEEpPxF02Kt6aVribByeJkYVqNhu26gr1srHf6CK/vm1Z0/ZEYsSZiMvVSb5AMJkP OXhSYI31jpE+0bqaJhgdCM/RZ0zpQOMjHVJ+7VTwIo3iCmPogoNo2Z8J89MSMLWEBKYQ JNtPQs0silxX8NB2Ijbdbd5JsQ/bVHMOy/+UvgYLlVq4rifLdA+EP6SEx3KJleBz+leg G5A57aos63rgx7oW1ppRB6bRCHMS6EP/BPBgW0WuP6C/p5/pg7RatCn9/lRLO5dfTPF2 6Ag8NKprulSTjkWbGhvFP1/BCm5av1WQ9aRafQTcgYnO/IGZyNC/E0+nI8sItW6YYkPm f8Gw== 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=Gw7If/C0Ne/OYQ2y0VpGAH3dv4XdNgIwNckS1MywxXA=; b=SdQ+4mCGW3GNxB41YZQjwQvSgwHrzrTYVti4AyLRFkBNkEhJo2Zv+8BYZaARBf/Ulx ErZOJvFbOdwXy0byUVSlgA8hPv4VOiig+yKf0l/ZVGy2lCGc1xTjZkDPpJtRcfwotvpX JsWqHe7c2I+amugEhjYA27E55bmF0KdEH+Q0ahRVrB9lsFg/S/pCY/qW+QUKgp6mZTL8 G26E55VNb2IAwhhCdt4FuuutTKdJpBiG54kB02kcjHJv90AIli1j2KsRVTmA8p/8QPF9 LGKvcHb1WtsPTbpdFF6LuLVJkEHK7sxHWPCb5hS5rTN3jHXrVRD4T0NVbY+gM9mmKa7f fQKw== X-Gm-Message-State: AOAM531025jviBowLy2CgLiqzjNe5RbykqQc+RXAoWZiatx0yURc16s2 D+7lG7qHTzsv54Cn2DKuUWYy1w== X-Google-Smtp-Source: ABdhPJwdZ4YcdFW8CHkEwUCOSqhE49zvBYv/iQeoO3Ptr+k9SWCXFNamG02s5HPNee1mkDYrx2JaWg== X-Received: by 2002:aa7:8e8f:0:b029:1f1:5a1a:7f82 with SMTP id a15-20020aa78e8f0000b02901f15a1a7f82mr14180479pfr.52.1615199507074; Mon, 08 Mar 2021 02:31:47 -0800 (PST) Received: from localhost.localdomain ([139.177.225.255]) by smtp.gmail.com with ESMTPSA id ge16sm10744705pjb.43.2021.03.08.02.31.33 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 08 Mar 2021 02:31:46 -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, david@redhat.com, naoya.horiguchi@nec.com, joao.m.martins@oracle.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 , Miaohe Lin , Chen Huang , Bodeddula Balasubramaniam Subject: [PATCH v18 7/9] mm: hugetlb: introduce nr_free_vmemmap_pages in the struct hstate Date: Mon, 8 Mar 2021 18:28:05 +0800 Message-Id: <20210308102807.59745-8-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210308102807.59745-1-songmuchun@bytedance.com> References: <20210308102807.59745-1-songmuchun@bytedance.com> MIME-Version: 1.0 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 5C570E0011ED X-Stat-Signature: tezryx4gjswe7mngyrt6ymgagkmyywbo Received-SPF: none (bytedance.com>: No applicable sender policy available) receiver=imf13; identity=mailfrom; envelope-from=""; helo=mail-pg1-f170.google.com; client-ip=209.85.215.170 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615199506-734150 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: All the infrastructure is ready, so we introduce nr_free_vmemmap_pages field in the hstate to indicate how many vmemmap pages associated with a HugeTLB page that can be freed to buddy allocator. And initialize it in the hugetlb_vmemmap_init(). This patch is actual enablement of the feature. Signed-off-by: Muchun Song Acked-by: Mike Kravetz Reviewed-by: Oscar Salvador Reviewed-by: Miaohe Lin Tested-by: Chen Huang Tested-by: Bodeddula Balasubramaniam --- include/linux/hugetlb.h | 3 +++ mm/hugetlb.c | 1 + mm/hugetlb_vmemmap.c | 25 +++++++++++++++++++++++++ mm/hugetlb_vmemmap.h | 10 ++++++---- 4 files changed, 35 insertions(+), 4 deletions(-) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 78934e9aeab6..a4d80f7263fc 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -560,6 +560,9 @@ struct hstate { unsigned int nr_huge_pages_node[MAX_NUMNODES]; unsigned int free_huge_pages_node[MAX_NUMNODES]; unsigned int surplus_huge_pages_node[MAX_NUMNODES]; +#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP + unsigned int nr_free_vmemmap_pages; +#endif #ifdef CONFIG_CGROUP_HUGETLB /* cgroup control files */ struct cftype cgroup_files_dfl[7]; diff --git a/mm/hugetlb.c b/mm/hugetlb.c index c0c1b7635ca9..c221b937be17 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3312,6 +3312,7 @@ void __init hugetlb_add_hstate(unsigned int order) h->next_nid_to_free =3D first_memory_node; snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB", huge_page_size(h)/1024); + hugetlb_vmemmap_init(h); =20 parsed_hstate =3D h; } diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index 7807ed6678e0..b65f0d5189bd 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -251,3 +251,28 @@ void free_huge_page_vmemmap(struct hstate *h, struct= page *head) */ vmemmap_remap_free(vmemmap_addr, vmemmap_end, vmemmap_reuse); } + +void __init hugetlb_vmemmap_init(struct hstate *h) +{ + unsigned int nr_pages =3D pages_per_huge_page(h); + unsigned int vmemmap_pages; + + if (!hugetlb_free_vmemmap_enabled) + return; + + vmemmap_pages =3D (nr_pages * sizeof(struct page)) >> PAGE_SHIFT; + /* + * The head page and the first tail page are not to be freed to buddy + * allocator, the other pages will map to the first tail page, so they + * can be freed. + * + * Could RESERVE_VMEMMAP_NR be greater than @vmemmap_pages? It is true + * on some architectures (e.g. aarch64). See Documentation/arm64/ + * hugetlbpage.rst for more details. + */ + if (likely(vmemmap_pages > RESERVE_VMEMMAP_NR)) + h->nr_free_vmemmap_pages =3D vmemmap_pages - RESERVE_VMEMMAP_NR; + + pr_info("can free %d vmemmap pages for %s\n", h->nr_free_vmemmap_pages, + h->name); +} diff --git a/mm/hugetlb_vmemmap.h b/mm/hugetlb_vmemmap.h index a37771b0b82a..cb2bef8f9e73 100644 --- a/mm/hugetlb_vmemmap.h +++ b/mm/hugetlb_vmemmap.h @@ -13,17 +13,15 @@ #ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP int alloc_huge_page_vmemmap(struct hstate *h, struct page *head); void free_huge_page_vmemmap(struct hstate *h, struct page *head); +void hugetlb_vmemmap_init(struct hstate *h); =20 /* * How many vmemmap pages associated with a HugeTLB page that can be fre= ed * to the buddy allocator. - * - * Todo: Returns zero for now, which means the feature is disabled. We w= ill - * enable it once all the infrastructure is there. */ static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h= ) { - return 0; + return h->nr_free_vmemmap_pages; } #else static inline int alloc_huge_page_vmemmap(struct hstate *h, struct page = *head) @@ -35,6 +33,10 @@ static inline void free_huge_page_vmemmap(struct hstat= e *h, struct page *head) { } =20 +static inline void hugetlb_vmemmap_init(struct hstate *h) +{ +} + static inline unsigned int free_vmemmap_pages_per_hpage(struct hstate *h= ) { return 0; --=20 2.11.0