I'm not really a git hero so here is what I've done: cd /usr/src git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git linux cd linux git checkout -b mykernel 0b4f2928f14c4a9770b0866923fc81beb7f4aa57 Then I've checked drivers/net/virtio_net.c drivers/net/smc91x.c if the changes commited where not in there. Next I build my kernel as usual. I used my .config from 2.6.30 (which is working fine in a several guests / .config see here: https://bugzilla.kernel.org/attachment.cgi?id=25925) and build the kernel genkernel --menuconfig --lvm --oldconfig all which finally gave me a 2.6.31-rc5. I should mention that 2.6.30 was using SLUB. So here is the output from the 2.6.31-rc5 kernel running about 20 min.: https://bugzilla.kernel.org/attachment.cgi?id=25926 Seems not very usefull to me. I'm currently compiling the same kernel with SLAB. Please let me know if the git commands above are right and/or if you need other kernel options enabled. Thanks! Robert On 04/08/10 22:04, Michael S. Tsirkin wrote: > 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? > > -- 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/ . 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