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 0269AEB64D9 for ; Mon, 10 Jul 2023 16:57:48 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7D1416B0074; Mon, 10 Jul 2023 12:57:48 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 780E56B0075; Mon, 10 Jul 2023 12:57:48 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 66FB46B0078; Mon, 10 Jul 2023 12:57:48 -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 598EF6B0074 for ; Mon, 10 Jul 2023 12:57:48 -0400 (EDT) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 27126801AF for ; Mon, 10 Jul 2023 16:57:48 +0000 (UTC) X-FDA: 80996309016.03.D8879AA Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf01.hostedemail.com (Postfix) with ESMTP id B897340010 for ; Mon, 10 Jul 2023 16:57:45 +0000 (UTC) Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=SC+66HP1; spf=none (imf01.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1689008266; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=5hY1mK8fZM8mievQWkaMMm4+MneK9G0ZnnK8toOvx5I=; b=z1Kr9OCiBGGOwZKNOPfgsZKAHo6p4QW5YhAUu7+ZtDZHhxFwB9k7V6Y1Z8OoHIbDX5jmL5 z8zjqUzREXnJjozAqwojsDA5PMG3nKC/vs+FEWJbwyyFtz354ukAh2+/zQpijv2yXjxNKr efrIxOUScy+JvaPAaGzQLo33Eo66qN0= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1689008266; a=rsa-sha256; cv=none; b=KMOfUzQCe9MP/djP/RejIW7gJECpoN7PG2P/mmwsS6PgVvaAz5FRhU5A2g6OQQ6o0uXIwm 21dgHnS/KPp7xPi+gqeP0lo7InmX9yKnCeoofvgH5I1MfpFwBJFlVGd+eclnh4q0AkrCQu 9VYAXkMJRFgVIOweKkIW4SDyaRm5mxM= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=SC+66HP1; spf=none (imf01.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=5hY1mK8fZM8mievQWkaMMm4+MneK9G0ZnnK8toOvx5I=; b=SC+66HP1BlDPbpQxGahSSWJ35M fT6K1bP7MUlouKf8yvfhfswwGpb/mbAW3m53gPRX7XBqo330JJQl9BvEOkYZh9wH9u9cQ8geX4hTj 68Cz11xkwt24Pk9OFzlaAxAN/qJIWRzpgNkNBBtS46ucnHNBHeVMIt12ctwIhseska14knK2K9hCp thirdKfVxI4CUfFStNeBw0PlX+Z64djfBnS195SpYcbnvGeKb3aQFH3x4MU2CrZ1zp408NZPDncrH wJ17RZlMyUJt9gRwxUDESpCoAjeT3wznlCKDgG2OM/iiDflUJ9LP8iZVDvHM0Is37WHh991T39jps usjWds5w==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1qIuCS-00EljV-7C; Mon, 10 Jul 2023 16:57:24 +0000 Date: Mon, 10 Jul 2023 17:57:24 +0100 From: Matthew Wilcox To: Ryan Roberts Cc: David Hildenbrand , Andrew Morton , "Kirill A. Shutemov" , Yin Fengwei , Yu Zhao , Catalin Marinas , Will Deacon , Anshuman Khandual , Yang Shi , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 0/5] variable-order, large folios for anonymous memory Message-ID: References: <20230703135330.1865927-1-ryan.roberts@arm.com> <78159ed0-a233-9afb-712f-2df1a4858b22@redhat.com> <4d4c45a2-0037-71de-b182-f516fee07e67@arm.com> <8304d1e2-2848-858d-e25b-5eeef8606754@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8304d1e2-2848-858d-e25b-5eeef8606754@arm.com> X-Stat-Signature: yqyopq51bcq1nonguwcq1ec5pp48jnt9 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: B897340010 X-Rspam-User: X-HE-Tag: 1689008265-397532 X-HE-Meta: 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 Pdp7olYV LJdn25pAhR2QaaLKfhaRYT25JIRnf6HzGnTkQm6gADXfoTMVk9bN0vv44kyU47M37Dl1RvLWYDTGtmYlDtviwu6nGrVKFSs7E8M2y7/qIG6Wuid80vaWIDgAtwyjAVdbsRF7bDfqAvGFEy+Q= 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 Mon, Jul 10, 2023 at 11:07:47AM +0100, Ryan Roberts wrote: > I think this compaction issue also affects large folios in the page cache? So > really it is a pre-existing bug in the code base that needs to be fixed > independently of large anon folios? Should I assume you are tackling this, Matthew? It does need to be fixed independently of large anon folios. Said fix should probably be backported to 6.1 once it's suitably stable. However, I'm not working on it. I have a lot of projects and this one's a missed-opportunity, not a show-stopper. Sounds like Zi Yan might be interested in tackling it though!