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 A47B5C433E9 for ; Thu, 4 Feb 2021 03:55:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6135D64F3C for ; Thu, 4 Feb 2021 03:55:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231941AbhBDDzW (ORCPT ); Wed, 3 Feb 2021 22:55:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59494 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231743AbhBDDzM (ORCPT ); Wed, 3 Feb 2021 22:55:12 -0500 Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E44DCC06178C for ; Wed, 3 Feb 2021 19:54:17 -0800 (PST) Received: by mail-pj1-x102e.google.com with SMTP id nm1so932342pjb.3 for ; Wed, 03 Feb 2021 19:54:17 -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=rbaYTNYcnNCF5suT1Rnzl4fKBboUgz5smm7iB2s2QLo=; b=BZ9xMp3YtuJbJlv/cWJQps/Tpdxkv3meqtQufoGBj7IPb11hqwXzbvaTSBp0UqKg6T k8PmO7u00wNYkFfNARE+khYCQBrgi9HeU4C40Vbd+k32LaDwwZzikdIIG/JMfQzN62Nr zbCTYPTS8JL3WQZq711tY1VUMY+jriby99Ae6nDbubzItBcSfHUNHogoAY6b+VlW7qBe thr/geWt1x6v7paRRP8bU2CvSpyC4Bg4FrOjTlJ7aGZBZvWv3Tjfbn5BNyHVlW9qCxdI nBKpLmddjx3rW4/khv0BFx8cTDiBZcikuDSB+O64S71OFfgJwCl8ISRrjWStLnYLlM6i tevA== 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=rbaYTNYcnNCF5suT1Rnzl4fKBboUgz5smm7iB2s2QLo=; b=ECLSgMc6NHdsYTMv8vmj0jFvpzas91CV55X64Asz1FFGxMoDQsB4aGvkWwjPI1iVBM TMLXjTYltQydigXM+0ISjmnyteollMTB4ynHXMEROimrR5pDwY0jJ24q/1reOmrzmCHg 1Jxlvl1MQS3rblmgKgfsCAJP0iakpVZJ1q7Gjdp3emVkXPxdzU60ynR4eCWTSkmVx94p 2G2j3pDpPdfowctvkZ+lgQwUoP1dNBhQ63qVT//oBlVT+g/WcA8zGsdgd5M5TrzFytUV demNPOoZHHfTd5xaYgMFt4/ceVHCE815dNeSHa/IX/P+JiGU2axPkUj2sPmwXxguntd5 Tp/Q== X-Gm-Message-State: AOAM533/bySH07EbbKpEUwGkXNqTrZXHC0cA6K3+3BenpoGs8qMgXy1F D61dDRu6MWeAbkWiPp+Upd0LFg== X-Google-Smtp-Source: ABdhPJwYg71Pe1QhU5oYCWBRke57VHrFd8GAEfIocOsjtaS43HRiEMVdR+bZjyHFtv6psvkU3njfNA== X-Received: by 2002:a17:90b:3886:: with SMTP id mu6mr6231566pjb.153.1612410857508; Wed, 03 Feb 2021 19:54:17 -0800 (PST) Received: from localhost.localdomain ([139.177.225.239]) by smtp.gmail.com with ESMTPSA id 9sm3747466pfy.110.2021.02.03.19.54.05 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 03 Feb 2021 19:54:16 -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 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 v14 2/8] mm: hugetlb: introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Thu, 4 Feb 2021 11:50:37 +0800 Message-Id: <20210204035043.36609-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210204035043.36609-1-songmuchun@bytedance.com> References: <20210204035043.36609-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The option HUGETLB_PAGE_FREE_VMEMMAP allows for the freeing of some vmemmap pages associated with pre-allocated HugeTLB pages. For example, on X86_64 6 vmemmap pages of size 4KB each can be saved for each 2MB HugeTLB page. 4094 vmemmap pages of size 4KB each can be saved for each 1GB HugeTLB page. When a HugeTLB page is allocated or freed, the vmemmap array representing the range associated with the page will need to be remapped. When a page is allocated, vmemmap pages are freed after remapping. When a page is freed, previously discarded vmemmap pages must be allocated before remapping. The config option is introduced early so that supporting code can be written to depend on the option. The initial version of the code only provides support for x86-64. Like other code which frees vmemmap, this config option depends on HAVE_BOOTMEM_INFO_NODE. The routine register_page_bootmem_info() is used to register bootmem info. Therefore, make sure register_page_bootmem_info is enabled if HUGETLB_PAGE_FREE_VMEMMAP is defined. Signed-off-by: Muchun Song Reviewed-by: Oscar Salvador Acked-by: Mike Kravetz --- arch/x86/mm/init_64.c | 2 +- fs/Kconfig | 6 ++++++ 2 files changed, 7 insertions(+), 1 deletion(-) 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 97e7b77c9309..de87f234f1e9 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -237,6 +237,12 @@ config HUGETLBFS config HUGETLB_PAGE def_bool HUGETLBFS +config HUGETLB_PAGE_FREE_VMEMMAP + def_bool HUGETLB_PAGE + depends on X86_64 + depends on SPARSEMEM_VMEMMAP + depends on HAVE_BOOTMEM_INFO_NODE + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS -- 2.11.0