From mboxrd@z Thu Jan 1 00:00:00 1970 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6021BEB64DD for ; Mon, 3 Jul 2023 13:53:52 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id DDC0A90000B; Mon, 3 Jul 2023 09:53:51 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D659F280001; Mon, 3 Jul 2023 09:53:51 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C064E90000D; Mon, 3 Jul 2023 09:53:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 995A990000B for ; Mon, 3 Jul 2023 09:53:51 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 68D07120910 for ; Mon, 3 Jul 2023 13:53:51 +0000 (UTC) X-FDA: 80970443862.14.69ADBFA Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf02.hostedemail.com (Postfix) with ESMTP id AC80780013 for ; Mon, 3 Jul 2023 13:53:49 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=none; spf=pass (imf02.hostedemail.com: domain of ryan.roberts@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=ryan.roberts@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1688392429; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=USdbSWQAhhNgz/kbRbFMcj5UNwofuLjMnykBwRvmpy4=; b=CkvvpLWGDwzy3V0C3D4ngVmbdglGrsooTRlb5Mtbold1591QWRaxbGIGGhOrJDzWy49mhq 4C11JqbRF10QGPnk7c8Wxj4v0/hASzChsbIqhMpCKsvt+e4rbZmjCCqyqDhoIHr1glYbf6 u5mZDTG8X5vEDw0RqNnpBGn8ap06Yjo= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=none; spf=pass (imf02.hostedemail.com: domain of ryan.roberts@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=ryan.roberts@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1688392429; a=rsa-sha256; cv=none; b=TWZ7PajOETh5dkBd0UnskFkBoYx/UK30nzpNN9xyybroxx9r6yxEGbS7K07pSa0B8JH9Cu 5J8eRPOijEiFkQxyjTIqFKUeYGnUiQGo6DJAzXdHBP2wTQtlE56Ys5UBBGy3iGCg99MIlS J57tAB3/gLmlwyo+Ow70K0UyfnhpR4A= 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 6399A11FB; Mon, 3 Jul 2023 06:54:31 -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 DF28C3F73F; Mon, 3 Jul 2023 06:53:46 -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 3/5] mm: Default implementation of arch_wants_pte_order() Date: Mon, 3 Jul 2023 14:53:28 +0100 Message-Id: <20230703135330.1865927-4-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: 8bit X-Rspamd-Queue-Id: AC80780013 X-Rspam-User: X-Stat-Signature: zuwhdwyjd9fumrsnkn14epak7zphfauf X-Rspamd-Server: rspam01 X-HE-Tag: 1688392429-296835 X-HE-Meta: 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 KSRFWucJ RBmK4Yf+d5G4vA55lac7PugRrvDjRh79rXCcIbOEcdagT5kWv8jBal8zR7JYs5PCOIpE0fPQ9daKU9z5Z4ji1AJYSL5dn470/s+PwK6/s3eEv5ApuFaSZTs6MqHimL7mS9IiSAGnXTUVqm6xhVWgtoWgy4PV4Q+IqnG1eIPGaNGPkPowrXgxxqfSFCUUg89ae2ToxRXoxVWYfcveGZIqQ00X6cT4Smnrl7jy23zNwEsn0/v0= 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: arch_wants_pte_order() can be overridden by the arch to return the preferred folio order for pte-mapped memory. This is useful as some architectures (e.g. arm64) can coalesce TLB entries when the physical memory is suitably contiguous. The first user for this hint will be FLEXIBLE_THP, which aims to allocate large folios for anonymous memory to reduce page faults and other per-page operation costs. Here we add the default implementation of the function, used when the architecture does not define it, which returns the order corresponding to 64K. Signed-off-by: Ryan Roberts --- include/linux/pgtable.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index a661a17173fa..f7e38598f20b 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -13,6 +13,7 @@ #include #include #include +#include #if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \ defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS @@ -336,6 +337,18 @@ static inline bool arch_has_hw_pte_young(void) } #endif +#ifndef arch_wants_pte_order +/* + * Returns preferred folio order for pte-mapped memory. Must be in range [0, + * PMD_SHIFT-PAGE_SHIFT) and must not be order-1 since THP requires large folios + * to be at least order-2. + */ +static inline int arch_wants_pte_order(struct vm_area_struct *vma) +{ + return ilog2(SZ_64K >> PAGE_SHIFT); +} +#endif + #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long address, -- 2.25.1