From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Wed, 16 Apr 2008 14:22:39 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: Warning on memory offline (and possible in usual migration?)
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To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Christoph Lameter <clameter@sgi.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, npiggin@suse.de, Andrew Morton <akpm@linux-foundation.org>, GOTO <y-goto@jp.fujitsu.com>
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On Wed, 16 Apr 2008 12:10:03 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:

> BTW, a bit off-topic.
> I found I can't do memory offline when I use SLAB not SLUB, 
> This is because some not-migratable page are in ZONE_MOVABLE.
> 
> here is zonestat.
> ==
> Node 1, zone  Movable
>   pages free     193181
>         min      190
>         low      237
>         high     285
>         scanned  0 (a: 0 i: 0)
>         spanned  196608
>         present  195744
>     nr_free_pages 193181
>     nr_inactive  102
>     nr_active    2154
>     nr_anon_pages 1851
>     nr_mapped    365
>     nr_file_pages 407
>     nr_dirty     0
>     nr_writeback 0
>     nr_slab_reclaimable 101
>     nr_slab_unreclaimable 920
>     nr_page_table_pages 0
>     nr_unstable  0
>     nr_bounce    0
>     nr_vmscan_write 0
>     numa_hit     0
>     numa_miss    77029
>     numa_foreign 0
>     numa_interleave 0
>     numa_local   0
>     numa_other   76119
>     pgpgin       910
>         protection: (0, 0, 0)
> ==
> Hmm, I guess SLAB's gfp_mask handling is wrong .....
> 
This was because GFP_THISNODE is buggy. I'll send a patch soon.

Thanks,
-Kame

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