我正在运行一个带有 i2p 和 tor 的 ARM 路由器 - Netgear R7000。当然，我为其添加了整整 512 MB 的 SWAP 以防止 OOM，我知道这可能会降低系统速度……但我仍然得到 OOM 杀手，从大量 SWAP 可用开始，并杀死 tor！更有趣的是，在杀死 tor 之后，系统似乎可以无限期地正常运行……但似乎仍然无法交换 tor。我甚至尝试关闭过度使用，但根本没有帮助。
参见下面的 dmesg 日志
resetbutton invoked oom-killer: gfp_mask=0x2000d0, order=0, oom_score_adj=0
CPU: 0 PID: 1500 Comm: resetbutton Tainted: P 3.10.79 #381
Backtrace:
[<c0015cb8>] (dump_backtrace+0x0/0x118) from [<c0015ec0>] (show_stack+0x18/0x1c)
r6:c7a4cdc0 r5:00000000 r4:c6818000 r3:00000000
[<c0015ea8>] (show_stack+0x0/0x1c) from [<c012e5c0>] (dump_stack+0x24/0x28)
[<c012e59c>] (dump_stack+0x0/0x28) from [<c007c5cc>] (dump_header.isra.13+0x84/0x194)
[<c007c548>] (dump_header.isra.13+0x0/0x194) from [<c007c958>] (oom_kill_process+0x90/0x3e8)
[<c007c8c8>] (oom_kill_process+0x0/0x3e8) from [<c007d17c>] (out_of_memory+0x2c0/0x304)
[<c007cebc>] (out_of_memory+0x0/0x304) from [<c007fcbc>] (__alloc_pages_nodemask+0x5b0/0x694)
[<c007f70c>] (__alloc_pages_nodemask+0x0/0x694) from [<c00a2464>] (cache_alloc_refill+0x2c8/0x600)
[<c00a219c>] (cache_alloc_refill+0x0/0x600) from [<c00a214c>] (kmem_cache_alloc+0x88/0xd8)
[<c00a20c4>] (kmem_cache_alloc+0x0/0xd8) from [<c00afdd4>] (getname_flags+0x2c/0x104)
r7:b6f5509c r6:00000000 r5:00000000 r4:00020000
[<c00afda8>] (getname_flags+0x0/0x104) from [<c00afec4>] (getname+0x18/0x1c)
[<c00afeac>] (getname+0x0/0x1c) from [<c00a5270>] (do_sys_open+0xbc/0x178)
[<c00a51b4>] (do_sys_open+0x0/0x178) from [<c00a5350>] (SyS_open+0x24/0x28)
r9:c6818000 r8:c0008d24 r7:00000005 r6:00000000 r5:00000000
r4:00000000
[<c00a532c>] (SyS_open+0x0/0x28) from [<c0008ba0>] (ret_fast_syscall+0x0/0x30)
Mem-info:
Normal per-cpu:
CPU 0: hi: 42, btch: 7 usd: 0
CPU 1: hi: 42, btch: 7 usd: 0
HighMem per-cpu:
CPU 0: hi: 42, btch: 7 usd: 0
CPU 1: hi: 42, btch: 7 usd: 0
active_anon:10263 inactive_anon:12797 isolated_anon:0
active_file:957 inactive_file:1335 isolated_file:0
unevictable:151 dirty:0 writeback:0 unstable:0
free:13787 slab_reclaimable:912 slab_unreclaimable:5734
mapped:1171 shmem:0 pagetables:283 bounce:0
free_cma:0
Normal free:26184kB min:32768kB low:40960kB high:49152kB active_anon:0kB inactive_anon:0kB active_file:96kB inactive_file:64kB unevictable:64kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:124196kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:3648kB slab_unreclaimable:22936kB kernel_stack:1192kB pagetables:1132kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:4440 all_unreclaimable? no
lowmem_reserve[]: 0 1024 1024
HighMem free:28656kB min:128kB low:8772kB high:17416kB active_anon:41052kB inactive_anon:51512kB active_file:3764kB inactive_file:5244kB unevictable:540kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:131072kB mlocked:0kB dirty:0kB writeback:0kB mapped:4684kB 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? no
lowmem_reserve[]: 0 0 0
Normal: 102*4kB (UEM) 118*8kB (UEM) 360*16kB (UM) 158*32kB (UM) 28*64kB (UEM) 8*128kB (UM) 4*256kB (UM) 4*512kB (UM) 0*1024kB 0*2048kB 2*4096kB (R) = 26248kB
HighMem: 1177*4kB (UMR) 1620*8kB (UMR) 225*16kB (UMR) 30*32kB (UMR) 29*64kB (UMR) 8*128kB (UMR) 1*256kB (U) 2*512kB (U) 0*1024kB 1*2048kB (U) 0*4096kB = 28436kB
9347 total pagecache pages
6914 pages in swap cache
Swap cache stats: add 484419, delete 477505, find 187469/228822
Free swap = 408788kB
Total swap = 524284kB
65536 pages of RAM
13904 free pages
1661 reserved pages
6646 slab pages
549590 pages shared
6923 pages swap cached
[ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name
[ 622] 0 622 189 7 3 13 0 hotplug2
[ 626] 0 626 199 30 3 6 0 mstpd
[ 971] 0 971 217 9 3 8 0 dropbear
[ 987] 0 987 297 105 3 30 0 dnsmasq
[ 1112] 0 1112 315 29 4 30 0 ttraff
[ 1195] 0 1195 209 25 3 6 0 dhcp6c
[ 1288] 0 1288 755 3 4 83 0 httpd
[ 1330] 0 1330 315 26 3 18 0 process_monitor
[ 1334] 0 1334 361 44 3 38 0 upnp
[ 1337] 0 1337 334 50 4 9 0 wland
[ 1338] 0 1338 190 42 3 3 0 igmprt
[ 1339] 0 1339 291 10 3 6 0 udhcpc
[ 1449] 0 1449 182 27 3 3 0 cron
[ 1457] 0 1457 370 38 3 32 0 nas
[ 1460] 0 1460 370 36 4 32 0 nas
[ 1495] 0 1495 291 11 3 6 0 syslogd
[ 1497] 0 1497 291 15 3 6 0 klogd
[ 1500] 0 1500 334 32 3 12 0 resetbutton
[ 1684] 65534 1684 1008 18 5 499 0 tinyproxy
[ 1690] 65534 1690 1021 9 5 508 0 tinyproxy
[ 1691] 65534 1691 1021 9 5 508 0 tinyproxy
[ 1692] 65534 1692 1021 9 5 508 0 tinyproxy
[ 1693] 65534 1693 1008 6 5 502 0 tinyproxy
[ 1694] 65534 1694 1008 6 5 502 0 tinyproxy
[ 1695] 65534 1695 1008 6 5 502 0 tinyproxy
[ 1696] 65534 1696 1008 6 5 502 0 tinyproxy
[ 1697] 65534 1697 1008 6 5 502 0 tinyproxy
[ 1698] 65534 1698 1008 6 5 502 0 tinyproxy
[ 1699] 65534 1699 1008 6 5 502 0 tinyproxy
[ 1711] 106 1711 36556 12756 73 10236 0 tor
[ 1730] 13 1730 580 9 4 38 0 polipo
[ 1806] 1000 1806 2828 41 5 124 0 wrapper
[ 1808] 1000 1808 59927 7979 69 13797 0 java
[ 1921] 0 1921 241 18 3 31 0 dropbear
[ 1923] 0 1923 293 9 3 9 0 sh
[ 3705] 0 3705 804 5 4 86 0 bash
[ 5859] 0 5859 320 61 3 12 0 radvd
[ 5860] 0 5860 320 18 3 18 0 radvd
Out of memory: Kill process 1711 (tor) score 118 or sacrifice child
Killed process 1711 (tor) total-vm:146224kB, anon-rss:49036kB, file-rss:1988kB
tor: page allocation failure: order:0, mode:0x20058
CPU: 1 PID: 1711 Comm: tor Tainted: P 3.10.79 #381
Backtrace:
[<c0015cb8>] (dump_backtrace+0x0/0x118) from [<c0015ec0>] (show_stack+0x18/0x1c)
r6:00000000 r5:00000000 r4:00020058 r3:00000000
[<c0015ea8>] (show_stack+0x0/0x1c) from [<c012e5c0>] (dump_stack+0x24/0x28)
[<c012e59c>] (dump_stack+0x0/0x28) from [<c007def4>] (warn_alloc_failed+0x100/0x110)
[<c007ddf4>] (warn_alloc_failed+0x0/0x110) from [<c007faf0>] (__alloc_pages_nodemask+0x3e4/0x694)
r3:00040001 r2:00000000
r7:c0405180 r6:00000001 r5:00000000 r4:00020058
[<c007f70c>] (__alloc_pages_nodemask+0x0/0x694) from [<c007a274>] (find_or_create_page+0x48/0x94)
[<c007a22c>] (find_or_create_page+0x0/0x94) from [<c00cfc08>] (__getblk+0x16c/0x308)
r9:00000000 r8:0223764c r7:c7418110 r6:00000001 r5:00001000
r4:00000000
[<c00cfa9c>] (__getblk+0x0/0x308) from [<c00d0668>] (__bread+0x1c/0xd8)
[<c00d064c>] (__bread+0x0/0xd8) from [<bf5e96c8>] (_8+0x208/0x4a0 [ext2])
r4:c6bb5b58
[<bf5e963c>] (_8+0x17c/0x4a0 [ext2]) from [<bf5ea2e0>] (_35+0x78/0x884 [ext2])
[<bf5ea268>] (_35+0x0/0x884 [ext2]) from [<c00d6da8>] (do_mpage_readpage+0x268/0x6d4)
[<c00d6b40>] (do_mpage_readpage+0x0/0x6d4) from [<c00d72d4>] (mpage_readpages+0xc0/0x104)
[<c00d7214>] (mpage_readpages+0x0/0x104) from [<bf5e99ac>] (_61+0x24/0x28 [ext2])
[<bf5e9988>] (_61+0x0/0x28 [ext2]) from [<c0082f08>] (__do_page_cache_readahead+0x170/0x1f8)
[<c0082d98>] (__do_page_cache_readahead+0x0/0x1f8) from [<c0083428>] (ra_submit+0x30/0x38)
[<c00833f8>] (ra_submit+0x0/0x38) from [<c007bb4c>] (filemap_fault+0x1bc/0x434)
[<c007b990>] (filemap_fault+0x0/0x434) from [<c008e5a4>] (__do_fault+0xac/0x490)
[<c008e4f8>] (__do_fault+0x0/0x490) from [<c0091284>] (handle_pte_fault+0x78/0x6d4)
[<c009120c>] (handle_pte_fault+0x0/0x6d4) from [<c0091968>] (__handle_mm_fault+0x88/0x90)
[<c00918e0>] (__handle_mm_fault+0x0/0x90) from [<c00920e0>] (handle_mm_fault+0x28/0x2c)
[<c00920b8>] (handle_mm_fault+0x0/0x2c) from [<c001948c>] (do_page_fault+0x118/0x288)
[<c0019374>] (do_page_fault+0x0/0x288) from [<c0008580>] (do_DataAbort+0x40/0x9c)
[<c0008540>] (do_DataAbort+0x0/0x9c) from [<c0008998>] (__dabt_usr+0x38/0x40)
Exception stack(0xc6bb5fb0 to 0xc6bb5ff8)
5fa0: b6fe43d8 b6cfd864 00000005 00000053
5fc0: 00000001 b6fe43dd b6d0a358 b6cfd864 b866141c 00000000 b6fe43d8 00000000
5fe0: b6d0b658 be8798f0 b6cf2330 b6a4c388 20000010 ffffffff
r8:b866141c r7:b6cfd864 r6:ffffffff r5:20000010 r4:b6a4c388
Mem-info:
Normal per-cpu:
CPU 0: hi: 42, btch: 7 usd: 0
CPU 1: hi: 42, btch: 7 usd: 0
HighMem per-cpu:
CPU 0: hi: 42, btch: 7 usd: 0
CPU 1: hi: 42, btch: 7 usd: 0
active_anon:10263 inactive_anon:13171 isolated_anon:0
active_file:971 inactive_file:1322 isolated_file:0
unevictable:151 dirty:1 writeback:0 unstable:0
free:13621 slab_reclaimable:912 slab_unreclaimable:5739
mapped:1172 shmem:0 pagetables:283 bounce:0
free_cma:0
Normal free:27136kB min:32768kB low:40960kB high:49152kB active_anon:0kB inactive_anon:0kB active_file:40kB inactive_file:120kB unevictable:64kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:124196kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:3648kB slab_unreclaimable:22956kB kernel_stack:1192kB pagetables:1132kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:40 all_unreclaimable? no
lowmem_reserve[]: 0 1024 1024
HighMem free:27380kB min:128kB low:8772kB high:17416kB active_anon:41052kB inactive_anon:52684kB active_file:3764kB inactive_file:5248kB unevictable:540kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:131072kB mlocked:0kB dirty:4kB writeback:0kB mapped:4688kB 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? no
lowmem_reserve[]: 0 0 0
Normal: 96*4kB (UEM) 120*8kB (UEM) 360*16kB (UM) 182*32kB (UM) 32*64kB (UEM) 8*128kB (UM) 4*256kB (UM) 4*512kB (UM) 0*1024kB 0*2048kB 2*4096kB (R) = 27264kB
HighMem: 918*4kB (UMR) 1620*8kB (UMR) 225*16kB (UMR) 30*32kB (UMR) 29*64kB (UMR) 8*128kB (UMR) 1*256kB (U) 2*512kB (U) 0*1024kB 1*2048kB (U) 0*4096kB = 27400kB
9533 total pagecache pages
7099 pages in swap cache
Swap cache stats: add 484625, delete 477526, find 187576/228974
Free swap = 408868kB
Total swap = 524284kB
65536 pages of RAM
13939 free pages
1661 reserved pages
6652 slab pages
549523 pages shared
7099 pages swap cached
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
sysctl vm相关设置：
vm.admin_reserve_kbytes = 7914
vm.block_dump = 0
vm.dirty_background_bytes = 0
vm.dirty_background_ratio = 10
vm.dirty_bytes = 0
vm.dirty_expire_centisecs = 3000
vm.dirty_ratio = 20
vm.dirty_writeback_centisecs = 500
vm.drop_caches = 0
vm.highmem_is_dirtyable = 0
vm.laptop_mode = 0
vm.legacy_va_layout = 0
vm.lowmem_reserve_ratio = 32 32
vm.max_map_count = 65530
vm.min_free_kbytes = 32768
vm.mmap_min_addr = 4096
vm.nr_pdflush_threads = 0
vm.oom_dump_tasks = 1
vm.oom_kill_allocating_task = 0
vm.overcommit_memory = 2
vm.overcommit_ratio = 50
vm.page-cluster = 3
vm.panic_on_oom = 0
vm.percpu_pagelist_fraction = 0
vm.scan_unevictable_pages = 0
vm.stat_interval = 1
vm.swappiness = 100
vm.user_reserve_kbytes = 7914
vm.vfs_cache_pressure = 100
我做错了什么（除了使用 SOHO 路由器进行 tor，哈哈）？
PS：使用 DD-WRT 固件
编辑：另一个 OOM 杀手日志 - 这次没有关于 resetbutton 的内容：
kthreadd invoked oom-killer: gfp_mask=0x3000d0, order=1, oom_score_adj=0
CPU: 0 PID: 2 Comm: kthreadd Tainted: P 3.10.79 #381
Backtrace:
[<c0015cb8>] (dump_backtrace+0x0/0x118) from [<c0015ec0>] (show_stack+0x18/0x1c)
r6:c782fb80 r5:00000000 r4:c7834000 r3:00000000
[<c0015ea8>] (show_stack+0x0/0x1c) from [<c012e5c0>] (dump_stack+0x24/0x28)
[<c012e59c>] (dump_stack+0x0/0x28) from [<c007c5cc>] (dump_header.isra.13+0x84/0x194)
[<c007c548>] (dump_header.isra.13+0x0/0x194) from [<c007c958>] (oom_kill_process+0x90/0x3e8)
[<c007c8c8>] (oom_kill_process+0x0/0x3e8) from [<c007d17c>] (out_of_memory+0x2c0/0x304)
[<c007cebc>] (out_of_memory+0x0/0x304) from [<c007fcbc>] (__alloc_pages_nodemask+0x5b0/0x694)
[<c007f70c>] (__alloc_pages_nodemask+0x0/0x694) from [<c002bf70>] (copy_process.part.68+0xdc/0xe30)
[<c002be94>] (copy_process.part.68+0x0/0xe30) from [<c002cdd8>] (do_fork+0xe0/0x2bc)
[<c002ccf8>] (do_fork+0x0/0x2bc) from [<c002cfe4>] (kernel_thread+0x30/0x38)
r9:00000001 r8:00000000 r7:c7834000 r6:c0454014 r5:c04096a8
r4:c1109e88
[<c002cfb4>] (kernel_thread+0x0/0x38) from [<c004be50>] (kthreadd+0xe4/0x12c)
[<c004bd6c>] (kthreadd+0x0/0x12c) from [<c0008c38>] (ret_from_fork+0x14/0x3c)
Mem-info:
Normal per-cpu:
CPU 0: hi: 42, btch: 7 usd: 0
CPU 1: hi: 42, btch: 7 usd: 0
HighMem per-cpu:
CPU 0: hi: 42, btch: 7 usd: 0
CPU 1: hi: 42, btch: 7 usd: 0
active_anon:7196 inactive_anon:7223 isolated_anon:0
active_file:1054 inactive_file:1422 isolated_file:0
unevictable:199 dirty:3 writeback:0 unstable:0
free:22911 slab_reclaimable:969 slab_unreclaimable:6549
mapped:685 shmem:0 pagetables:210 bounce:0
free_cma:0
Normal free:29372kB min:32768kB low:40960kB high:49152kB active_anon:0kB inactive_anon:0kB active_file:44kB inactive_file:128kB unevictable:44kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:124196kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:3876kB slab_unreclaimable:26196kB kernel_stack:576kB pagetables:840kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:1064 all_unreclaimable? no
lowmem_reserve[]: 0 1024 1024
HighMem free:62272kB min:128kB low:8772kB high:17416kB active_anon:28784kB inactive_anon:28892kB active_file:4068kB inactive_file:5676kB unevictable:752kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:131072kB mlocked:0kB dirty:12kB writeback:0kB mapped:2740kB 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? no
lowmem_reserve[]: 0 0 0
Normal: 465*4kB (UEM) 285*8kB (UEM) 219*16kB (UEM) 92*32kB (UEM) 51*64kB (UEM) 25*128kB (UEM) 12*256kB (UEM) 2*512kB (U) 0*1024kB 0*2048kB 2*4096kB (R) = 29340kB
HighMem: 5997*4kB (UM) 2743*8kB (UM) 478*16kB (UM) 27*32kB (UM) 2*64kB (M) 2*128kB (U) 1*256kB (U) 2*512kB (U) 0*1024kB 1*2048kB (U) 1*4096kB (R) = 62252kB
5489 total pagecache pages
2805 pages in swap cache
Swap cache stats: add 1237151, delete 1234346, find 539424/688368
Free swap = 484712kB
Total swap = 524284kB
65536 pages of RAM
23095 free pages
1661 reserved pages
7517 slab pages
557492 pages shared
2805 pages swap cached
[ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name
[ 622] 0 622 189 1 3 12 0 hotplug2
[ 626] 0 626 199 31 3 6 0 mstpd
[ 971] 0 971 217 1 3 7 0 dropbear
[ 987] 0 987 297 105 3 30 0 dnsmasq
[ 1112] 0 1112 315 61 4 10 0 ttraff
[ 1195] 0 1195 209 40 3 2 0 dhcp6c
[ 1288] 0 1288 755 1 4 82 0 httpd
[ 1330] 0 1330 315 38 3 17 0 process_monitor
[ 1334] 0 1334 366 89 3 11 0 upnp
[ 1337] 0 1337 334 50 4 9 0 wland
[ 1338] 0 1338 190 45 3 4 0 igmprt
[ 1339] 0 1339 291 30 3 5 0 udhcpc
[ 1449] 0 1449 182 32 3 2 0 cron
[ 1457] 0 1457 370 36 3 32 0 nas
[ 1460] 0 1460 370 34 4 32 0 nas
[ 1495] 0 1495 291 20 3 5 0 syslogd
[ 1497] 0 1497 291 37 3 2 0 klogd
[ 1500] 0 1500 334 32 3 12 0 resetbutton
[ 1684] 65534 1684 1008 15 5 499 0 tinyproxy
[ 1690] 65534 1690 1021 5 5 507 0 tinyproxy
[ 1691] 65534 1691 1021 5 5 507 0 tinyproxy
[ 1692] 65534 1692 1021 5 5 507 0 tinyproxy
[ 1693] 65534 1693 1008 4 5 501 0 tinyproxy
[ 1694] 65534 1694 1008 4 5 501 0 tinyproxy
[ 1695] 65534 1695 1008 4 5 501 0 tinyproxy
[ 1696] 65534 1696 1008 4 5 501 0 tinyproxy
[ 1697] 65534 1697 1008 4 5 501 0 tinyproxy
[ 1698] 65534 1698 1008 4 5 501 0 tinyproxy
[ 1699] 65534 1699 1008 4 5 501 0 tinyproxy
[ 1730] 13 1730 580 10 4 37 0 polipo
[ 1806] 1000 1806 2828 78 5 116 0 wrapper
[ 1921] 0 1921 241 51 3 19 0 dropbear
[ 1923] 0 1923 293 1 3 8 0 sh
[16658] 106 16643 33786 12722 65 7647 0 tor
[16661] 0 16661 804 4 4 85 0 bash
[17143] 0 17143 790 167 4 26 0 top
[20851] 0 20851 320 64 3 12 0 radvd
[20853] 0 20853 320 33 3 17 0 radvd
Out of memory: Kill process 16658 (tor) score 104 or sacrifice child
Killed process 16658 (tor) total-vm:135144kB, anon-rss:49088kB, file-rss:1800kB
tor: page allocation failure: order:0, mode:0x20058
CPU: 1 PID: 16658 Comm: tor Tainted: P 3.10.79 #381
Backtrace:
[<c0015cb8>] (dump_backtrace+0x0/0x118) from [<c0015ec0>] (show_stack+0x18/0x1c)
r6:00000000 r5:00000000 r4:00020058 r3:00000000
[<c0015ea8>] (show_stack+0x0/0x1c) from [<c012e5c0>] (dump_stack+0x24/0x28)
[<c012e59c>] (dump_stack+0x0/0x28) from [<c007def4>] (warn_alloc_failed+0x100/0x110)
[<c007ddf4>] (warn_alloc_failed+0x0/0x110) from [<c007faf0>] (__alloc_pages_nodemask+0x3e4/0x694)
r3:00040001 r2:00000000
r7:c0405180 r6:c6488000 r5:00000000 r4:00020058
[<c007f70c>] (__alloc_pages_nodemask+0x0/0x694) from [<c007a274>] (find_or_create_page+0x48/0x94)
[<c007a22c>] (find_or_create_page+0x0/0x94) from [<c00cfc08>] (__getblk+0x16c/0x308)
r9:00000000 r8:0220f844 r7:c7418110 r6:00000001 r5:00001000
r4:00000000
[<c00cfa9c>] (__getblk+0x0/0x308) from [<c00d0668>] (__bread+0x1c/0xd8)
[<c00d064c>] (__bread+0x0/0xd8) from [<bf5e96c8>] (_8+0x208/0x4a0 [ext2])
r4:c6489b58
[<bf5e963c>] (_8+0x17c/0x4a0 [ext2]) from [<bf5ea2e0>] (_35+0x78/0x884 [ext2])
[<bf5ea268>] (_35+0x0/0x884 [ext2]) from [<c00d6da8>] (do_mpage_readpage+0x268/0x6d4)
[<c00d6b40>] (do_mpage_readpage+0x0/0x6d4) from [<c00d72d4>] (mpage_readpages+0xc0/0x104)
[<c00d7214>] (mpage_readpages+0x0/0x104) from [<bf5e99ac>] (_61+0x24/0x28 [ext2])
[<bf5e9988>] (_61+0x0/0x28 [ext2]) from [<c0082f08>] (__do_page_cache_readahead+0x170/0x1f8)
[<c0082d98>] (__do_page_cache_readahead+0x0/0x1f8) from [<c0083428>] (ra_submit+0x30/0x38)
[<c00833f8>] (ra_submit+0x0/0x38) from [<c007bb4c>] (filemap_fault+0x1bc/0x434)
[<c007b990>] (filemap_fault+0x0/0x434) from [<c008e5a4>] (__do_fault+0xac/0x490)
[<c008e4f8>] (__do_fault+0x0/0x490) from [<c0091284>] (handle_pte_fault+0x78/0x6d4)
[<c009120c>] (handle_pte_fault+0x0/0x6d4) from [<c0091968>] (__handle_mm_fault+0x88/0x90)
[<c00918e0>] (__handle_mm_fault+0x0/0x90) from [<c00920e0>] (handle_mm_fault+0x28/0x2c)
[<c00920b8>] (handle_mm_fault+0x0/0x2c) from [<c001948c>] (do_page_fault+0x118/0x288)
[<c0019374>] (do_page_fault+0x0/0x288) from [<c000861c>] (do_PrefetchAbort+0x40/0x9c)
[<c00085dc>] (do_PrefetchAbort+0x0/0x9c) from [<c0008b58>] (ret_from_exception+0x0/0x10)
Exception stack(0xc6489fb0 to 0xc6489ff8)
9fa0: 0000021c 00000000 6df1d800 6df1d800
9fc0: b470b880 0000000f da4afeed b6fe04bc 00000040 5eedf00d b6fdb8f4 b6fba134
9fe0: 00000000 b470b858 b6f0ead4 b6f0ead4 60000010 ffffffff
r8:00000040 r7:b6fe04bc r6:ffffffff r5:60000010 r4:b6f0ead4
Mem-info:
Normal per-cpu:
CPU 0: hi: 42, btch: 7 usd: 0
CPU 1: hi: 42, btch: 7 usd: 0
HighMem per-cpu:
CPU 0: hi: 42, btch: 7 usd: 0
CPU 1: hi: 42, btch: 7 usd: 0
active_anon:7196 inactive_anon:7223 isolated_anon:0
active_file:1028 inactive_file:1457 isolated_file:0
unevictable:199 dirty:3 writeback:0 unstable:0
free:22844 slab_reclaimable:969 slab_unreclaimable:6547
mapped:685 shmem:0 pagetables:210 bounce:0
free_cma:0
Normal free:29092kB min:32768kB low:40960kB high:49152kB active_anon:0kB inactive_anon:0kB active_file:44kB inactive_file:128kB unevictable:44kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:124196kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:3876kB slab_unreclaimable:26188kB kernel_stack:576kB pagetables:840kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
lowmem_reserve[]: 0 1024 1024
HighMem free:62252kB min:128kB low:8772kB high:17416kB active_anon:28784kB inactive_anon:28892kB active_file:4068kB inactive_file:5700kB unevictable:752kB isolated(anon):0kB isolated(file):0kB present:131072kB managed:131072kB mlocked:0kB dirty:12kB writeback:0kB mapped:2740kB 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? no
lowmem_reserve[]: 0 0 0
Normal: 467*4kB (UEM) 285*8kB (UEM) 219*16kB (UEM) 93*32kB (UEM) 50*64kB (EM) 25*128kB (UEM) 11*256kB (UEM) 2*512kB (U) 0*1024kB 0*2048kB 2*4096kB (R) = 29060kB
HighMem: 5997*4kB (UM) 2743*8kB (UM) 478*16kB (UM) 27*32kB (UM) 2*64kB (M) 2*128kB (U) 1*256kB (U) 2*512kB (U) 0*1024kB 1*2048kB (U) 1*4096kB (R) = 62252kB
5489 total pagecache pages
2805 pages in swap cache
Swap cache stats: add 1237151, delete 1234346, find 539424/688368
Free swap = 484712kB
Total swap = 524284kB
65536 pages of RAM
23025 free pages
1661 reserved pages
7515 slab pages
819780 pages shared
2805 pages swap cached
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
TCP: too many orphaned sockets
再次，可用交换 = 484712kB - 大量未使用。为什么？
答案1
你的问题实际上就在这里：
Normal
free:29372kB
min:32768kB
low:40960kB
high:49152kB
active_anon:0kB
inactive_anon:0kB
active_file:44kB
inactive_file:128kB
unevictable:44kB
isolated(anon):0kB
isolated(file):0kB
present:131072kB
managed:124196kB
mlocked:0kB
dirty:0kB
writeback:0kB
mapped:0kB
shmem:0kB
slab_reclaimable:3876kB
slab_unreclaimable:26196kB
kernel_stack:576kB
pagetables:840kB
unstable:0kB
bounce:0kB
free_cma:0kB
writeback_tmp:0kB
pages_scanned:1064
all_unreclaimable? no
路由器上的内存被分成多个区域，一个区域 - HighMem 包含 128MiB 内存，另一个区域 - Normal 包含 128MiB 内存。
这些区域在功能上彼此独立。内存管理器以独立的方式在每个区域中工作。
oom-killer 在正常区域中被调用。当您查看请求时，您实际上可以消除 128Mib 的内存。
现在来看看实际的异常情况：
free: 29372kB
min: 32768kB
该min字段是内核对“当我低于此阈值时，我将不得不采取激烈措施来回收内存 - 例如 OOM-killer”的解释。什么是高度您的描述中关于此字段的不寻常之处在于，最小值被设置为多少。此值通常浮动在内存的 2% 左右，在本例中为整个区域的 25%。难怪您如此积极地进行 oom-kill！
当你查看问题输出时，问题的原因如下：
vm.min_free_kbytes = 32768
将此值更改为方式更低。或许1024这是一个更合理的数字。
您还会看到一些“孤立的 TCP 套接字”错误。您可能还希望减少和的值，net.ipv4.tcp_wmem这net.ipv4.tcp_rmem将允许您处理更多套接字（以延迟为代价）。
因此，回答您的问题，为什么要终止具有如此多可用交换的进程 - 答案是，vm.min_free_kb对于每个区域的实际内存量而言，该设置太高了。将此值从 32MiB 降低到 1MiB。
答案2
编辑：这个答案完全没有抓住问题。请参阅 Matthew Ife 关于 vm.min_free_kbytes 的疯狂高设置的帖子
路由器tor已经运行了一段时间了，对吗？
我怀疑您受到了外部（内存）碎片的影响。如果您查看 OOM 日志，您会发现有很多可用内存块，但如果没有一个块的大小达到要求的大小tor，则将malloc()失败。
Normal: 465*4kB (UEM) 285*8kB (UEM) 219*16kB (UEM) 92*32kB (UEM) 51*64kB (UEM) 25*128kB (UEM) 12*256kB (UEM) 2*512kB (U) 0*1024kB 0*2048kB 2*4096kB (R) = 29340kB
HighMem: 5997*4kB (UM) 2743*8kB (UM) 478*16kB (UM) 27*32kB (UM) 2*64kB (M) 2*128kB (U) 1*256kB (U) 2*512kB (U) 0*1024kB 1*2048kB (U) 1*4096kB (R) = 62252kB
编辑：正如 Matthew 指出的那样，有问题的 malloc() 请求顺序 0（单页）和顺序 1（双页）分配。我显然搞错了方向。
对于发生的事情有一个很好的解释elinux网站。遗憾的是，该演示文稿中提到的内存压缩似乎在 DD-WRT 中不可调整，尽管我可以找到可追溯到的变更集2010这表明它在内核中。
至于你应该做什么，tor我不太清楚。也许你可以为它运行一个看门狗，或者适时重新启动该进程（这应该有助于内核找到空间来清理内存）。也有可能设置得swappiness太高会减慢内存压缩过程，但我现在只是猜测。
答案3
你有几个明显的问题。
第一的：
vm.swappiness = 100
您已经告诉内核尽可能积极地进行交换，即使没有严格必要这样做。
在嵌入式设备上（通常根本没有交换），这完全是疯了。应该将其设置为 0（可能是最好的）或 1。
第二：
vm.overcommit_memory = 2
除了完全防止过度使用，并防止系统使用所有可用内存和交换之外，这还admin_reserve_kbytes导致为和中指定的管理员和用户进程保留额外的内存user_reserve_kbytes。
我找不到我管理的单个系统，无论是嵌入式、桌面还是服务器，其此设置都不为 0。
最后，关于 DD-WRT...我对他们不满意。他们前段时间过度商业化，停止了定期发布和更新。现在我推荐 OpenWrt 作为构建嵌入式系统的平台。