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 X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37978C5CFFE for ; Tue, 11 Dec 2018 09:37:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F292420811 for ; Tue, 11 Dec 2018 09:37:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F292420811 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726258AbeLKJhr (ORCPT ); Tue, 11 Dec 2018 04:37:47 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54640 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726243AbeLKJhq (ORCPT ); Tue, 11 Dec 2018 04:37:46 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5A3363004E78; Tue, 11 Dec 2018 09:37:46 +0000 (UTC) Received: from [10.36.117.115] (ovpn-117-115.ams2.redhat.com [10.36.117.115]) by smtp.corp.redhat.com (Postfix) with ESMTP id 993655D9CC; Tue, 11 Dec 2018 09:37:44 +0000 (UTC) Subject: Re: [PATCH] mm, memory_hotplug: Don't bail out in do_migrate_range prematurely To: osalvador@suse.de, akpm@linux-foundation.org Cc: mhocko@suse.com, pasha.tatashin@soleen.com, dan.j.williams@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, owner-linux-mm@kvack.org References: <20181211085042.2696-1-osalvador@suse.de> <01021c8571af27995acbaaca7a1a68f0@suse.de> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <01021c8571af27995acbaaca7a1a68f0@suse.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.47]); Tue, 11 Dec 2018 09:37:46 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11.12.18 09:57, osalvador@suse.de wrote: > On 2018-12-11 09:50, Oscar Salvador wrote: > >> - } else { >> - pr_warn("failed to isolate pfn %lx\n", pfn); >> - dump_page(page, "isolation failed"); >> - put_page(page); >> - /* Because we don't have big zone->lock. we should >> - check this again here. */ >> - if (page_count(page)) { >> - not_managed++; >> - ret = -EBUSY; >> - break; > > I forgot that here we should at least leave the put_page(). > But leave also the dump_page() and the pr_warn(). > > --- a/mm/memory_hotplug.c > +++ b/mm/memory_hotplug.c > @@ -1394,6 +1394,10 @@ do_migrate_range(unsigned long start_pfn, > unsigned long end_pfn) > inc_node_page_state(page, > NR_ISOLATED_ANON + > > page_is_file_cache(page)); > > + } else { > + pr_warn("failed to isolate pfn %lx\n", pfn); > + dump_page(page, "isolation failed"); > + put_page(page); When we're stuck with one problematic page, and we keep looping over that function, won't that print out *way too much* messages? Shouldn't that be rate limited somehow (same applies to other callers in this file) > } > } > if (!list_empty(&source)) { > -- Thanks, David / dhildenb