Swapper problems?
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When my Sheevaplug has been under load, I've been occasionally been
getting swapper page allocation failures (monster kernel log attached).
What's particularly worrying about this is that the system's got a
gigabyte of swap, and the log claims that it's all free. So why should
it be behaving as if it's running out of memory? Given that I want to
run Java on this machine, this could be an issue!
This problem is, in fact, strikingly similar to recurrent issue on
Debian on the NSLU2, where when the system was under heavy load the OOM
killer would erroneously start nuking processes at random, regardless of
the amount of available swap. Are there any known problems with the VM
on ARM?
I'm using:
Linux chur 2.6.30-rc8-kirkwood #1 Wed Jun 3 22:03:05 UTC 2009 armv5tel
GNU/Linux
The swap is a file on a JFS partition on a RAID0 volume on USB, if that
helps. I'm about to retry with 2.6.31-rc7 and see if that helps.
Aug 22 03:50:31 chur kernel: [25651.180000] swapper: page allocation
failure. order:1, mode:0x20
Aug 22 03:50:31 chur kernel: [25651.180000] [<c002bcec>]
(unwind_backtrace+0x0/0xd4) from [<c008d6c8>]
(__alloc_pages_internal+0x390/0x3ac)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c008d6c8>]
(__alloc_pages_internal+0x390/0x3ac) from [<c00a9764>]
(cache_alloc_refill+0x268/0x504)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c00a9764>]
(cache_alloc_refill+0x268/0x504) from [<c00a9b64>]
(kmem_cache_alloc+0x50/0xd8)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c00a9b64>]
(kmem_cache_alloc+0x50/0xd8) from [<c01ffd58>] (sk_prot_alloc+0x24/0xc0)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c01ffd58>]
(sk_prot_alloc+0x24/0xc0) from [<c02005a0>] (sk_clone+0x14/0x1c0)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c02005a0>]
(sk_clone+0x14/0x1c0) from [<c02388d0>] (inet_csk_clone+0x14/0x9c)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c02388d0>]
(inet_csk_clone+0x14/0x9c) from [<c024ccd0>]
(tcp_create_openreq_child+0x18/0x338)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c024ccd0>]
(tcp_create_openreq_child+0x18/0x338) from [<c024ad28>]
(tcp_v4_syn_recv_sock+0x4c/0x1c0)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c024ad28>]
(tcp_v4_syn_recv_sock+0x4c/0x1c0) from [<c024caec>]
(tcp_check_req+0x250/0x41c)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c024caec>]
(tcp_check_req+0x250/0x41c) from [<c024a4ac>] (tcp_v4_do_rcv+0x1cc/0x2f4)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c024a4ac>]
(tcp_v4_do_rcv+0x1cc/0x2f4) from [<c024c768>] (tcp_v4_rcv+0x750/0x7bc)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c024c768>]
(tcp_v4_rcv+0x750/0x7bc) from [<c022f650>]
(ip_local_deliver_finish+0x1a0/0x270)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c022f650>]
(ip_local_deliver_finish+0x1a0/0x270) from [<c022f490>]
(ip_rcv_finish+0x348/0x368)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c022f490>]
(ip_rcv_finish+0x348/0x368) from [<c020b69c>]
(netif_receive_skb+0x54c/0x5a0)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c020b69c>]
(netif_receive_skb+0x54c/0x5a0) from [<bf14e1c0>]
(mv643xx_eth_poll+0x44c/0x5c8 [mv643xx_eth])
Aug 22 03:50:31 chur kernel: [25651.180000] [<bf14e1c0>]
(mv643xx_eth_poll+0x44c/0x5c8 [mv643xx_eth]) from [<c020e214>]
(net_rx_action+0x98/0x194)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c020e214>]
(net_rx_action+0x98/0x194) from [<c0043538>] (__do_softirq+0x98/0x160)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c0043538>]
(__do_softirq+0x98/0x160) from [<c004381c>] (irq_exit+0x40/0x90)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c004381c>]
(irq_exit+0x40/0x90) from [<c0025054>] (_text+0x54/0x6c)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c0025054>]
(_text+0x54/0x6c) from [<c00259b4>] (__irq_svc+0x34/0x80)
Aug 22 03:50:31 chur kernel: [25651.180000] Exception stack(0xc0369f40
to 0xc0369f88)
Aug 22 03:50:31 chur kernel: [25651.180000] 9f40: 000d0d2d 000003e8
00000000 4a8f5cf6 c036dd28 c036dd28 c0022ee8 c036bde8
Aug 22 03:50:31 chur kernel: [25651.180000] 9f60: c036dd28 56251311
c03edc00 00000000 32fb787f c0369f88 c0059e54 c002fb9c
Aug 22 03:50:31 chur kernel: [25651.180000] 9f80: 20000013 ffffffff
Aug 22 03:50:31 chur kernel: [25651.180000] [<c00259b4>]
(__irq_svc+0x34/0x80) from [<c0059e54>] (do_gettimeofday+0x28/0x34)
Aug 22 03:50:31 chur kernel: [25651.180000] [<c0059e54>]
(do_gettimeofday+0x28/0x34) from [<000d0c4d>] (0xd0c4d)
Aug 22 03:50:31 chur kernel: [25651.180000] Mem-info:
Aug 22 03:50:31 chur kernel: [25651.180000] Normal per-cpu:
Aug 22 03:50:31 chur kernel: [25651.180000] CPU 0: hi: 186, btch:
31 usd: 167
Aug 22 03:50:31 chur kernel: [25651.180000] Active_anon:2135
active_file:43341 inactive_anon:5588
Aug 22 03:50:31 chur kernel: [25651.180000] inactive_file:36610
unevictable:0 dirty:17629 writeback:0 unstable:0
Aug 22 03:50:31 chur kernel: [25651.180000] free:904 slab:37848
mapped:2767 pagetables:182 bounce:0
Aug 22 03:50:31 chur kernel: [25651.180000] Normal free:3616kB
min:2884kB low:3604kB high:4324kB active_anon:8540kB
inactive_anon:22352kB active_file:173364kB inactive_file:146440kB
unevictable:0kB present:520192kB pages_scanned:0 all_unreclaimable? no
Aug 22 03:50:31 chur kernel: [25651.180000] lowmem_reserve[]: 0 0
Aug 22 03:50:31 chur kernel: [25651.180000] Normal: 870*4kB 1*8kB 2*16kB
1*32kB 1*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 3616kB
Aug 22 03:50:31 chur kernel: [25651.180000] 79978 total pagecache pages
Aug 22 03:50:31 chur kernel: [25651.180000] 0 pages in swap cache
Aug 22 03:50:31 chur kernel: [25651.180000] Swap cache stats: add 0,
delete 0, find 0/0
Aug 22 03:50:31 chur kernel: [25651.180000] Free swap = 1048568kB
Aug 22 03:50:31 chur kernel: [25651.180000] Total swap = 1048568kB
Aug 22 03:50:31 chur kernel: [25651.180000] 131072 pages of RAM
Aug 22 03:50:31 chur kernel: [25651.180000] 1285 free pages
Aug 22 03:50:31 chur kernel: [25651.180000] 2119 reserved pages
Aug 22 03:50:31 chur kernel: [25651.180000] 37848 slab pages
Aug 22 03:50:31 chur kernel: [25651.180000] 53987 pages shared
Aug 22 03:50:31 chur kernel: [25651.180000] 0 pages swap cached
- --
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