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 70E96C4321E for ; Fri, 2 Dec 2022 16:58:44 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B9BAC6B0071; Fri, 2 Dec 2022 11:58:43 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B4CEB6B0073; Fri, 2 Dec 2022 11:58:43 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A14416B0074; Fri, 2 Dec 2022 11:58:43 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 93CE66B0071 for ; Fri, 2 Dec 2022 11:58:43 -0500 (EST) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 381CD1409AB for ; Fri, 2 Dec 2022 16:58:43 +0000 (UTC) X-FDA: 80197975326.15.F0C6908 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf28.hostedemail.com (Postfix) with ESMTP id 02D9FC000D for ; Fri, 2 Dec 2022 16:58:41 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=GCVPyhnZ; spf=none (imf28.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=1670000322; 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=AByfye9kZ08QMclSv5a/zeZjsXoVdkjY2EW7Zezg8J8=; b=1VnzbPgoAxbBCnxUjxLKMiBw3JmJEY9Fb73XqCRUUYEeR4u/bHdiSMJgNSJvwJbJ2D/4q8 t7/ArrZBlH+cEbvzZr9zRnQaxG+XmNoH+VGQH4tD7Wa35U0oJL3H6K0Qn70kZCqm1SvhLC 7DkXBGdAQ9LCSXzMUo8gnwUEVRkoUCk= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=GCVPyhnZ; spf=none (imf28.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-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1670000322; a=rsa-sha256; cv=none; b=CwhrJxgOkc3idaEx9IleAGVpnZO6auIZrcDZDy6ISCeedZasrBqukgY48eA6gu3gpExBU+ mPw9ee8wMo9WpY+VFET6pnM7AE9gGTfHr17HXDcjk5WRAUhbhBE1tw6NYAKY2rmGVq6uS8 uzmTaagDIwBeuUVulPzneTTgFF6rzPU= 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=AByfye9kZ08QMclSv5a/zeZjsXoVdkjY2EW7Zezg8J8=; b=GCVPyhnZKm6N8EQhC0jiNnkUWA UlWc9Gr9UVucYX5F89Hw7VRJ3Q9g0voo1Gwypxu2jg6ALe6uLcspZk546XC7RUQjz5ryxiWXDZijx lAs5XQ/agJYkxWo5St4VNYd68dMtYx5TP3RsOkuUNltxYdB8rLHQGQcAZG9BiBzjQUFduoKzfTBkM Oe4zcJNFNqQjrdq4yIQ1ydCzP3XyeYPmxtk2Mf097/TkG3DdUc5qTVVd10Y3fVxzzDtxOO+q/IU2y PGNJbrlOoD8rzXeSjzZsTgSa4HWiEKAZFr7+E+KKom8TbxJpuP1XMMtuecz+4P/A2DvvMF2piFGHn dkYZsxig==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1p19N5-000LMM-0a; Fri, 02 Dec 2022 16:58:43 +0000 Date: Fri, 2 Dec 2022 16:58:42 +0000 From: Matthew Wilcox To: Thorsten Leemhuis Cc: bugzilla-daemon@kernel.org, linux-mm@kvack.org, Andrew Morton , decedion@gmail.com, mmp.dux@gmail.com Subject: Re: [Bug 216646] having TRANSPARENT_HUGEPAGE enabled hangs some applications (supervisor read access in kernel mode) Message-ID: References: <20221121125400.334190a6d2791b0c9afbfea0@linux-foundation.org> <220fd094-7cf1-9d17-8380-98d5663dc5da@leemhuis.info> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <220fd094-7cf1-9d17-8380-98d5663dc5da@leemhuis.info> X-Spamd-Result: default: False [-3.13 / 9.00]; BAYES_HAM(-5.43)[98.75%]; SUSPICIOUS_RECIPS(1.50)[]; SUBJECT_HAS_UNDERSCORES(1.00)[]; R_DKIM_ALLOW(-0.20)[infradead.org:s=casper.20170209]; MIME_GOOD(-0.10)[text/plain]; RCVD_NO_TLS_LAST(0.10)[]; R_SPF_NA(0.00)[no SPF record]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_SIGNED(0.00)[hostedemail.com:s=arc-20220608:i=1]; RCVD_COUNT_TWO(0.00)[2]; DKIM_TRACE(0.00)[infradead.org:+]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCPT_COUNT_FIVE(0.00)[6]; FROM_HAS_DN(0.00)[]; MID_RHS_MATCH_FROMTLD(0.00)[]; TO_DN_SOME(0.00)[]; DMARC_NA(0.00)[infradead.org]; TAGGED_RCPT(0.00)[]; ARC_NA(0.00)[] X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 02D9FC000D X-Stat-Signature: puepqkx8ew9c8efnii16zt5mryg9dd8i X-HE-Tag: 1670000321-462762 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 Fri, Dec 02, 2022 at 12:56:40PM +0100, Thorsten Leemhuis wrote: > On 21.11.22 21:54, Andrew Morton wrote: > > On Mon, 21 Nov 2022 18:34:34 +0000 bugzilla-daemon@kernel.org wrote: > > > >> https://bugzilla.kernel.org/show_bug.cgi?id=216646 > >> > >> --- Comment #6 from Mikhail Pletnev (mmp.dux@gmail.com) --- > >> i can't figure out how to use git send-email, so i will post this here instead > >> > >>>>> git bisect good 1854bc6e2420472676c5c90d3d6b15f6cd640e40 > >> > >>> I suspect this is where your bisection went astray. This should have > >>> been bad and it led you to the wrong commit. > >> > >> so i've applied your suggestion and did some more bisecting and arrived at > >> this: > > That was 793917d997df ("mm/readahead: Add large folio readahead") which > is also from Matthew. > > > Folks, thanks for continuing to work on this. > > Well, since then nothing happened. :-/ Or have I missed something? > > Matthew, do you still have this on your radar? No, things tend to fall off my radar after a week or two of inactivity. Particularly since I went on holiday. Since I wasn't cc'd on the bug, the activity was completely invisible to me. Landing on 793917d997df makes a lot more sense. That's where we actually start using large folios. It doesn't really help narrow down the problem. I have an idea for what it might be; patch to try will follow. But I'll need feedback by email.