From patchwork Thu Dec 7 16:12:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Roberts X-Patchwork-Id: 13483629 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 92D94C10F07 for ; Thu, 7 Dec 2023 16:13:16 +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=j7mMgPx/HHWLij3/ULMa1QxRMkPkg/g0NJ0kRJQldZc=; b=lC03++s15VNIM/ TlR2wi3d/YncmAxBNWqMyRGoaXgthGFV8psDjQJAlWSq4FwWkLOLqchAX2NsSvO2Gwkmv5KZ1wmFT dio1IjGuKiRwn3BcyX9KlUYHfNISVM9ueBj6MUnqE2UtkeP5S2X7VTZf0PgpRNdpEaQH3DcbG5mqm Ksz1Q+SFY0HbbbX4ta5iV4lWXtxXD/BGifB6IssyQjs39RKjb4nbN4HcyCrBtcFYcBfcbiDajIJnV kSg7NaMSP2VmYOQO9UCAcu2e3cuIz64ZA4cMvlPKXzSsWdNk5HXxii4AWsslP8sC01aDzrkCaLp5H qPN5n026hhIiS3hF7pog==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rBGzO-00DMj7-2K; Thu, 07 Dec 2023 16:12:38 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rBGzH-00DMeZ-1a for linux-arm-kernel@lists.infradead.org; Thu, 07 Dec 2023 16:12:34 +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 A214A1570; Thu, 7 Dec 2023 08:13:16 -0800 (PST) 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 C03523F762; Thu, 7 Dec 2023 08:12:27 -0800 (PST) From: Ryan Roberts To: Andrew Morton , Matthew Wilcox , Yin Fengwei , David Hildenbrand , Yu Zhao , Catalin Marinas , Anshuman Khandual , Yang Shi , "Huang, Ying" , Zi Yan , Luis Chamberlain , Itaru Kitayama , "Kirill A. Shutemov" , John Hubbard , David Rientjes , Vlastimil Babka , Hugh Dickins , Kefeng Wang , Barry Song <21cnbao@gmail.com>, Alistair Popple Cc: Ryan Roberts , linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Barry Song Subject: [PATCH v9 01/10] mm: Allow deferred splitting of arbitrary anon large folios Date: Thu, 7 Dec 2023 16:12:02 +0000 Message-Id: <20231207161211.2374093-2-ryan.roberts@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231207161211.2374093-1-ryan.roberts@arm.com> References: <20231207161211.2374093-1-ryan.roberts@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231207_081231_577341_56682563 X-CRM114-Status: GOOD ( 12.23 ) 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 the introduction of anonymous multi-size THP, we would like to be able to split them when they have unmapped subpages, in order to free those unused pages under memory pressure. So remove the artificial requirement that the large folio needed to be at least PMD-sized. Reviewed-by: Yu Zhao Reviewed-by: Yin Fengwei Reviewed-by: Matthew Wilcox (Oracle) Reviewed-by: David Hildenbrand Reviewed-by: Barry Song Tested-by: Kefeng Wang Tested-by: John Hubbard Signed-off-by: Ryan Roberts --- mm/rmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/rmap.c b/mm/rmap.c index de9426ad0f1b..2a1e45e6419f 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1518,11 +1518,11 @@ void page_remove_rmap(struct page *page, struct vm_area_struct *vma, __lruvec_stat_mod_folio(folio, idx, -nr); /* - * Queue anon THP for deferred split if at least one + * Queue anon large folio for deferred split if at least one * page of the folio is unmapped and at least one page * is still mapped. */ - if (folio_test_pmd_mappable(folio) && folio_test_anon(folio)) + if (folio_test_large(folio) && folio_test_anon(folio)) if (!compound || nr < nr_pmdmapped) deferred_split_folio(folio); }