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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C5ADC00A98 for ; Fri, 20 Oct 2023 12:33:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377301AbjJTMdq (ORCPT ); Fri, 20 Oct 2023 08:33:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36660 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1377266AbjJTMdo (ORCPT ); Fri, 20 Oct 2023 08:33:44 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 03EAED52 for ; Fri, 20 Oct 2023 05:33:43 -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 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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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