linux-kernel - Re: [-next] lots of messages due to "mm, memory_hotplug: be more verbose for memory offline failures"

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Message-ID: <20181217160350.GV30879@dhcp22.suse.cz>
Date:   Mon, 17 Dec 2018 17:03:50 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Heiko Carstens <heiko.carstens@...ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Stephen Rothwell <sfr@...b.auug.org.au>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
        linux-s390@...r.kernel.org
Subject: Re: [-next] lots of messages due to "mm, memory_hotplug: be more
 verbose for memory offline failures"

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