Re: [Bugme-new] [Bug 15709] New: swapper page allocation failure

[Andrew Morton <akpm@linux-foundation.org>]

(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Wed, 7 Apr 2010 10:29:20 GMT
bugzilla-daemon@bugzilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=15709
> 
>            Summary: swapper page allocation failure
>            Product: Memory Management
>            Version: 2.5
>     Kernel Version: 2.6.32 and 2.6.33
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Slab Allocator
>         AssignedTo: akpm@linux-foundation.org
>         ReportedBy: kernel@tauceti.net
>         Regression: No
> 
> 
> Created an attachment (id=25903)
>  --> (https://bugzilla.kernel.org/attachment.cgi?id=25903)
> dmesg output
> 
> I'm having problems with "swapper page allocation failure's" since upgrading
> from kernel 2.6.30 to 2.6.32/2.6.33. The problems occur inside a kernel virtual
> maschine (KVM). Running Gentoo with kernel 2.6.32 as host which works fine. As
> long as kernel 2.6.30 is used as guest kernel the guest runs fine. But after
> upgrading to 2.6.32 and 2.6.33 I get "swapper page allocation failure's" (see
> attachment of dmesg output). The guest is only running a Apache webserver and
> serves files from a NFS share. It has 1 GB RAM and 2 virtual CPUs. I've tried
> different kernel configurations (e.g. a unmodified version from Sabayon Linux
> Distribution) but doesn't help. Load of the guest (and host) is very low.
> Network traffic is about 20-50 MBit/s.
> 

hm, this is a regression.

: [  454.006706] users: page allocation failure. order:0, mode:0x20
: [  454.006712] Pid: 7992, comm: users Not tainted 2.6.34-rc3-git6 #2
: [  454.006714] Call Trace:
: [  454.006717]  <IRQ>  [<ffffffff8109dff7>] __alloc_pages_nodemask+0x5c8/0x615
: [  454.006796]  [<ffffffff817860ce>] ? ip_local_deliver+0x65/0x6d
: [  454.006820]  [<ffffffff810c39c4>] alloc_pages_current+0x96/0x9f
: [  454.006842]  [<ffffffff8167f2c7>] try_fill_recv+0x5e/0x20f
: [  454.006846]  [<ffffffff8167fe13>] virtnet_poll+0x52a/0x5c7
: [  454.006858]  [<ffffffff8104fe74>] ? run_timer_softirq+0x1dc/0x1f4
: [  454.006873]  [<ffffffff8176035d>] net_rx_action+0xad/0x1a5
: [  454.006882]  [<ffffffff8104b6cd>] __do_softirq+0x9c/0x127
: [  454.006897]  [<ffffffff81008ffc>] call_softirq+0x1c/0x30
: [  454.006901]  [<ffffffff8100af01>] do_softirq+0x41/0x7e
: [  454.006904]  [<ffffffff8104b3e3>] irq_exit+0x36/0x75
: [  454.006907]  [<ffffffff8100a5ee>] do_IRQ+0xaa/0xc1
: [  454.006926]  [<ffffffff8183bc13>] ret_from_intr+0x0/0x11
: [  454.006928]  <EOI>  [<ffffffff81026b25>] ? kvm_deferred_mmu_op+0x5e/0xe7
: [  454.006942]  [<ffffffff81026b19>] ? kvm_deferred_mmu_op+0x52/0xe7
: [  454.006946]  [<ffffffff81026c03>] kvm_mmu_write+0x2e/0x35
: [  454.006949]  [<ffffffff81026c7d>] kvm_set_pte_at+0x19/0x1b
: [  454.006953]  [<ffffffff810aba67>] __do_fault+0x3c4/0x492
: [  454.006957]  [<ffffffff810adcf4>] handle_mm_fault+0x478/0x9d8
: [  454.006966]  [<ffffffff810deb59>] ? path_put+0x2c/0x30
: [  454.006975]  [<ffffffff8102f162>] do_page_fault+0x2f6/0x31a
: [  454.006979]  [<ffffffff8183b81e>] ? _raw_spin_lock+0x9/0xd
: [  454.006982]  [<ffffffff8183bef5>] page_fault+0x25/0x30
: [  454.006985] Mem-Info:
: [  454.006987] Node 0 DMA per-cpu:
: [  454.006990] CPU    0: hi:    0, btch:   1 usd:   0
: [  454.006992] CPU    1: hi:    0, btch:   1 usd:   0
: [  454.006993] Node 0 DMA32 per-cpu:
: [  454.006996] CPU    0: hi:  186, btch:  31 usd: 185
: [  454.006998] CPU    1: hi:  186, btch:  31 usd: 112
: [  454.007003] active_anon:8308 inactive_anon:8544 isolated_anon:0
: [  454.007005]  active_file:4882 inactive_file:205902 isolated_file:0
: [  454.007006]  unevictable:0 dirty:11 writeback:0 unstable:0
: [  454.007007]  free:1385 slab_reclaimable:2445 slab_unreclaimable:4466
: [  454.007008]  mapped:1895 shmem:113 pagetables:1370 bounce:0
: [  454.007010] Node 0 DMA free:4000kB min:60kB low:72kB high:88kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:11844kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15768kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:64kB slab_unreclaimable:32kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
: [  454.007021] lowmem_reserve[]: 0 994 994 994
: [  454.007025] Node 0 DMA32 free:1540kB min:4000kB low:5000kB high:6000kB active_anon:33232kB inactive_anon:34176kB active_file:19528kB inactive_file:811764kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:1018068kB mlocked:0kB dirty:44kB writeback:0kB mapped:7580kB shmem:452kB slab_reclaimable:9716kB slab_unreclaimable:17832kB kernel_stack:1144kB pagetables:5480kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
: [  454.007036] lowmem_reserve[]: 0 0 0 0
: [  454.007040] Node 0 DMA: 0*4kB 4*8kB 6*16kB 5*32kB 6*64kB 4*128kB 1*256kB 1*512kB 0*1024kB 1*2048kB 0*4096kB = 4000kB
: [  454.007050] Node 0 DMA32: 13*4kB 2*8kB 3*16kB 1*32kB 2*64kB 0*128kB 1*256kB 0*512kB 1*1024kB 0*2048kB 0*4096kB = 1556kB
: [  454.007059] 210914 total pagecache pages
: [  454.007061] 0 pages in swap cache
: [  454.007063] Swap cache stats: add 0, delete 0, find 0/0
: [  454.007065] Free swap  = 1959924kB
: [  454.007067] Total swap = 1959924kB
: [  454.014238] 262140 pages RAM
: [  454.014241] 7489 pages reserved
: [  454.014242] 21430 pages shared
: [  454.014244] 247174 pages non-shared

Either page reclaim got worse or kvm/virtio-net got more aggressive.  

Avi, Rusty: can you think of any changes in the KVM/virtio area in the
2.6.30 -> 2.6.32 timeframe which may have increased the GFP_ATOMIC
demands upon the page allocator?

Thanks.

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