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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 6AF64C4741F for ; Sun, 8 Nov 2020 14:12:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3075820760 for ; Sun, 8 Nov 2020 14:12:15 +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="o0HEIRih" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728611AbgKHOMO (ORCPT ); Sun, 8 Nov 2020 09:12:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35098 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728389AbgKHOMN (ORCPT ); Sun, 8 Nov 2020 09:12:13 -0500 Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DDD20C0613CF for ; Sun, 8 Nov 2020 06:12:11 -0800 (PST) Received: by mail-pj1-x1044.google.com with SMTP id w20so1894969pjh.1 for ; Sun, 08 Nov 2020 06:12:11 -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=7V5l6iVptpyNChOEqgaC9UYBunmQshAPJJMGH6oVOO8=; b=o0HEIRih4qIk8FKiaCrU/8jPPZ5TYT6PQWg9ap++vRxQ08ObrhpaevX4214Ob2VCY2 bHwFHgK7NR9A1or3FsJjDVthim8iB3WkhekAJ3nEByhI9pBN6luYwVbGAUs/2G+uay5s gooJjeKFBKWzlkf2GamyV+vc4R6VeS43+OqoTKNV73tC1vCFejqm9W4GiKyrG5+yHeM3 xd7pwh2QL62pQA13zHEZhVG27MtZ23E0H1cdnwbg4gAxNqun3pYYuoLtce5HF2bN6yCH HE4blj+ArUxxMH33jBUNT0HzpGNcmth0I2XO7RFjfCMZqNitjz16k+F4CXTTflMWN6uF mbGQ== 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=7V5l6iVptpyNChOEqgaC9UYBunmQshAPJJMGH6oVOO8=; b=B1O7Z4zvPEuuS0Bjr/Ro90l9EdBk/x7peDDB0Eg4RNiNm6aOinnAt4pNUfHW7nOo2Z P3RRGgeYX8aObhOxxYezWpvWN7SeVctUVHRRfKE4IbZAe7s0QINC3RUOYD9nNZb9NOO8 WWhEmspITZju5BjN/WKa4dWR0WFHeQVA1m5Y9QnBsaVcLAjb8EEmuUCqfvO+6jMfAxHO EXd3VApv8htKfmgmKCWksChK1nBPOGGMct4D5JoFkOEzXds/kqUxVFgWSIjgEAMNJOAZ Wd9odBg53dp8uj/kBiNZGelJKHvKDUNiZc5DeJ5JYiMgk5+BTgvrP/PaN0pe40X2nadz 9Bzg== X-Gm-Message-State: AOAM533HfaG8tOeMX/u5SomURKaFyghD3nKwafIhTeuIoRynUhZXxp8r MnCXB86xY1Xes9RJXaTLbeE/fw== X-Google-Smtp-Source: ABdhPJwKM/CCRKYOI1UvT8sA6mZlrIw7idUpNoiTVHntW3fTsKokmQ5P/+hpT6dCP1V9Wu+5WLqwkg== X-Received: by 2002:a17:902:7049:b029:d7:e413:8aba with SMTP id h9-20020a1709027049b02900d7e4138abamr284690plt.30.1604844731474; Sun, 08 Nov 2020 06:12:11 -0800 (PST) Received: from localhost.localdomain ([103.136.220.94]) by smtp.gmail.com with ESMTPSA id z11sm8754047pfk.52.2020.11.08.06.12.01 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 08 Nov 2020 06:12:10 -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 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 v3 03/21] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Sun, 8 Nov 2020 22:10:55 +0800 Message-Id: <20201108141113.65450-4-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201108141113.65450-1-songmuchun@bytedance.com> References: <20201108141113.65450-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The purpose of introducing HUGETLB_PAGE_FREE_VMEMMAP is to configure whether to enable the feature of freeing unused vmemmap associated with HugeTLB pages. Now only support x86. Signed-off-by: Muchun Song --- arch/x86/mm/init_64.c | 2 +- fs/Kconfig | 16 ++++++++++++++++ mm/bootmem_info.c | 3 +-- 3 files changed, 18 insertions(+), 3 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 0a45f062826e..0435bee2e172 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1225,7 +1225,7 @@ static struct kcore_list kcore_vsyscall; static void __init register_page_bootmem_info(void) { -#ifdef CONFIG_NUMA +#if defined(CONFIG_NUMA) || defined(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP) int i; for_each_online_node(i) diff --git a/fs/Kconfig b/fs/Kconfig index 976e8b9033c4..21b8d39a9715 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -245,6 +245,22 @@ config HUGETLBFS config HUGETLB_PAGE def_bool HUGETLBFS +config HUGETLB_PAGE_FREE_VMEMMAP + bool "Free unused vmemmap associated with HugeTLB pages" + default y + depends on X86 + depends on HUGETLB_PAGE + depends on SPARSEMEM_VMEMMAP + depends on HAVE_BOOTMEM_INFO_NODE + help + There are many struct page structures associated with each HugeTLB + page. But we only use a few struct page structures. In this case, + it wastes some memory. It is better to free the unused struct page + structures to buddy system which can save some memory. For + architectures that support it, say Y here. + + If unsure, say N. + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS diff --git a/mm/bootmem_info.c b/mm/bootmem_info.c index d276e96e487f..fcab5a3f8cc0 100644 --- a/mm/bootmem_info.c +++ b/mm/bootmem_info.c @@ -10,8 +10,7 @@ #include #include -void get_page_bootmem(unsigned long info, struct page *page, - unsigned long type) +void get_page_bootmem(unsigned long info, struct page *page, unsigned long type) { page->freelist = (void *)type; SetPagePrivate(page); -- 2.11.0