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[Bug 491943] [NEW] Kernel trace buffer should be set to less unrealistic value

To: registry@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <491943@xxxxxxxxxxxxxxxxxx>
Date: Tue, 24 Aug 2010 19:55:23 -0000
Reply-to: Bug 491943 <491943@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
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When ureadahead tries to profile on a system with 512MB of memory.  The kernel gets an OOM error.
Below is the kernel stack dump.

[    2.912175] Freeing unused kernel memory: 336k freed
[    2.912713] Write protecting the kernel text: 4536k
[    2.913052] Write protecting the kernel read-only data: 2004k
[    4.335798] ureadahead invoked oom-killer: gfp_mask=0xd0, order=0, oomkilladj=0
[    4.335820] Pid: 64, comm: ureadahead Not tainted 2.6.31-15-generic #50fastboot9-Ubuntu
[    4.335832] Call Trace:
[    4.335859]  [<c1077c61>] T.393+0x61/0x1be
[    4.335879]  [<c1077ded>] __out_of_memory+0x2f/0x113
[    4.335896]  [<c1077f2f>] out_of_memory+0x5e/0x86
[    4.335914]  [<c107a20f>] __alloc_pages_nodemask+0x36a/0x42f
[    4.335933]  [<c107a309>] __get_free_pages+0xf/0x21
[    4.335951]  [<c106227b>] ring_buffer_resize+0x139/0x238
[    4.335970]  [<c1062c03>] tracing_resize_ring_buffer+0x2f/0x70
[    4.335987]  [<c1065ba2>] tracing_entries_write+0xb2/0x136
[    4.336005]  [<c10651d3>] ? trace_nowake_buffer_unlock_commit+0x3f/0x46
[    4.336051]  [<c10982a6>] ? ftrace_raw_event_do_sys_open+0x85/0x8d
[    4.336069]  [<c109a599>] vfs_write+0x8a/0x112
[    4.336086]  [<c1065af0>] ? tracing_entries_write+0x0/0x136
[    4.336103]  [<c109a6b8>] sys_write+0x3b/0x60
[    4.336121]  [<c1002af4>] sysenter_do_call+0x12/0x26
[    4.336132] Mem-Info:
[    4.336140] DMA per-cpu:
[    4.336150] CPU    0: hi:    0, btch:   1 usd:   0
[    4.336161] CPU    1: hi:    0, btch:   1 usd:   0
[    4.336170] Normal per-cpu:
[    4.336181] CPU    0: hi:  186, btch:  31 usd: 156
[    4.336192] CPU    1: hi:  186, btch:  31 usd: 161
[    4.336212] Active_anon:326 active_file:13 inactive_anon:352
[    4.336218]  inactive_file:4 unevictable:0 dirty:6 writeback:0 unstable:0
[    4.336224]  free:1176 slab:3013 mapped:0 pagetables:3 bounce:0
[    4.336245] DMA free:2000kB min:88kB low:108kB high:132kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB present:15836kB pages_scanned:0 all_unreclaimable? yes
[    4.336270] lowmem_reserve[]: 0 482 482 482
[    4.336312] Normal free:2704kB min:2760kB low:3448kB high:4140kB active_anon:1304kB inactive_anon:1408kB active_file:52kB inactive_file:16kB unevictable:0kB present:493624kB pages_scanned:0 all_unreclaimable? no
[    4.336338] lowmem_reserve[]: 0 0 0 0
[    4.336362] DMA: 0*4kB 0*8kB 1*16kB 0*32kB 1*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2000kB
[    4.336414] Normal: 0*4kB 0*8kB 1*16kB 0*32kB 0*64kB 1*128kB 0*256kB 1*512kB 0*1024kB 1*2048kB 0*4096kB = 2704kB
[    4.336464] 644 total pagecache pages
[    4.336473] 0 pages in swap cache
[    4.336482] Swap cache stats: add 0, delete 0, find 0/0
[    4.336491] Free swap  = 0kB
[    4.336499] Total swap = 0kB
[    4.344121] 128720 pages RAM
[    4.344132] 0 pages HighMem
[    4.344140] 3428 pages reserved
[    4.344148] 630 pages shared
[    4.344155] 122976 pages non-shared
[    4.344169] Out of memory: kill process 64 (ureadahead) score 33 or a child
[    4.344199] Killed process 64 (ureadahead)
[    4.344353] ureadahead: page allocation failure. order:0, mode:0xd0
[    4.344372] Pid: 64, comm: ureadahead Not tainted 2.6.31-15-generic #50fastboot9-Ubuntu
[    4.344382] Call Trace:
[    4.344407]  [<c146ac77>] ? printk+0xf/0x11
[    4.344429]  [<c107a292>] __alloc_pages_nodemask+0x3ed/0x42f
[    4.344449]  [<c107a309>] __get_free_pages+0xf/0x21
[    4.344468]  [<c106227b>] ring_buffer_resize+0x139/0x238
[    4.344486]  [<c1062c03>] tracing_resize_ring_buffer+0x2f/0x70
[    4.344503]  [<c1065ba2>] tracing_entries_write+0xb2/0x136
[    4.344521]  [<c10651d3>] ? trace_nowake_buffer_unlock_commit+0x3f/0x46
[    4.344541]  [<c10982a6>] ? ftrace_raw_event_do_sys_open+0x85/0x8d
[    4.344559]  [<c109a599>] vfs_write+0x8a/0x112
[    4.344575]  [<c1065af0>] ? tracing_entries_write+0x0/0x136
[    4.344592]  [<c109a6b8>] sys_write+0x3b/0x60
[    4.344610]  [<c1002af4>] sysenter_do_call+0x12/0x26
[    4.344621] Mem-Info:
[    4.344629] DMA per-cpu:
[    4.344638] CPU    0: hi:    0, btch:   1 usd:   0
[    4.344649] CPU    1: hi:    0, btch:   1 usd:   0
[    4.344658] Normal per-cpu:
[    4.344669] CPU    0: hi:  186, btch:  31 usd: 156
[    4.344689] CPU    1: hi:  186, btch:  31 usd: 161
[    4.344700] Active_anon:326 active_file:13 inactive_anon:352
[    4.344703]  inactive_file:4 unevictable:0 dirty:6 writeback:0 unstable:0
[    4.344706]  free:1176 slab:3013 mapped:0 pagetables:3 bounce:0
[    4.344717] DMA free:2000kB min:88kB low:108kB high:132kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB present:15836kB pages_scanned:0 all_unreclaimable? yes
[    4.344725] lowmem_reserve[]: 0 482 482 482
[    4.344740] Normal free:2704kB min:2760kB low:3448kB high:4140kB active_anon:1304kB inactive_anon:1408kB active_file:52kB inactive_file:16kB unevictable:0kB present:493624kB pages_scanned:0 all_unreclaimable? no
[    4.344748] lowmem_reserve[]: 0 0 0 0
[    4.344758] DMA: 0*4kB 0*8kB 1*16kB 0*32kB 1*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 2000kB
[    4.344783] Normal: 0*4kB 0*8kB 1*16kB 0*32kB 0*64kB 1*128kB 0*256kB 1*512kB 0*1024kB 1*2048kB 0*4096kB = 2704kB
[    4.344808] 644 total pagecache pages
[    4.344813] 0 pages in swap cache
[    4.344818] Swap cache stats: add 0, delete 0, find 0/0
[    4.344822] Free swap  = 0kB
[    4.344826] Total swap = 0kB
[    4.348583] 128720 pages RAM
[    4.348588] 0 pages HighMem
[    4.348592] 3428 pages reserved
[    4.348596] 630 pages shared
[    4.348600] 122976 pages non-shared
[    4.982732] wl: module license 'MIXED/Proprietary' taints kernel.
[    4.982744] Disabling lock debugging due to kernel taint
[    4.990532] wl 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[    4.990555] wl 0000:03:00.0: setting latency timer to 64
[    5.427550] ACPI: Battery Slot [BAT1] (battery present)
[    5.617895] compal-laptop: Identified laptop model 'Dell Mini 10v'.
[    5.618487] compal-laptop: driver 0.2.6 successfully loaded.
[    5.629208] lib80211_crypt: registered algorithm 'TKIP'

** Affects: null
     Importance: High
     Assignee: Bryan Wu (cooloney)
         Status: In Progress

** Affects: ureadahead
     Importance: High
         Status: Invalid

** Affects: ureadahead (Ubuntu)
     Importance: High
     Assignee: Tim Gardner (timg-tpi)
         Status: Fix Released

** Affects: ureadahead (Ubuntu Lucid)
     Importance: High
     Assignee: Tim Gardner (timg-tpi)
         Status: In Progress


** Tags: patch
-- 
Kernel trace buffer should be set to less unrealistic value
https://bugs.edge.launchpad.net/bugs/491943
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