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 CB4D4C001DF for ; Fri, 20 Oct 2023 12:33:46 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1318E8D01C9; Fri, 20 Oct 2023 08:33:46 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0E1878D0003; Fri, 20 Oct 2023 08:33:46 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F120F8D01C9; Fri, 20 Oct 2023 08:33:45 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id E16638D0003 for ; Fri, 20 Oct 2023 08:33:45 -0400 (EDT) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id A82FD120830 for ; Fri, 20 Oct 2023 12:33:45 +0000 (UTC) X-FDA: 81365781210.14.4B4D13B Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf27.hostedemail.com (Postfix) with ESMTP id B66E34001F for ; Fri, 20 Oct 2023 12:33:43 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=none; spf=pass (imf27.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=1697805224; 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-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UqmuuQbvikdamJ4rP1VHgUINjymQNLkrWGX2tZ40ZDs=; b=wajuvLJlVF3IwDnlV38NjKmngHyF3aQ0zBwLetA/fKzhb9SLqlBPmjZywRIvAbU9rpBSGs vpNimfC28NgmaajfFyJmqjjzQVJvqe0Gl0tA0g+MXu1e/TM8am1jRGgGHny3N2xCTv4LPn 9dufPdi3ufrGzPZIdi/gESpz0u0zbKc= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1697805224; a=rsa-sha256; cv=none; b=pFYVQhFuBjo/PNfuwjH5FrfuLP9BN86nAGwdeyBr0uusfE2mppJdqThtROubD3A53zOf3+ C34dY1PX1jVau7An/ujj3VEEfadZH2ZvZhQHPssIPcMILapdVcapr/8mRQTBsaq4xPyBXY Dr4Y1mCpB3NjHafNHYy6MTZGOeOx2Bw= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=none; spf=pass (imf27.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 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 8A2EB2F4; Fri, 20 Oct 2023 05:34:23 -0700 (PDT) Received: from [10.1.30.154] (XHFQ2J9959.cambridge.arm.com [10.1.30.154]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3CAA03F5A1; Fri, 20 Oct 2023 05:33:40 -0700 (PDT) Message-ID: Date: Fri, 20 Oct 2023 13:33:38 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 0/9] variable-order, large folios for anonymous memory Content-Language: en-GB To: David Hildenbrand , Andrew Morton , Matthew Wilcox , Yin Fengwei , 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: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20230929114421.3761121-1-ryan.roberts@arm.com> <6d89fdc9-ef55-d44e-bf12-fafff318aef8@redhat.com> From: Ryan Roberts In-Reply-To: <6d89fdc9-ef55-d44e-bf12-fafff318aef8@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: B66E34001F X-Rspam-User: X-Stat-Signature: e7wqudfzid9uyskjadhe8onbpumr4iw7 X-Rspamd-Server: rspam03 X-HE-Tag: 1697805223-238369 X-HE-Meta: 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 N3UjOusM NNScKOoJ7mVV0FvokfJABsikH1LcoL+3h/AanvikzG0nKRhLk3cN7aFZQvOGb+Z0b3mJLYgmmwir31XC2WNmk/hmH2PdGyNyYODAEs7udPm4iaNth4xVw0at6nJ+WjyDfUH98Dtr9xkIkQCAMrpEIxuNna9x6GlxVYbaHGKgb4yLBFPJcbvIP2S/Qo2gyDuXON5Erdi2w5jJJdqFNqLBfAt6ilQH6DyxgBfaGQiRq5NKQO1190icfYy3uPA== 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: On 06/10/2023 21:06, David Hildenbrand wrote: > On 29.09.23 13:44, Ryan Roberts wrote: >> Hi All, > [...] >> NOTE: These changes should not be merged until the prerequisites are complete. >> These are in progress and tracked at [7]. > > We should probably list them here, and classify which one we see as strict a > requirement, which ones might be an optimization. > Bringing back the discussion of prerequistes to this thread following the discussion at the mm-alignment meeting on Wednesday. Slides, updated following discussion to reflect all the agreed items that are prerequisites and enhancements, are at [1]. I've taken a closer look at the situation with khugepaged, and can confirm that it does correctly collapse anon small-sized THP into PMD-sized THP. I did notice though, that one of the khugepaged selftests (collapse_max_ptes_none) fails when small-sized THP is enabled+always. So I've fixed that test up and will add the patch to the next version of my series. So I believe the khugepaged prerequisite can be marked as done. [1] https://drive.google.com/file/d/1GnfYFpr7_c1kA41liRUW5YtCb8Cj18Ud/view?usp=sharing&resourcekey=0-U1Mj3-RhLD1JV6EThpyPyA Thanks, Ryan