From nobody Sun Feb 8 21:46:40 2026 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 36CDDEB64DC for ; Mon, 3 Jul 2023 13:54:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231509AbjGCNyA (ORCPT ); Mon, 3 Jul 2023 09:54:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229849AbjGCNx4 (ORCPT ); Mon, 3 Jul 2023 09:53:56 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id EEBF310D9 for ; Mon, 3 Jul 2023 06:53:46 -0700 (PDT) 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 6A42A1424; Mon, 3 Jul 2023 06:54:29 -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 E6A393F73F; Mon, 3 Jul 2023 06:53:44 -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 Cc: Ryan Roberts , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v2 2/5] mm: Allow deferred splitting of arbitrary large anon folios Date: Mon, 3 Jul 2023 14:53:27 +0100 Message-Id: <20230703135330.1865927-3-ryan.roberts@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230703135330.1865927-1-ryan.roberts@arm.com> References: <20230703135330.1865927-1-ryan.roberts@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" With the introduction of large folios for anonymous memory, 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. Signed-off-by: Ryan Roberts Reviewed-by: Yu Zhao Reviewed-by: Yin Fengwei --- mm/rmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/rmap.c b/mm/rmap.c index 82ef5ba363d1..bbcb2308a1c5 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1474,7 +1474,7 @@ void page_remove_rmap(struct page *page, struct vm_ar= ea_struct *vma, * 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); } --=20 2.25.1