Date:	Sun, 29 Aug 2010 13:49:01 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Mikael Abrahamsson <swmike@....pp.se>
CC:	Stan Hoeppner <stan@...dwarefreak.com>,
	Christoph Lameter <cl@...ux.com>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Mel Gorman <mel@....ul.ie>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: 2.6.34.1 page allocation failure

  On 24.8.2010 22.21, Mikael Abrahamsson wrote:
> On Tue, 24 Aug 2010, Pekka Enberg wrote:
>
>> It looks to me as if tcp_create_openreq_child() is able to cope with 
>> the situation so the warning could be harmless. If that's the case, 
>> we should probably stick a __GFP_NOWARN there.
>
> What about my situation? (a complete dmesg can be had at 
> <http://swm.pp.se/dmesg.100809-2.txt.gz>)
This looks like something the kernel can't really recover from.
> [87578.494471] swapper: page allocation failure. order:0, mode:0x4020
> [87578.494476] Pid: 0, comm: swapper Not tainted 2.6.32-24-generic 
> #39-Ubuntu
> [87578.494480] Call Trace:
> [87578.494483] <IRQ>  [<ffffffff810fad0e>] 
> __alloc_pages_slowpath+0x56e/0x580
> [87578.494499]  [<ffffffff810fae7e>] __alloc_pages_nodemask+0x15e/0x1a0
> [87578.494506]  [<ffffffff8112dba7>] alloc_pages_current+0x87/0xd0
> [87578.494511]  [<ffffffff81133b17>] new_slab+0x2f7/0x310
> [87578.494516]  [<ffffffff811363c1>] __slab_alloc+0x201/0x2d0
> [87578.494522]  [<ffffffff81455fe6>] ? __netdev_alloc_skb+0x36/0x60
> [87578.494528]  [<ffffffff81137408>] 
> __kmalloc_node_track_caller+0xb8/0x180
> [87578.494532]  [<ffffffff81455fe6>] ? __netdev_alloc_skb+0x36/0x60
> [87578.494536]  [<ffffffff81455ca0>] __alloc_skb+0x80/0x190
> [87578.494540]  [<ffffffff81455fe6>] __netdev_alloc_skb+0x36/0x60
> [87578.494564]  [<ffffffffa008f5c7>] rtl8169_rx_interrupt+0x247/0x5b0 
> [r8169]
> [87578.494572]  [<ffffffffa008faad>] rtl8169_poll+0x3d/0x270 [r8169]
> [87578.494580]  [<ffffffff810397a9>] ? default_spin_lock_flags+0x9/0x10
> [87578.494586]  [<ffffffff8146029f>] net_rx_action+0x10f/0x250
> [87578.494594]  [<ffffffffa008d54e>] ? rtl8169_interrupt+0xde/0x1e0 
> [r8169]
> [87578.494600]  [<ffffffff8106e467>] __do_softirq+0xb7/0x1e0
> [87578.494605]  [<ffffffff810c52c0>] ? handle_IRQ_event+0x60/0x170
> [87578.494610]  [<ffffffff810142ec>] call_softirq+0x1c/0x30
> [87578.494614]  [<ffffffff81015cb5>] do_softirq+0x65/0xa0
> [87578.494618]  [<ffffffff8106e305>] irq_exit+0x85/0x90
> [87578.494623]  [<ffffffff81549515>] do_IRQ+0x75/0xf0
> [87578.494627]  [<ffffffff81013b13>] ret_from_intr+0x0/0x11
> [87578.494629] <EOI>  [<ffffffff8130f7cb>] ? acpi_idle_enter_c1+0xa3/0xc1
> [87578.494639]  [<ffffffff8130f7aa>] ? acpi_idle_enter_c1+0x82/0xc1
> [87578.494646]  [<ffffffff8143a5a7>] ? cpuidle_idle_call+0xa7/0x140
> [87578.494652]  [<ffffffff81011e73>] ? cpu_idle+0xb3/0x110
> [87578.494657]  [<ffffffff8153e27e>] ? start_secondary+0xa8/0xaa
> [87578.494660] Mem-Info:
> [87578.494662] Node 0 DMA per-cpu:
> [87578.494666] CPU    0: hi:    0, btch:   1 usd:   0
> [87578.494669] CPU    1: hi:    0, btch:   1 usd:   0
> [87578.494672] CPU    2: hi:    0, btch:   1 usd:   0
> [87578.494674] CPU    3: hi:    0, btch:   1 usd:   0
> [87578.494677] Node 0 DMA32 per-cpu:
> [87578.494680] CPU    0: hi:  186, btch:  31 usd: 173
> [87578.494683] CPU    1: hi:  186, btch:  31 usd:  87
> [87578.494686] CPU    2: hi:  186, btch:  31 usd: 168
> [87578.494689] CPU    3: hi:  186, btch:  31 usd:  63
> [87578.494691] Node 0 Normal per-cpu:
> [87578.494695] CPU    0: hi:  186, btch:  31 usd: 177
> [87578.494698] CPU    1: hi:  186, btch:  31 usd: 176
> [87578.494700] CPU    2: hi:  186, btch:  31 usd:  82
> [87578.494703] CPU    3: hi:  186, btch:  31 usd: 191
> [87578.494710] active_anon:22970 inactive_anon:6433 isolated_anon:0
> [87578.494711]  active_file:916528 inactive_file:914736 isolated_file:0
> [87578.494713]  unevictable:0 dirty:135959 writeback:24423 unstable:0
> [87578.494714]  free:9990 slab_reclaimable:59767 slab_unreclaimable:11135
> [87578.494716]  mapped:119343 shmem:985 pagetables:2113 bounce:0
> [87578.494719] Node 0 DMA free:15860kB min:20kB low:24kB high:28kB 
> active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB 
> unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15272kB 
> mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB 
> slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB 
> pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB 
> pages_scanned:0 all_unreclaimable? yes
> [87578.494733] lowmem_reserve[]: 0 2866 7852 7852
> [87578.494738] Node 0 DMA32 free:21420kB min:4136kB low:5168kB 
> high:6204kB active_anon:4056kB inactive_anon:5856kB 
> active_file:1322360kB inactive_file:1320432kB unevictable:0kB 
> isolated(anon):0kB isolated(file):0kB present:2935456kB mlocked:0kB 
> dirty:190824kB writeback:31900kB mapped:157676kB shmem:0kB 
> slab_reclaimable:107316kB slab_unreclaimable:15480kB kernel_stack:56kB 
> pagetables:764kB unstable:0kB bounce:0kB writeback_tmp:0kB 
> pages_scanned:0 all_unreclaimable? no
> [87578.494754] lowmem_reserve[]: 0 0 4986 4986
> [87578.494759] Node 0 Normal free:2680kB min:7192kB low:8988kB 
> high:10788kB active_anon:87824kB inactive_anon:19876kB 
> active_file:2343752kB inactive_file:2338512kB unevictable:0kB 
> isolated(anon):0kB isolated(file):0kB present:5105664kB mlocked:0kB 
> dirty:353012kB writeback:65792kB mapped:319696kB shmem:3940kB 
> slab_reclaimable:131752kB slab_unreclaimable:29060kB 
> kernel_stack:2160kB pagetables:7688kB unstable:0kB bounce:0kB 
> writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
> [87578.494775] lowmem_reserve[]: 0 0 0 0
> [87578.494779] Node 0 DMA: 3*4kB 3*8kB 3*16kB 1*32kB 2*64kB 2*128kB 
> 0*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15860kB
> [87578.494792] Node 0 DMA32: 789*4kB 765*8kB 589*16kB 1*32kB 1*64kB 
> 4*128kB 4*256kB 2*512kB 0*1024kB 0*2048kB 0*4096kB = 21356kB
> [87578.494805] Node 0 Normal: 374*4kB 4*8kB 20*16kB 1*32kB 0*64kB 
> 0*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 2648kB
You seem to have 4K pages available still. I wonder why the page 
allocator isn't giving them to SLUB?
> [87578.494818] 1832322 total pagecache pages
> [87578.494820] 0 pages in swap cache
> [87578.494823] Swap cache stats: add 0, delete 0, find 0/0
> [87578.494825] Free swap  = 0kB
> [87578.494827] Total swap = 0kB
> [87578.531041] 2064368 pages RAM
> [87578.531044] 66019 pages reserved
> [87578.531046] 1501227 pages shared
> [87578.531048] 619257 pages non-shared
> [87578.531053] SLUB: Unable to allocate memory on node -1 (gfp=0x20)
> [87578.531057]   cache: kmalloc-4096, object size: 4096, buffer size: 
> 4096, default order: 3, min order: 0
> [87578.531061]   node 0: slabs: 1322, objs: 4129, free: 0
>
> This actually made the machine go offline for hours before it for some 
> reason came back. The second time this happened it did not come back 
> (waited 8 hours).
Do you see these out-of-memory problems with 2.6.35?
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