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Date: Wed, 21 Oct 2009 14:16:56 -0700 (PDT)
From: David Rientjes <rientjes@google.com>
X-X-Sender: rientjes@chino.kir.corp.google.com
To: Jiri Kosina <jkosina@suse.cz>
cc: Stephan von Krawczynski <skraw@ithnet.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Greg Kroah-Hartman <gregkh@suse.de>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>, Frans Pop <elendil@planet.nl>,
       Mel Gorman <mel@csn.ul.ie>, Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: page allocation failure message kernel 2.6.31.4 (tty-related)
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On Wed, 21 Oct 2009, Jiri Kosina wrote:

> [ tty related CCs added ]
> 

I think this is probably a duplicate of the GFP_ATOMIC page allocator 
issue at http://bugzilla.kernel.org/show_bug.cgi?id=14141 more than a tty 
issue.

Have we tried rolling back the refactored page allocator changes in 2.6.31 
to see if the logic has changed in other ways unrelated to kswapd?  
There's subtleties like where rt tasks are given ALLOC_HARDER even when 
in_interrupt() that are different from previous kernels and could reduce 
the amount of ALLOC_HIGH and ALLOC_HARDER memory that can be allocated.

> On Tue, 20 Oct 2009, Stephan von Krawczynski wrote:
> 
> > Hello all,
> > 
> > is this something to worry about, I saw several of those:
> > 
> > Oct 20 11:25:41 box kernel: ssh: page allocation failure. order:1, mode:0x20
> > Oct 20 11:25:41 box kernel: Pid: 2970, comm: ssh Tainted: G   M       2.6.31.4 #1
> > Oct 20 11:25:41 box kernel: Call Trace:
> > Oct 20 11:25:41 box kernel:  [<c105545c>] ? __alloc_pages_nodemask+0x404/0x446
> > Oct 20 11:25:41 box kernel:  [<c106e1d1>] ? cache_alloc_refill+0x249/0x42d
> > Oct 20 11:25:41 box kernel:  [<c106e41c>] ? __kmalloc+0x67/0x9e
> > Oct 20 11:25:41 box kernel:  [<c1147c5a>] ? tty_buffer_request_room+0xa9/0x112
> > Oct 20 11:25:42 box kernel:  [<c1147deb>] ? tty_insert_flip_string+0x24/0x90
> > Oct 20 11:25:42 box kernel:  [<c114869e>] ? pty_write+0x25/0x3f
> > Oct 20 11:25:42 box kernel:  [<c1144b6f>] ? n_tty_write+0x23d/0x2d5
> > Oct 20 11:25:42 box kernel:  [<c1021cc7>] ? default_wake_function+0x0/0x8
> > Oct 20 11:25:42 box kernel:  [<c1142ab7>] ? tty_write+0x144/0x1b3
> > Oct 20 11:25:42 box kernel:  [<c1144932>] ? n_tty_write+0x0/0x2d5
> > Oct 20 11:25:42 box kernel:  [<c1142973>] ? tty_write+0x0/0x1b3
> > Oct 20 11:25:42 box kernel:  [<c107238b>] ? vfs_write+0x84/0x105
> > Oct 20 11:25:42 box kernel:  [<c10724a4>] ? sys_write+0x3c/0x63
> > Oct 20 11:25:42 box kernel:  [<c1002804>] ? sysenter_do_call+0x12/0x22
> > Oct 20 11:25:44 box kernel: DMA per-cpu:
> > Oct 20 11:25:44 box kernel: CPU    0: hi:    0, btch:   1 usd:   0
> > Oct 20 11:25:44 box kernel: CPU    1: hi:    0, btch:   1 usd:   0
> > Oct 20 11:25:44 box kernel: Normal per-cpu:
> > Oct 20 11:25:44 box kernel: CPU    0: hi:  186, btch:  31 usd: 193
> > Oct 20 11:25:44 box kernel: CPU    1: hi:  186, btch:  31 usd:  46
> > Oct 20 11:25:44 box kernel: HighMem per-cpu:
> > Oct 20 11:25:44 box kernel: CPU    0: hi:  186, btch:  31 usd: 157
> > Oct 20 11:25:44 box kernel: CPU    1: hi:  186, btch:  31 usd: 142
> > Oct 20 11:25:44 box kernel: Active_anon:89762 active_file:96664 inactive_anon:23257
> > Oct 20 11:25:44 box kernel:  inactive_file:119147 unevictable:0 dirty:53 writeback:0 unstable:0
> > Oct 20 11:25:45 box kernel:  free:569624 slab:38452 mapped:14421 pagetables:977 bounce:0
> > Oct 20 11:25:45 box kernel: DMA free:3488kB min:64kB low:80kB high:96kB active_anon:0kB inactive_anon:0kB active_file:8980kB inactive_file:3024kB unevictable:0kB present:15804kB pages_scanned:0 all_unreclaima
> > Oct 20 11:25:45 box kernel: lowmem_reserve[]: 0 865 3698 3698
> > Oct 20 11:25:45 box kernel: Normal free:5468kB min:3728kB low:4660kB high:5592kB active_anon:0kB inactive_anon:0kB active_file:324840kB inactive_file:330196kB unevictable:0kB present:885944kB pages_scanned:0
> > Oct 20 11:25:45 box kernel: lowmem_reserve[]: 0 0 22669 22669
> > Oct 20 11:25:45 box kernel: HighMem free:2269540kB min:512kB low:3564kB high:6616kB active_anon:359048kB inactive_anon:93028kB active_file:52836kB inactive_file:143368kB unevictable:0kB present:2901640kB page
> > Oct 20 11:25:45 box kernel: lowmem_reserve[]: 0 0 0 0
> > Oct 20 11:25:45 box kernel: DMA: 172*4kB 6*8kB 0*16kB 0*32kB 3*64kB 2*128kB 3*256kB 3*512kB 0*1024kB 0*2048kB 0*4096kB = 3488kB
> > Oct 20 11:25:45 box kernel: Normal: 1232*4kB 83*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 5592kB
> > Oct 20 11:25:45 box kernel: HighMem: 45*4kB 80*8kB 69*16kB 29*32kB 29*64kB 22*128kB 14*256kB 9*512kB 3*1024kB 3*2048kB 548*4096kB = 2269540kB
> > Oct 20 11:25:45 box kernel: 216788 total pagecache pages
> > Oct 20 11:25:45 box kernel: 0 pages in swap cache
> > Oct 20 11:25:45 box kernel: Swap cache stats: add 0, delete 0, find 0/0
> > Oct 20 11:25:45 box kernel: Free swap  = 2104472kB
> > Oct 20 11:25:45 box kernel: Total swap = 2104472kB
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