(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@xxxxxxxxxxxxxxxxxxx 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@xxxxxxxxxxxxxxxxxxxx > ReportedBy: kernel@xxxxxxxxxxx > 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>