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Message-ID: <20130622114745.GB8075@amd.pavel.ucw.cz> Date: Sat, 22 Jun 2013 13:47:46 +0200 From: Pavel Machek <pavel@....cz> To: kernel list <linux-kernel@...r.kernel.org> Cc: linux-bcache@...r.kernel.org, koverstreet@...gle.com Subject: bcache: order 7 allocation Hi! I'm trying to play with bcache, but first surprise was oom in syslog: Order 7 alocation is pretty big, no? Pavel bcache: register_bdev() registered backing device sda4 bcache: register_bcache() error opening /dev/sdb1: Not a bcache superblock bash: page allocation failure: order:7, mode:0x80d0 CPU: 0 PID: 4091 Comm: bash Tainted: G W 3.10.0-rc6+ #266 Hardware name: LENOVO 17097HU/17097HU, BIOS 7BETD3WW (2.14 ) 10/04/2007 00000000 ebaabd5c c09597dc ebaabd8c c02a8550 c0b2b094 f4588950 00000007 000080d0 00000000 01000000 c0c7c580 00000001 00000001 00000000 ebaabe24 c02a9d36 000080d0 00000007 00000000 c0c7bbc0 00000000 00000001 ebaabe16 Call Trace: [<c09597dc>] dump_stack+0x16/0x18 [<c02a8550>] warn_alloc_failed+0xc0/0x100 [<c02a9d36>] __alloc_pages_nodemask+0x4d6/0x6f0 [<c02a9fc7>] __get_free_pages+0x17/0x30 [<c06e91c4>] register_cache+0x3e4/0x5d0 [<c02cff58>] ? cache_alloc_debugcheck_after+0x68/0x220 [<c02d18aa>] ? kmem_cache_alloc+0xfa/0x100 [<c06e985f>] ? register_bcache+0x4af/0xc10 [<c06e987b>] register_bcache+0x4cb/0xc10 [<c027c086>] ? __lock_acquire+0x386/0xcf0 [<c0329f63>] ? sysfs_write_file+0x83/0xf0 [<c06e93b0>] ? register_cache+0x5d0/0x5d0 [<c0445a10>] kobj_attr_store+0x20/0x30 [<c0329f79>] sysfs_write_file+0x99/0xf0 [<c02d6080>] vfs_write+0xb0/0x190 [<c0329ee0>] ? sysfs_open_file+0x1e0/0x1e0 [<c02d6251>] SyS_write+0x51/0x90 [<c095d7f8>] sysenter_do_call+0x12/0x31 Mem-Info: DMA per-cpu: CPU 0: hi: 0, btch: 1 usd: 0 CPU 1: hi: 0, btch: 1 usd: 0 Normal per-cpu: CPU 0: hi: 186, btch: 31 usd: 0 CPU 1: hi: 186, btch: 31 usd: 0 HighMem per-cpu: CPU 0: hi: 186, btch: 31 usd: 0 CPU 1: hi: 186, btch: 31 usd: 20 active_anon:91768 inactive_anon:47794 isolated_anon:0 active_file:48599 inactive_file:14374 isolated_file:0 unevictable:4 dirty:111 writeback:0 unstable:0 free:127541 slab_reclaimable:155598 slab_unreclaimable:22989 mapped:23527 shmem:24489 pagetables:1391 bounce:0 free_cma:0 DMA free:1580kB min:4kB low:4kB high:4kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:1580kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes lowmem_reserve[]: 0 850 2000 2000 Normal free:55600kB min:3724kB low:4652kB high:5584kB active_anon:14408kB inactive_anon:14416kB active_file:28384kB inactive_file:28344kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:892920kB managed:870564kB mlocked:0kB dirty:408kB writeback:0kB mapped:64kB shmem:17620kB slab_reclaimable:622392kB slab_unreclaimable:91956kB kernel_stack:2736kB pagetables:5564kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 9206 9206 HighMem free:452984kB min:512kB low:1772kB high:3032kB active_anon:352664kB inactive_anon:176844kB active_file:166012kB inactive_file:29152kB unevictable:16kB isolated(anon):0kB isolated(file):0kB present:1178440kB managed:1178440kB mlocked:16kB dirty:36kB writeback:0kB mapped:94044kB shmem:80336kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 DMA: 1*4kB (U) 1*8kB (U) 0*16kB 1*32kB (U) 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 0*2048kB 0*4096kB = 1580kB Normal: 12737*4kB (EM) 464*8kB (UEMR) 7*16kB (UMR) 1*32kB (R) 1*64kB (R) 2*128kB (R) 0*256kB 1*512kB (R) 0*1024kB 0*2048kB 0*4096kB = 55636kB HighMem: 20470*4kB (UEMR) 17082*8kB (UEMR) 8461*16kB (UEMR) 2331*32kB (UEMR) 325*64kB (UEMR) 22*128kB (UEMR) 3*256kB (UE) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 452888kB 87500 total pagecache pages 20 pages in swap cache Swap cache stats: add 863, delete 843, find 13/17 Free swap = 775840kB Total swap = 779148kB 521935 pages RAM 294610 pages HighMem 9299 pages reserved 747603 pages shared 322744 pages non-shared bcache: register_cache() error opening sdb1: cannot allocate memory bashged:1580kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_ -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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