From patchwork Fri Jul 14 16:17:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Roberts X-Patchwork-Id: 13313841 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 81A93C001DC for ; Fri, 14 Jul 2023 16:18:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=NNWWaejUuCRn54Ho38x6cpQMEG8+nEPw61+t/xaQ9ik=; b=tjqvvgtqHxEscA U+6nSl7NajzYeKWUcYpZO/Y0/ffi800u42QvQS9WrSZzKn4lURwUPqXZ2ItLZ7Rp5d1lZgEPzBGi9 +c7tCHGTIBefSuHEdr7Xh+OFOS4VLA5QOBIr149yiZMeybBgI/B6bVHWMpXX+q8Mmbo/DpKydWopc YzQUEQT5pZbdycyjXyNaA5qhrKrR9AOoirBP5C5HHiJdFj+3S+HA/iOq/CgIJH0pH7d/5Tmbt3P9D ja7lpMWOjiHgEev0mO0xmLBgkS4f9majRXG170v2tc++3NXckE6hwYcJn0WfO6SMOTeSpMQcJV2wl sbzoUVVq/yNDUhUcME5g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qKLUO-006cqi-0n; Fri, 14 Jul 2023 16:17:52 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qKLUL-006cn0-0T for linux-arm-kernel@lists.infradead.org; Fri, 14 Jul 2023 16:17:50 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 56B861570; Fri, 14 Jul 2023 09:18:26 -0700 (PDT) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.26]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 089E33F740; Fri, 14 Jul 2023 09:17:41 -0700 (PDT) From: Ryan Roberts To: Andrew Morton , Matthew Wilcox , "Kirill A. Shutemov" , Yin Fengwei , David Hildenbrand , Yu Zhao , Catalin Marinas , Will Deacon , Anshuman Khandual , Yang Shi , "Huang, Ying" , Zi Yan , Luis Chamberlain Cc: Ryan Roberts , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v3 1/4] mm: Non-pmd-mappable, large folios for folio_add_new_anon_rmap() Date: Fri, 14 Jul 2023 17:17:30 +0100 Message-Id: <20230714161733.4144503-1-ryan.roberts@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230714160407.4142030-1-ryan.roberts@arm.com> References: <20230714160407.4142030-1-ryan.roberts@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230714_091749_228195_928BB04C X-CRM114-Status: GOOD ( 15.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org In preparation for FLEXIBLE_THP support, improve folio_add_new_anon_rmap() to allow a non-pmd-mappable, large folio to be passed to it. In this case, all contained pages are accounted using the order-0 folio (or base page) scheme. Signed-off-by: Ryan Roberts Reviewed-by: Yu Zhao Reviewed-by: Yin Fengwei --- mm/rmap.c | 28 +++++++++++++++++++++------- 1 file changed, 21 insertions(+), 7 deletions(-) -- 2.25.1 diff --git a/mm/rmap.c b/mm/rmap.c index 0c0d8857dfce..f293d072368a 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1278,31 +1278,45 @@ void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma, * This means the inc-and-test can be bypassed. * The folio does not have to be locked. * - * If the folio is large, it is accounted as a THP. As the folio + * If the folio is pmd-mappable, it is accounted as a THP. As the folio * is new, it's assumed to be mapped exclusively by a single process. */ void folio_add_new_anon_rmap(struct folio *folio, struct vm_area_struct *vma, unsigned long address) { - int nr; + int nr = folio_nr_pages(folio); - VM_BUG_ON_VMA(address < vma->vm_start || address >= vma->vm_end, vma); + VM_BUG_ON_VMA(address < vma->vm_start || + address + (nr << PAGE_SHIFT) > vma->vm_end, vma); __folio_set_swapbacked(folio); - if (likely(!folio_test_pmd_mappable(folio))) { + if (!folio_test_large(folio)) { /* increment count (starts at -1) */ atomic_set(&folio->_mapcount, 0); - nr = 1; + __page_set_anon_rmap(folio, &folio->page, vma, address, 1); + } else if (!folio_test_pmd_mappable(folio)) { + int i; + + for (i = 0; i < nr; i++) { + struct page *page = folio_page(folio, i); + + /* increment count (starts at -1) */ + atomic_set(&page->_mapcount, 0); + __page_set_anon_rmap(folio, page, vma, + address + (i << PAGE_SHIFT), 1); + } + + /* increment count (starts at 0) */ + atomic_set(&folio->_nr_pages_mapped, nr); } else { /* increment count (starts at -1) */ atomic_set(&folio->_entire_mapcount, 0); atomic_set(&folio->_nr_pages_mapped, COMPOUND_MAPPED); - nr = folio_nr_pages(folio); + __page_set_anon_rmap(folio, &folio->page, vma, address, 1); __lruvec_stat_mod_folio(folio, NR_ANON_THPS, nr); } __lruvec_stat_mod_folio(folio, NR_ANON_MAPPED, nr); - __page_set_anon_rmap(folio, &folio->page, vma, address, 1); } /**