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=-16.7 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 D07C3C0018C for ; Thu, 10 Dec 2020 03:59:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A7B2D23D67 for ; Thu, 10 Dec 2020 03:59:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732115AbgLJD7V (ORCPT ); Wed, 9 Dec 2020 22:59:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731901AbgLJD6q (ORCPT ); Wed, 9 Dec 2020 22:58:46 -0500 Received: from mail-pg1-x544.google.com (mail-pg1-x544.google.com [IPv6:2607:f8b0:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DA138C0617B0 for ; Wed, 9 Dec 2020 19:57:43 -0800 (PST) Received: by mail-pg1-x544.google.com with SMTP id g18so2981033pgk.1 for ; Wed, 09 Dec 2020 19:57:43 -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=0qsAVJu/9vqouKcThrGhG8OM4QgmEtPOs8IzBVJC9Eg=; b=ua/Fz9eUeVlu2LpIMKy0UOp+uHaI0sfBs3FQrHbm0HvPvH4eWkRaeLlEEU92efDxsO 4mxJ6tCq22SubFJ7d1ufXsth5IMIAV+SCBJ8kcRaqL2SzFr+x5xOSXJZr6rRr3OzelgG wQ3c+xQn9VbbdkGGnBdcQU/ookizH62Nbm4/R2dawbEcdGmcCleAvVfzjUzt5wQPUqDY BPQxFRo+2I4EikkbTZxG0BHAnR2NCyE6Uea97IloorcM08f35h5e4w1q9mTbjYxpCZka w5sHfFoCWXM6oDqWxA0R6XT7LZekiJs/l1rOEnnALJzemecI9TY0ifD7nQ1cUPCbOJA4 43XQ== 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=0qsAVJu/9vqouKcThrGhG8OM4QgmEtPOs8IzBVJC9Eg=; b=OHMam+6Eg2kO4/WoGC5BNrC/8ZswVIZBv+jicjOcH6Qy9hJYhQSoLPmN0P6seEOZ7V aVU1ms0uXxC0DOhLndWoADb/HhSKle9dM+Sip4u9HNFm6jCMNJb/JHTY9kM8iFl7zZJ4 qD542ON5gJOAAJhMpHak29TqTCGqyc4EDIOsvepQ8IUp3NmMRNENJDGY3dMpxlkMHoiu wNhswcKQu0uk/8Z1vIUZhejEa49n6H+d7JdVIkFoqip0iI/BVmCvik+dJDd8KQr92Ymb x1yX1f0clYV9b6EyveRsdSK0dRvIVkNR+mRQv1xhc4FZ/FKOLUKHrFAje8i0GPsPAu7r hSRA== X-Gm-Message-State: AOAM532Xr8q4ztTVEbFVnGGahlfO4kv4OapFMiZmcNJuSAjF05/+yHW9 jRfv3DBKjaUs2l7NBtBnMOwusA== X-Google-Smtp-Source: ABdhPJx/Ck6c2ehZvQUGVZALGx1Bsbfx7bY1n+3IGy+I8VAHFhkKSZcDPMjin5LESQmUuueirc4iAg== X-Received: by 2002:a62:27c1:0:b029:196:59dc:8e6 with SMTP id n184-20020a6227c10000b029019659dc08e6mr4932935pfn.72.1607572663461; Wed, 09 Dec 2020 19:57:43 -0800 (PST) Received: from localhost.localdomain ([103.136.220.85]) by smtp.gmail.com with ESMTPSA id f33sm4266535pgl.83.2020.12.09.19.57.33 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 09 Dec 2020 19:57:42 -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 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 v8 02/12] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Date: Thu, 10 Dec 2020 11:55:16 +0800 Message-Id: <20201210035526.38938-3-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201210035526.38938-1-songmuchun@bytedance.com> References: <20201210035526.38938-1-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. And this is just for dependency check. Now only support x86-64. Because this config depends on HAVE_BOOTMEM_INFO_NODE. And the function of the register_page_bootmem_info() is aimed to register bootmem info. So we should register bootmem info when this config is enabled. Signed-off-by: Muchun Song --- arch/x86/mm/init_64.c | 2 +- fs/Kconfig | 15 +++++++++++++++ 2 files changed, 16 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 976e8b9033c4..4c3a9c614983 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -245,6 +245,21 @@ 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 + help + When using HUGETLB_PAGE_FREE_VMEMMAP, the system can save up some + memory from pre-allocated HugeTLB pages when they are not used. + 6 pages per HugeTLB page of the pmd level mapping and (PAGE_SIZE - 2) + pages per HugeTLB page of the pud level mapping. + + When the pages are going to be used or freed up, the vmemmap array + representing that range needs to be remapped again and the pages + we discarded earlier need to be rellocated again. + config MEMFD_CREATE def_bool TMPFS || HUGETLBFS -- 2.11.0