Eve*_*ard 6 low-memory oom sysctl
我正在运行带有 i2p 和 Tor 的 ARM 路由器 - Netgear R7000。当然，我已经向它添加了完整的 512 MB 的 SWAP 以防止 OOM，我知道它可能会减慢系统速度……但是我仍然可以从大量免费的 SWAP 开始获得 OOM 杀手，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运行……但似乎仍然无法交换tor。我什至试图关闭过度使用，但根本没有帮助。
请参阅下面的 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（除了将 SOHO 路由器用于 Tor，哈哈）？
PS：使用DD-WRT固件
编辑：另一个 OOM 杀手日志 - 这次没有关于重置按钮：
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)
[<c007
Mat*_*Ife 11
你的问题实际上在这里：
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 的内存，另一个区域，Normal 包含 128MiB 的内存。
该区域在功能上彼此独立。内存管理器以隔离的方式在每个区域中工作。
oom-killer 在正常区域被调用。当您查看您的请求时，您实际上可以消除 128Mib 的内存。
现在到实际的异常：
free: 29372kB
min: 32768kB
该min字段是内核对“当我低于这个阈值时，我将不得不做一些激烈的事情来回收内存——比如 OOM-killer”的解释。请告诉我非常不寻常的关于你的描述这个领域是到底有多少被设置为最小量。该值通常在内存的 2% 左右浮动，在本例中为整个区域的 25%。难怪你杀得这么凶！
Lo and behlod 在查看您的问题输出时，问题的原因如下：
vm.min_free_kbytes = 32768
改变这个值是什么方式降低。也许1024会是一个更合理的数字。
您还显示了一些“孤立的 tcp 套接字”错误。您可能还希望减少 和 的值net.ipv4.tcp_wmem，net.ipv4.tcp_rmem这将允许您处理更多套接字（以延迟为代价）。
因此，要回答您的问题，为什么要使用如此多的空闲交换杀死进程 - 答案是该vm.min_free_kb设置对于您在每个区域中拥有的实际内存量来说高得离谱。将此值从 32MiB 减少到 1MiB。
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