[Xen-devel] [79030.229547] motion: page allocation failure: order:6, mode:0xd4

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Hi Konrad,

In one of my domU's to which I pci passthrough USB cards with a videograbber 
connected to it, the videocapture bails out after running for quite some time 
with the stacktrace below.
I guess i'm interpreting the mem-info below wrong, but i fail to see why it 
can't allocate those 185088 bytes.

Could you shed some light ? it's probably the coherent requirement ?

--
Sander



[79030.229547] motion: page allocation failure: order:6, mode:0xd4
[79030.229572] Pid: 24513, comm: motion Not tainted 
3.0.0-rc4-xen-konrad-master-20110621+ #4
[79030.229581] Call Trace:
[79030.229594]  [<ffffffff810e1563>] warn_alloc_failed+0xf3/0x140
[79030.229606]  [<ffffffff810080df>] ? xen_restore_fl_direct_reloc+0x4/0x4
[79030.229616]  [<ffffffff810e22b3>] __alloc_pages_nodemask+0x533/0x700
[79030.229625]  [<ffffffff810080f2>] ? check_events+0x12/0x20
[79030.229635]  [<ffffffff810e2547>] __get_free_pages+0x17/0x80
[79030.229645]  [<ffffffff813f0af6>] xen_swiotlb_alloc_coherent+0x56/0x140
[79030.229656]  [<ffffffff814ea68e>] ? usb_alloc_urb+0x1e/0x50
[79030.229666]  [<ffffffff814f00f5>] hcd_buffer_alloc+0x95/0x150
[79030.229676]  [<ffffffff814e1806>] usb_alloc_coherent+0x26/0x30
[79030.229686]  [<ffffffff8158d0a1>] em28xx_init_isoc+0x131/0x3a0
[79030.229696]  [<ffffffff81586f1e>] buffer_prepare+0xbe/0x150
[79030.229706]  [<ffffffff815a2ff7>] videobuf_qbuf+0x237/0x5b0
[79030.229716]  [<ffffffff8158663c>] vidioc_qbuf+0x5c/0x60
[79030.229726]  [<ffffffff81564fa0>] __video_do_ioctl+0x33b0/0x7660
[79030.229736]  [<ffffffff810080df>] ? xen_restore_fl_direct_reloc+0x4/0x4
[79030.229746]  [<ffffffff817845f9>] ? _raw_spin_unlock_irqrestore+0x69/0x80
[79030.229757]  [<ffffffff810416fe>] ? __wake_up_sync_key+0x5e/0x80
[79030.229766]  [<ffffffff815865e0>] ? vidioc_dqbuf+0x80/0x80
[79030.229777]  [<ffffffff81663f6e>] ? sock_def_readable+0x3e/0x70
[79030.229787]  [<ffffffff8173f9ce>] ? unix_dgram_sendmsg+0x62e/0x6d0
[79030.229797]  [<ffffffff816603bd>] ? sock_sendmsg+0xfd/0x120
[79030.229806]  [<ffffffff815a4d63>] ? __videobuf_mmap_mapper+0x123/0x200
[79030.229816]  [<ffffffff8156182d>] video_usercopy+0x17d/0x4c0
[79030.229825]  [<ffffffff81561bf0>] ? v4l2_video_std_construct+0x60/0x60
[79030.229835]  [<ffffffff81561b85>] video_ioctl2+0x15/0x20
[79030.229844]  [<ffffffff8156078c>] v4l2_ioctl+0xac/0x170
[79030.229854]  [<ffffffff811314c4>] do_vfs_ioctl+0xa4/0x5a0
[79030.229864]  [<ffffffff81131a61>] sys_ioctl+0xa1/0xb0
[79030.232058]  [<ffffffff81785342>] system_call_fastpath+0x16/0x1b
[79030.232058] Mem-Info:
[79030.232058] DMA per-cpu:
[79030.232058] CPU    0: hi:    0, btch:   1 usd:   0
[79030.232058] DMA32 per-cpu:
[79030.232058] CPU    0: hi:  186, btch:  31 usd:   0
[79030.232058] active_anon:255 inactive_anon:755 isolated_anon:0
[79030.232058]  active_file:27673 inactive_file:28297 isolated_file:0
[79030.232058]  unevictable:0 dirty:7 writeback:0 unstable:0
[79030.232058]  free:2965 slab_reclaimable:40398 slab_unreclaimable:4116
[79030.232058]  mapped:2942 shmem:6 pagetables:946 bounce:0
[79030.232058] DMA free:2104kB min:84kB low:104kB high:124kB active_anon:0kB 
inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB 
isolated(anon):0kB isolated(file):0kB present:15704kB mlocked:0kB dirty:0kB 
writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:13148kB 
slab_unreclaimable:676kB kernel_stack:0kB pagetables:0kB unstable:0kB 
bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
[79030.232058] lowmem_reserve[]: 0 497 497 497
[79030.232058] DMA32 free:9756kB min:2808kB low:3508kB high:4212kB 
active_anon:1020kB inactive_anon:3020kB active_file:110692kB 
inactive_file:113188kB unevictable:0kB isolated(anon):0kB isolated(file):0kB 
present:509040kB mlocked:0kB dirty:28kB writeback:0kB mapped:11768kB shmem:24kB 
slab_reclaimable:148444kB slab_unreclaimable:15788kB kernel_stack:488kB 
pagetables:3784kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 
all_unreclaimable? no
[79030.232058] lowmem_reserve[]: 0 0 0 0
[79030.232058] DMA: 50*4kB 30*8kB 14*16kB 3*32kB 1*64kB 0*128kB 1*256kB 0*512kB 
1*1024kB 0*2048kB 0*4096kB = 2104kB
[79030.232058] DMA32: 405*4kB 91*8kB 65*16kB 63*32kB 32*64kB 16*128kB 1*256kB 
0*512kB 0*1024kB 0*2048kB 0*4096kB = 9756kB
[79030.232058] 56318 total pagecache pages
[79030.232058] 342 pages in swap cache
[79030.232058] Swap cache stats: add 15097, delete 14755, find 711259/712031
[79030.232058] Free swap  = 507648kB
[79030.232058] Total swap = 524284kB
[79030.232058] 133104 pages RAM
[79030.232058] 24943 pages reserved
[79030.232058] 55445 pages shared
[79030.232058] 52554 pages non-shared
[79030.232058] unable to allocate 185088 bytes for transfer buffer 4


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