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 F16F0C433FE for ; Mon, 7 Nov 2022 15:43:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7E59E6B0071; Mon, 7 Nov 2022 10:43:54 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 7955C8E0001; Mon, 7 Nov 2022 10:43:54 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 65D386B0073; Mon, 7 Nov 2022 10:43:54 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 570936B0071 for ; Mon, 7 Nov 2022 10:43:54 -0500 (EST) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 3234640416 for ; Mon, 7 Nov 2022 15:43:54 +0000 (UTC) X-FDA: 80107066788.11.BF037E4 Received: from outbound-smtp42.blacknight.com (outbound-smtp42.blacknight.com [46.22.139.226]) by imf10.hostedemail.com (Postfix) with ESMTP id 94C28C0004 for ; Mon, 7 Nov 2022 15:43:53 +0000 (UTC) Received: from mail.blacknight.com (pemlinmail03.blacknight.ie [81.17.254.16]) by outbound-smtp42.blacknight.com (Postfix) with ESMTPS id C63AF19DB for ; Mon, 7 Nov 2022 15:43:51 +0000 (GMT) Received: (qmail 16486 invoked from network); 7 Nov 2022 15:43:51 -0000 Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[84.203.198.246]) by 81.17.254.9 with ESMTPSA (AES256-SHA encrypted, authenticated); 7 Nov 2022 15:43:51 -0000 Date: Mon, 7 Nov 2022 15:43:50 +0000 From: Mel Gorman To: "Akira Naribayashi (Fujitsu)" Cc: "akpm@linux-foundation.org" , "vbabka@suse.cz" , "rientjes@google.com" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" Subject: Re: [PATCH] mm, compaction: fix fast_isolate_around() to stay within boundaries Message-ID: <20221107154350.34brdl3ms2ve5wud@techsingularity.net> References: <20221027132557.5f724149bd5753036f41512a@linux-foundation.org> <20221031073559.36021-1-a.naribayashi@fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=none; spf=pass (imf10.hostedemail.com: domain of mgorman@techsingularity.net designates 46.22.139.226 as permitted sender) smtp.mailfrom=mgorman@techsingularity.net; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1667835833; a=rsa-sha256; cv=none; b=S4svg37xzE1rtkQTyRhmviYaXB85cRX7+rKn9qmCgsHYDxsJ2/nZN28FHZbsdQIQheAzsx B0IosphwI1gcLUv+egf7iTJRmUyxAGn/pSLBQbTHefuhPs3UWN9AZ2tFIEWNzOCpXPfurm QNwPVBG/+uKzvvyz+qyfY31mVKEuIS8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1667835833; 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; bh=+M5SjmAI6UjKq8STZeqQrwwxbkQJX+spvJuOBD6I7WA=; b=j0QnsyIZ8GQ6Ow7dmnJGreSGiDrIEVHcIEzE7pg4X0y3vqdVb0Pb7NOBFZawXrN34sU8mr gPyr4AKLRMyGkBUDNMiXKx0Pd/yiAGFpu9B+dj3uhGeiIJijXzhZhcd/+aSqhujpgckR8D 2tM7LHEpj5iR5OCKM2KYXaWyCjStTQ0= X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 94C28C0004 Authentication-Results: imf10.hostedemail.com; dkim=none; spf=pass (imf10.hostedemail.com: domain of mgorman@techsingularity.net designates 46.22.139.226 as permitted sender) smtp.mailfrom=mgorman@techsingularity.net; dmarc=none X-Stat-Signature: iy6myzxujcrbzkkpdkg1zamkq8xnqtg4 X-Rspam-User: X-HE-Tag: 1667835833-167701 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Nov 07, 2022 at 12:32:34PM +0000, Akira Naribayashi (Fujitsu) wrote: > > Under what circumstances will this panic occur? I assume those > > circumstnces are pretty rare, give that 6e2b7044c1992 was nearly two > > years ago. > > > > Did you consider the desirability of backporting this fix into earlier > > kernels? > > > Panic can occur on systems with multiple zones in a single pageblock. > Please provide an example of the panic and the zoneinfo. > The reason it is rare is that it only happens in special configurations. How is this special configuration created? -- Mel Gorman SUSE Labs