From patchwork Wed Jan 27 11:23:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oscar Salvador X-Patchwork-Id: 12049723 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, 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 32A8BC433DB for ; Wed, 27 Jan 2021 11:24:29 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 90B1B20754 for ; Wed, 27 Jan 2021 11:24:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 90B1B20754 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id ECE806B0005; Wed, 27 Jan 2021 06:24:27 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E7EE36B0006; Wed, 27 Jan 2021 06:24:27 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D93E66B0007; Wed, 27 Jan 2021 06:24:27 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0129.hostedemail.com [216.40.44.129]) by kanga.kvack.org (Postfix) with ESMTP id C343F6B0005 for ; Wed, 27 Jan 2021 06:24:27 -0500 (EST) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 8C34C181AEF23 for ; Wed, 27 Jan 2021 11:24:27 +0000 (UTC) X-FDA: 77751321774.04.pipe61_0914b5e27596 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin04.hostedemail.com (Postfix) with ESMTP id 70909800FFCA for ; Wed, 27 Jan 2021 11:24:27 +0000 (UTC) X-HE-Tag: pipe61_0914b5e27596 X-Filterd-Recvd-Size: 5677 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf27.hostedemail.com (Postfix) with ESMTP for ; Wed, 27 Jan 2021 11:24:26 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 86FF2AD2B; Wed, 27 Jan 2021 11:24:25 +0000 (UTC) From: Oscar Salvador To: Andrew Morton Cc: David Hildenbrand , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H . Peter Anvin" , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Oscar Salvador Subject: [PATCH] x86/vmemmap: Handle unpopulated sub-pmd ranges Date: Wed, 27 Jan 2021 12:23:15 +0100 Message-Id: <20210127112315.28297-1-osalvador@suse.de> X-Mailer: git-send-email 2.13.7 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: When the size of a struct page is not multiple of 2MB, sections do not span a PMD anymore and so when populating them some parts of the PMD will remain unused. Because of this, PMDs will be left behind when depopulating sections since remove_pmd_table() thinks that those unused parts are still in use. Fix this by marking the unused parts with PAGE_INUSE, so memchr_inv() will do the right thing and will let us free the PMD when the last user of it is gone. This patch is based on a similar patch by David Hildenbrand: https://lore.kernel.org/linux-mm/20200722094558.9828-9-david@redhat.com/ https://lore.kernel.org/linux-mm/20200722094558.9828-10-david@redhat.com/ Signed-off-by: Oscar Salvador --- arch/x86/mm/init_64.c | 81 +++++++++++++++++++++++++++++++++++++++---- 1 file changed, 74 insertions(+), 7 deletions(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index b5a3fa4033d3..9b6d45ea353b 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -873,6 +873,71 @@ int arch_add_memory(int nid, u64 start, u64 size, #define PAGE_INUSE 0xFD +/* + * The unused vmemmap range, which was not yet memset(PAGE_INUSE) ranges + * from unused_pmd_start to next PMD_SIZE boundary. + */ +static unsigned long unused_pmd_start __meminitdata; + +static void __meminit vmemmap_flush_unused_pmd(void) +{ + if (!unused_pmd_start) + return; + /* + * Clears (unused_pmd_start, PMD_END] + */ + memset((void *)unused_pmd_start, PAGE_INUSE, + ALIGN(unused_pmd_start, PMD_SIZE) - unused_pmd_start); + unused_pmd_start = 0; +} + +/* Returns true if the PMD is completely unused and thus it can be freed */ +static bool __meminit vmemmap_unuse_sub_pmd(unsigned long addr, unsigned long end) +{ + unsigned long start = ALIGN_DOWN(addr, PMD_SIZE); + + vmemmap_flush_unused_pmd(); + memset((void *)addr, PAGE_INUSE, end - addr); + + return !memchr_inv((void *)start, PAGE_INUSE, PMD_SIZE); +} + +static void __meminit vmemmap_use_sub_pmd(unsigned long start, unsigned long end) +{ + /* + * We only optimize if the new used range directly follows the + * previously unused range (esp., when populating consecutive sections). + */ + if (unused_pmd_start == start) { + if (likely(IS_ALIGNED(end, PMD_SIZE))) + unused_pmd_start = 0; + else + unused_pmd_start = end; + return; + } + + vmemmap_flush_unused_pmd(); +} + +static void __meminit vmemmap_use_new_sub_pmd(unsigned long start, unsigned long end) +{ + vmemmap_flush_unused_pmd(); + + /* + * Mark the unused parts of the new memmap range + */ + if (!IS_ALIGNED(start, PMD_SIZE)) + memset((void *)start, PAGE_INUSE, + start - ALIGN_DOWN(start, PMD_SIZE)); + /* + * We want to avoid memset(PAGE_UNUSED) when populating the vmemmap of + * consecutive sections. Remember for the last added PMD the last + * unused range in the populated PMD. + */ + if (!IS_ALIGNED(end, PMD_SIZE)) + unused_pmd_start = end; +} + static void __meminit free_pagetable(struct page *page, int order) { unsigned long magic; @@ -1034,7 +1099,6 @@ remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end, unsigned long next, pages = 0; pte_t *pte_base; pmd_t *pmd; - void *page_addr; pmd = pmd_start + pmd_index(addr); for (; addr < end; addr = next, pmd++) { @@ -1055,12 +1119,10 @@ remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end, spin_unlock(&init_mm.page_table_lock); pages++; } else { - /* If here, we are freeing vmemmap pages. */ - memset((void *)addr, PAGE_INUSE, next - addr); - - page_addr = page_address(pmd_page(*pmd)); - if (!memchr_inv(page_addr, PAGE_INUSE, - PMD_SIZE)) { + /* + * Free the PMD if the whole range is unused. + */ + if (vmemmap_unuse_sub_pmd(addr, next)) { free_hugepage_table(pmd_page(*pmd), altmap); @@ -1538,11 +1600,16 @@ static int __meminit vmemmap_populate_hugepages(unsigned long start, addr_end = addr + PMD_SIZE; p_end = p + PMD_SIZE; + + if (!IS_ALIGNED(addr, PMD_SIZE) || + !IS_ALIGNED(next, PMD_SIZE)) + vmemmap_use_new_sub_pmd(addr, next); continue; } else if (altmap) return -ENOMEM; /* no fallback */ } else if (pmd_large(*pmd)) { vmemmap_verify((pte_t *)pmd, node, addr, next); + vmemmap_use_sub_pmd(addr, next); continue; } if (vmemmap_populate_basepages(addr, next, node, NULL))