From nobody Fri Sep 12 09:43:21 2025 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 7A9DBE810D5 for ; Fri, 29 Sep 2023 11:45:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233222AbjI2LpZ (ORCPT ); Fri, 29 Sep 2023 07:45:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52462 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233105AbjI2Lo7 (ORCPT ); Fri, 29 Sep 2023 07:44:59 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 0C335CE8 for ; Fri, 29 Sep 2023 04:44:53 -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 0EAF31FB; Fri, 29 Sep 2023 04:45:31 -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 2C6323F59C; Fri, 29 Sep 2023 04:44:50 -0700 (PDT) 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 Cc: Ryan Roberts , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v6 7/9] arm64/mm: Override arch_wants_pte_order() Date: Fri, 29 Sep 2023 12:44:18 +0100 Message-Id: <20230929114421.3761121-8-ryan.roberts@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230929114421.3761121-1-ryan.roberts@arm.com> References: <20230929114421.3761121-1-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" Define an arch-specific override of arch_wants_pte_order() so that when anon_orders=3Drecommend is set, large folios will be allocated for anonymous memory with an order that is compatible with arm64's HPA uarch feature. Reviewed-by: Yu Zhao Signed-off-by: Ryan Roberts Acked-by: Catalin Marinas --- arch/arm64/include/asm/pgtable.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgta= ble.h index 7f7d9b1df4e5..e3d2449dec5c 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1110,6 +1110,16 @@ extern pte_t ptep_modify_prot_start(struct vm_area_s= truct *vma, extern void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep, pte_t old_pte, pte_t new_pte); + +#define arch_wants_pte_order arch_wants_pte_order +static inline int arch_wants_pte_order(void) +{ + /* + * Many arm64 CPUs support hardware page aggregation (HPA), which can + * coalesce 4 contiguous pages into a single TLB entry. + */ + return 2; +} #endif /* !__ASSEMBLY__ */ =20 #endif /* __ASM_PGTABLE_H */ --=20 2.25.1