On Thu, Apr 08, 2010 at 10:39:34PM +0300, Avi Kivity wrote: > cc: mst > > On 04/08/2010 10:34 PM, Andrew Morton wrote: >> (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. >> On the contrary, with commit 3161e453e496eb5643faad30fff5a5ab183da0fe we should be using GFP_ATOMIC less. But maybe there's a bug and it has the reverse effect somehow ... Robert, could you pls try 3161e453e496eb5643faad30fff5a5ab183da0fe and if that *does* have the problem, 0b4f2928f14c4a9770b0866923fc81beb7f4aa57? -- MST -- 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>