From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg1-f198.google.com (mail-pg1-f198.google.com [209.85.215.198]) by kanga.kvack.org (Postfix) with ESMTP id E16088E0033 for ; Mon, 17 Dec 2018 11:03:54 -0500 (EST) Received: by mail-pg1-f198.google.com with SMTP id u17so10942267pgn.17 for ; Mon, 17 Dec 2018 08:03:54 -0800 (PST) Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id o127si12271100pfo.251.2018.12.17.08.03.53 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 17 Dec 2018 08:03:53 -0800 (PST) Date: Mon, 17 Dec 2018 17:03:50 +0100 From: Michal Hocko Subject: Re: [-next] lots of messages due to "mm, memory_hotplug: be more verbose for memory offline failures" Message-ID: <20181217160350.GV30879@dhcp22.suse.cz> References: <20181217155922.GC3560@osiris> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181217155922.GC3560@osiris> Sender: owner-linux-mm@kvack.org List-ID: To: Heiko Carstens Cc: Andrew Morton , Oscar Salvador , Anshuman Khandual , Stephen Rothwell , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-next@vger.kernel.org, linux-s390@vger.kernel.org On Mon 17-12-18 16:59:22, Heiko Carstens wrote: > Hi Michal, > > with linux-next as of today on s390 I see tons of messages like > > [ 20.536664] page dumped because: has_unmovable_pages > [ 20.536792] page:000003d081ff4080 count:1 mapcount:0 mapping:000000008ff88600 index:0x0 compound_mapcount: 0 > [ 20.536794] flags: 0x3fffe0000010200(slab|head) > [ 20.536795] raw: 03fffe0000010200 0000000000000100 0000000000000200 000000008ff88600 > [ 20.536796] raw: 0000000000000000 0020004100000000 ffffffff00000001 0000000000000000 > [ 20.536797] page dumped because: has_unmovable_pages > [ 20.536814] page:000003d0823b0000 count:1 mapcount:0 mapping:0000000000000000 index:0x0 > [ 20.536815] flags: 0x7fffe0000000000() > [ 20.536817] raw: 07fffe0000000000 0000000000000100 0000000000000200 0000000000000000 > [ 20.536818] raw: 0000000000000000 0000000000000000 ffffffff00000001 0000000000000000 > > bisect points to b323c049a999 ("mm, memory_hotplug: be more verbose for memory offline failures") > which is the first commit with which the messages appear. I would bet this is CMA allocator. How much is tons? Maybe we want a rate limit or the other user is not really interested in them at all? -- Michal Hocko SUSE Labs