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 X-Spam-Level: X-Spam-Status: No, score=-5.6 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26B9BC433DB for ; Fri, 5 Feb 2021 08:29:49 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7472B64DA5 for ; Fri, 5 Feb 2021 08:29:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7472B64DA5 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E17796B0005; Fri, 5 Feb 2021 03:29:47 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id D9F4C6B006C; Fri, 5 Feb 2021 03:29:47 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C8DC36B006E; Fri, 5 Feb 2021 03:29:47 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0190.hostedemail.com [216.40.44.190]) by kanga.kvack.org (Postfix) with ESMTP id AFA776B0005 for ; Fri, 5 Feb 2021 03:29:47 -0500 (EST) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 7062C181AEF15 for ; Fri, 5 Feb 2021 08:29:47 +0000 (UTC) X-FDA: 77783540814.07.crime10_4413afa275e3 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin07.hostedemail.com (Postfix) with ESMTP id 594E61803F9A4 for ; Fri, 5 Feb 2021 08:29:47 +0000 (UTC) X-HE-Tag: crime10_4413afa275e3 X-Filterd-Recvd-Size: 2391 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf09.hostedemail.com (Postfix) with ESMTP for ; Fri, 5 Feb 2021 08:29:46 +0000 (UTC) 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 EB71331B; Fri, 5 Feb 2021 00:29:45 -0800 (PST) Received: from [10.163.93.198] (unknown [10.163.93.198]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9F6733F73B; Fri, 5 Feb 2021 00:29:42 -0800 (PST) Subject: Re: [RFC 2/3] arm64/hugetlb: Enable HUGETLB_PAGE_SIZE_VARIABLE To: David Hildenbrand , linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, akpm@linux-foundation.org Cc: Will Deacon , Robin Murphy , Marek Szyprowski , Christoph Hellwig , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <1612422084-30429-1-git-send-email-anshuman.khandual@arm.com> <1612422084-30429-3-git-send-email-anshuman.khandual@arm.com> <616578ec-8a61-ce0a-a467-50915b3a9967@redhat.com> From: Anshuman Khandual Message-ID: Date: Fri, 5 Feb 2021 14:00:11 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <616578ec-8a61-ce0a-a467-50915b3a9967@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 2/5/21 1:50 PM, David Hildenbrand wrote: > On 04.02.21 08:01, Anshuman Khandual wrote: >> MAX_ORDER which invariably depends on FORCE_MAX_ZONEORDER can be a variable >> for a given page size, depending on whether TRANSPARENT_HUGEPAGE is enabled >> or not. In certain page size and THP combinations HUGETLB_PAGE_ORDER can be >> greater than MAX_ORDER, making it unusable as pageblock_order. > > Just so I understand correctly, this does not imply that we have THP that exceed the pageblock size / MAX_ORDER size, correct? Correct. MAX_ORDER gets incremented when THP is enabled. config FORCE_MAX_ZONEORDER int default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE) default "12" if (ARM64_16K_PAGES && TRANSPARENT_HUGEPAGE) default "11"