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=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 069CFC83018 for ; Mon, 30 Nov 2020 15:21:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BC93E2074A for ; Mon, 30 Nov 2020 15:21:11 +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="DWAVMYC5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727997AbgK3PVG (ORCPT ); Mon, 30 Nov 2020 10:21:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55330 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725859AbgK3PVF (ORCPT ); Mon, 30 Nov 2020 10:21:05 -0500 Received: from mail-pj1-x1043.google.com (mail-pj1-x1043.google.com [IPv6:2607:f8b0:4864:20::1043]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BDDA2C0617A6 for ; Mon, 30 Nov 2020 07:20:32 -0800 (PST) Received: by mail-pj1-x1043.google.com with SMTP id b12so1565609pjl.0 for ; Mon, 30 Nov 2020 07:20:32 -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=oSUrQajIlhHrZQJhWJQy1InopKyNlwdkkxQ0BvZwQN0=; b=DWAVMYC5XDS1bTlCs9TeZeHZIApj1emnmPoEgk8/IZ7ZYz+xHQd+CHQzN0jTMjHt6A 6EurUOICoj8KbBR9td5kpGwKGoA+dztk5n9dyU8AA5xAeQE6xE9kgK3url+BCRIy6FCZ gPQiV+HawebRTWfWxeQReGSAtvnV9yX8qsB5PbrgDT+UGA+zxMyufbgmqRQ6IWVweNa1 VLDKbavJwhlBbgHpEGU/kv17lR74Bs2BA+Pr8BIlPtOrhIlnlSZrBqka8633pluwaWlO 7H821KvG/EESks3WYCqjMfZHt6YuOpCIVvFeEMsE+PCAMyC8COjHMGSEfB/Ng3ngDHJE W30g== 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=oSUrQajIlhHrZQJhWJQy1InopKyNlwdkkxQ0BvZwQN0=; b=GZjV2/g6Nqx0XFk7hVTJQTo7UXmgPCTQtZv5ms1tE1/5/OwUlrmiVYBEkDQdSabqAi MS/2i0aLTdUBuL5sa+/fQG8DMHyGFyrYI2bObRTVlIrHC0cyB6S4UYbyG6KXYn+CSk0g 84egxF9y3Lksa0WGd8M/CWHK0zHwCOgT+muAFw8d8oKfCGY9JOm3LDLo/w9tKB36MTXI J3mwNOKYeAblRAfOY0QqkidM+4kkkEydm94+36H99YBNmUomV5SRDvGFh2hVpxRGlBmG 8h+sAhuqMqfXT0/OHxY0mBTYqvurP07BKlBJlNRRf9h8i3Bk4q5YO3v8Vkvk2BsBiHF4 oL7g== X-Gm-Message-State: AOAM531iajGAoHBf/r21+oI4boxWhl5xFTyPJPjUI7jymZBfqDa7yiar Y4Ag8k61J/8attmqZAUkfzaUiw== X-Google-Smtp-Source: ABdhPJzON+jkDByhCM5smb03d/1jVZTcqTeDK4J9d+BOESP/nye9u8yro9JQGq1BxF7HgN3KbYT6Dg== X-Received: by 2002:a17:902:b58a:b029:d7:d45c:481c with SMTP id a10-20020a170902b58ab02900d7d45c481cmr19421067pls.55.1606749632363; Mon, 30 Nov 2020 07:20:32 -0800 (PST) Received: from localhost.bytedance.net ([103.136.221.68]) by smtp.gmail.com with ESMTPSA id q12sm16201660pgv.91.2020.11.30.07.20.22 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Nov 2020 07:20:31 -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 v7 07/15] x86/mm/64: Disable PMD page mapping of vmemmap Date: Mon, 30 Nov 2020 23:18:30 +0800 Message-Id: <20201130151838.11208-8-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20201130151838.11208-1-songmuchun@bytedance.com> References: <20201130151838.11208-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org If we enable the CONFIG_HUGETLB_PAGE_FREE_VMEMMAP, we can just disbale PMD page mapping of vmemmap to simplify the code. In this case, we do not need complex code doing vmemmap page table manipulation. This is a way to simply the first version of this patch series. In the future, we can add some code doing page table manipulation. Signed-off-by: Muchun Song --- arch/x86/mm/init_64.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 0435bee2e172..155cb06a6961 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1557,7 +1557,9 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, { int err; - if (end - start < PAGES_PER_SECTION * sizeof(struct page)) + if (IS_ENABLED(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP)) + err = vmemmap_populate_basepages(start, end, node, NULL); + else if (end - start < PAGES_PER_SECTION * sizeof(struct page)) err = vmemmap_populate_basepages(start, end, node, NULL); else if (boot_cpu_has(X86_FEATURE_PSE)) err = vmemmap_populate_hugepages(start, end, node, altmap); @@ -1610,7 +1612,8 @@ void register_page_bootmem_memmap(unsigned long section_nr, } get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO); - if (!boot_cpu_has(X86_FEATURE_PSE)) { + if (!boot_cpu_has(X86_FEATURE_PSE) || + IS_ENABLED(CONFIG_HUGETLB_PAGE_FREE_VMEMMAP)) { next = (addr + PAGE_SIZE) & PAGE_MASK; pmd = pmd_offset(pud, addr); if (pmd_none(*pmd)) -- 2.11.0