From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with SMTP id 0787A600337 for ; Thu, 8 Apr 2010 15:40:50 -0400 (EDT) Message-ID: <4BBE30F6.30607@redhat.com> Date: Thu, 08 Apr 2010 22:39:34 +0300 From: Avi Kivity MIME-Version: 1.0 Subject: Re: [Bugme-new] [Bug 15709] New: swapper page allocation failure References: <20100408123438.1cadc5b6.akpm@linux-foundation.org> In-Reply-To: <20100408123438.1cadc5b6.akpm@linux-foundation.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Andrew Morton Cc: linux-mm@kvack.org, bugzilla-daemon@bugzilla.kernel.org, bugme-daemon@bugzilla.kernel.org, Rusty Russell , kernel@tauceti.net, Mel Gorman , "Michael S. Tsirkin" List-ID: 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@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] [] __alloc_pages_nodemask+0x5c8/0x615 > : [ 454.006796] [] ? ip_local_deliver+0x65/0x6d > : [ 454.006820] [] alloc_pages_current+0x96/0x9f > : [ 454.006842] [] try_fill_recv+0x5e/0x20f > : [ 454.006846] [] virtnet_poll+0x52a/0x5c7 > : [ 454.006858] [] ? run_timer_softirq+0x1dc/0x1f4 > : [ 454.006873] [] net_rx_action+0xad/0x1a5 > : [ 454.006882] [] __do_softirq+0x9c/0x127 > : [ 454.006897] [] call_softirq+0x1c/0x30 > : [ 454.006901] [] do_softirq+0x41/0x7e > : [ 454.006904] [] irq_exit+0x36/0x75 > : [ 454.006907] [] do_IRQ+0xaa/0xc1 > : [ 454.006926] [] ret_from_intr+0x0/0x11 > : [ 454.006928] [] ? kvm_deferred_mmu_op+0x5e/0xe7 > : [ 454.006942] [] ? kvm_deferred_mmu_op+0x52/0xe7 > : [ 454.006946] [] kvm_mmu_write+0x2e/0x35 > : [ 454.006949] [] kvm_set_pte_at+0x19/0x1b > : [ 454.006953] [] __do_fault+0x3c4/0x492 > : [ 454.006957] [] handle_mm_fault+0x478/0x9d8 > : [ 454.006966] [] ? path_put+0x2c/0x30 > : [ 454.006975] [] do_page_fault+0x2f6/0x31a > : [ 454.006979] [] ? _raw_spin_lock+0x9/0xd > : [ 454.006982] [] 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. > -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org