From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Hocko Subject: Re: [-next] lots of messages due to "mm, memory_hotplug: be more verbose for memory offline failures" Date: Mon, 17 Dec 2018 17:03:50 +0100 Message-ID: <20181217160350.GV30879@dhcp22.suse.cz> References: <20181217155922.GC3560@osiris> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20181217155922.GC3560@osiris> Sender: linux-kernel-owner@vger.kernel.org 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 List-Id: linux-next.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