我正在使用 LXC 和 virt-manager (libvirt) 来托管 Bind DNS 服务器，分配了 512MB RAM。虚拟机位于 ZFS 文件系统上（Linux 上的 ZFS）
最近我遇到了内存不足的情况，但我找不到哪个进程消耗了内存。在日志中，大多数内存消耗inactive_anon超过 300MB，并且active_anon
有人能帮我找出导致这种情况的原因吗？如何释放该内存？
我不认为重新启动 LXC VM 是一个解决方案。
看一下第二个代码示例：
inactive_anon:216272KB active_anon:266004KB
环境：
Linux 0.6.5.7-8-jessie 上的 ZFS
compression:lz4 dedup:off
Debian 8.6 Jessie x86_64，英特尔奔腾 G4400，16GB RAM
Linux 版本 4.3.0-0.bpo.1-amd64 ([电子邮件保护]) (gcc 版本 4.9.2 (Debian 4.9.2-10) ) #1 SMP Debian 4.3.3-7~bpo8+1 (2016-01-19)
Memory cgroup out of memory: Kill process 3273 (named) score 113 or sacrifice child
Killed process 3273 (named) total-vm:282176kB, anon-rss:59172kB, file-rss:0kB
mandb invoked oom-killer: gfp_mask=0xd0, order=0, oom_score_adj=0
mandb cpuset=machine-lxc\x2d03_dns.scope mems_allowed=0
CPU: 1 PID: 27944 Comm: mandb Tainted: P W O 4.3.0-0.bpo.1-amd64 #1 Debian 4.3.3-7~bpo8+1
Hardware name: System manufacturer System Product Name/H110M-A, BIOS 0501 11/16/2015
0000000000000000 000000009e067aef ffffffff812e1889 ffff8801917b7e40
ffffffff811ccbba ffff880409835700 ffff880436d13280 ffff880100000000
0000000000015d80 ffffffff81163b12 ffff88003697f1b0 000000009e067aef
Call Trace:
[<ffffffff812e1889>] ? dump_stack+0x40/0x57
[<ffffffff811ccbba>] ? dump_header+0xa7/0x23b
[<ffffffff81163b12>] ? find_lock_task_mm+0x52/0xc0
[<ffffffff811640ab>] ? oom_kill_process+0x1fb/0x400
[<ffffffff810fd37f>] ? css_next_descendant_pre+0x1f/0x50
[<ffffffff811c5320>] ? mem_cgroup_iter+0x1b0/0x3b0
[<ffffffff811c740f>] ? mem_cgroup_out_of_memory+0x28f/0x2d0
[<ffffffff811c7fcd>] ? mem_cgroup_oom_synchronize+0x32d/0x340
[<ffffffff811c38d0>] ? mem_cgroup_begin_page_stat+0x90/0x90
[<ffffffff81164804>] ? pagefault_out_of_memory+0x44/0xc0
[<ffffffff8158c5b8>] ? page_fault+0x28/0x30
Task in /machine.slice/machine-lxc\x2d03_dns.scope killed as a result of limit of /machine.slice/machine-lxc\x2d03_dns.scope
memory: usage 524288kB, limit 524288kB, failcnt 48845
memory+swap: usage 0kB, limit 9007199254740988kB, failcnt 0
kmem: usage 0kB, limit 9007199254740988kB, failcnt 0
Memory cgroup stats for /machine.slice/machine-lxc\x2d03_dns.scope: cache:413924KB rss:110364KB rss_huge:0KB mapped_file:7860KB dirty:0KB writeback:0KB inactive_anon:187496KB active_anon:336768KB inactive_file:0KB active_file:0KB unevictable:0KB
[ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name
[ 6048] 0 6048 41741 999 47 3 0 0 libvirt_lxc
[ 6049] 0 6049 6967 290 19 3 0 0 systemd
[ 6071] 0 6071 8242 2032 22 3 0 0 systemd-journal
[ 6147] 0 6147 13795 168 31 3 0 -1000 sshd
[ 6148] 0 6148 6476 60 17 3 0 0 cron
[ 6150] 0 6150 65721 354 30 3 0 0 rsyslogd
[ 6154] 0 6154 3166 39 11 3 0 0 agetty
[27938] 0 27938 10191 86 24 3 0 0 cron
[27939] 0 27939 1084 21 8 3 0 0 sh
[27940] 0 27940 1056 19 7 3 0 0 run-parts
[27941] 0 27941 1084 21 7 3 0 0 man-db
[27944] 6 27944 37727 26396 79 3 0 0 mandb
Memory cgroup out of memory: Kill process 15882 (mandb) score 80 or sacrifice child
Killed process 15882 (mandb) total-vm:99416kB, anon-rss:42008kB, file-rss:8kB
apt-get invoked oom-killer: gfp_mask=0xd0, order=0, oom_score_adj=0
apt-get cpuset=machine-lxc\x2d03_dns.scope mems_allowed=0
CPU: 0 PID: 15849 Comm: apt-get Tainted: P W O 4.3.0-0.bpo.1-amd64 #1 Debian 4.3.3-7~bpo8+1
Hardware name: System manufacturer System Product Name/H110M-A, BIOS 0501 11/16/2015
0000000000000000 0000000026367b10 ffffffff812e1889 ffff880108f63e40
ffffffff811ccbba ffffffff81111d60 0000000000000000 0000000026367b10
0000000000000000 ffffffff81163b12 ffff88011e372ab0 0000000026367b10
Call Trace:
[<ffffffff812e1889>] ? dump_stack+0x40/0x57
[<ffffffff811ccbba>] ? dump_header+0xa7/0x23b
[<ffffffff81111d60>] ? kprobe_flush_task+0x90/0x120
[<ffffffff81163b12>] ? find_lock_task_mm+0x52/0xc0
[<ffffffff811640ab>] ? oom_kill_process+0x1fb/0x400
[<ffffffff810fd37f>] ? css_next_descendant_pre+0x1f/0x50
[<ffffffff811c5320>] ? mem_cgroup_iter+0x1b0/0x3b0
[<ffffffff811c740f>] ? mem_cgroup_out_of_memory+0x28f/0x2d0
[<ffffffff811c7fcd>] ? mem_cgroup_oom_synchronize+0x32d/0x340
[<ffffffff811c38d0>] ? mem_cgroup_begin_page_stat+0x90/0x90
[<ffffffff81164804>] ? pagefault_out_of_memory+0x44/0xc0
[<ffffffff8158c5b8>] ? page_fault+0x28/0x30
Task in /machine.slice/machine-lxc\x2d03_dns.scope killed as a result of limit of /machine.slice/machine-lxc\x2d03_dns.scope
memory: usage 482284kB, limit 524288kB, failcnt 82266
memory+swap: usage 0kB, limit 9007199254740988kB, failcnt 0
kmem: usage 0kB, limit 9007199254740988kB, failcnt 0
Memory cgroup stats for /machine.slice/machine-lxc\x2d03_dns.scope: cache:463692KB rss:18592KB rss_huge:0KB mapped_file:15208KB dirty:0KB writeback:0KB inactive_anon:216272KB active_anon:266004KB inactive_file:0KB active_file:4KB unevictable:0KB
[ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name
[ 6048] 0 6048 41741 1000 47 3 0 0 libvirt_lxc
[ 6049] 0 6049 6967 291 19 3 0 0 systemd
[ 6147] 0 6147 13795 168 31 3 0 -1000 sshd
[ 6148] 0 6148 6476 59 17 3 0 0 cron
[ 6150] 0 6150 65721 354 30 3 0 0 rsyslogd
[ 6154] 0 6154 3166 39 11 3 0 0 agetty
[25585] 0 25585 12338 5113 29 3 0 0 systemd-journal
[15728] 0 15728 20680 262 43 3 0 0 sshd
[15730] 0 15730 5064 124 15 3 0 0 bash
[15756] 0 15756 20647 277 44 3 0 0 sshd
[15760] 0 15760 5064 78 15 3 0 0 bash
[15849] 0 15849 16558 1418 38 3 0 0 apt-get
[15869] 0 15869 6901 1485 19 3 0 0 dpkg
[15881] 0 15881 1084 21 8 3 0 0 man-db.postinst
Memory cgroup out of memory: Kill process 25585 (systemd-journal) score 38 or sacrifice child
Killed process 25585 (systemd-journal) total-vm:49352kB, anon-rss:252kB, file-rss:20200kB
在虚拟机中完成一些工作之后
Memory cgroup out of memory: Kill process 15882 (mandb) score 80 or sacrifice child
Killed process 15882 (mandb) total-vm:99416kB, anon-rss:42008kB, file-rss:8kB
apt-get invoked oom-killer: gfp_mask=0xd0, order=0, oom_score_adj=0
apt-get cpuset=machine-lxc\x2d03_dns.scope mems_allowed=0
CPU: 0 PID: 15849 Comm: apt-get Tainted: P W O 4.3.0-0.bpo.1-amd64 #1 Debian 4.3.3-7~bpo8+1
Hardware name: System manufacturer System Product Name/H110M-A, BIOS 0501 11/16/2015
0000000000000000 0000000026367b10 ffffffff812e1889 ffff880108f63e40
ffffffff811ccbba ffffffff81111d60 0000000000000000 0000000026367b10
0000000000000000 ffffffff81163b12 ffff88011e372ab0 0000000026367b10
Call Trace:
[<ffffffff812e1889>] ? dump_stack+0x40/0x57
[<ffffffff811ccbba>] ? dump_header+0xa7/0x23b
[<ffffffff81111d60>] ? kprobe_flush_task+0x90/0x120
[<ffffffff81163b12>] ? find_lock_task_mm+0x52/0xc0
[<ffffffff811640ab>] ? oom_kill_process+0x1fb/0x400
[<ffffffff810fd37f>] ? css_next_descendant_pre+0x1f/0x50
[<ffffffff811c5320>] ? mem_cgroup_iter+0x1b0/0x3b0
[<ffffffff811c740f>] ? mem_cgroup_out_of_memory+0x28f/0x2d0
[<ffffffff811c7fcd>] ? mem_cgroup_oom_synchronize+0x32d/0x340
[<ffffffff811c38d0>] ? mem_cgroup_begin_page_stat+0x90/0x90
[<ffffffff81164804>] ? pagefault_out_of_memory+0x44/0xc0
[<ffffffff8158c5b8>] ? page_fault+0x28/0x30
Task in /machine.slice/machine-lxc\x2d03_dns.scope killed as a result of limit of /machine.slice/machine-lxc\x2d03_dns.scope
memory: usage 482284kB, limit 524288kB, failcnt 82266
memory+swap: usage 0kB, limit 9007199254740988kB, failcnt 0
kmem: usage 0kB, limit 9007199254740988kB, failcnt 0
Memory cgroup stats for /machine.slice/machine-lxc\x2d03_dns.scope: cache:463692KB rss:18592KB rss_huge:0KB mapped_file:15208KB dirty:0KB writeback:0KB inactive_anon:216272KB active_anon:266004KB inactive_file:0KB active_file:4KB unevictable:0KB
[ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name
[ 6048] 0 6048 41741 1000 47 3 0 0 libvirt_lxc
[ 6049] 0 6049 6967 291 19 3 0 0 systemd
[ 6147] 0 6147 13795 168 31 3 0 -1000 sshd
[ 6148] 0 6148 6476 59 17 3 0 0 cron
[ 6150] 0 6150 65721 354 30 3 0 0 rsyslogd
[ 6154] 0 6154 3166 39 11 3 0 0 agetty
[25585] 0 25585 12338 5113 29 3 0 0 systemd-journal
[15728] 0 15728 20680 262 43 3 0 0 sshd
[15730] 0 15730 5064 124 15 3 0 0 bash
[15756] 0 15756 20647 277 44 3 0 0 sshd
[15760] 0 15760 5064 78 15 3 0 0 bash
[15849] 0 15849 16558 1418 38 3 0 0 apt-get
[15869] 0 15869 6901 1485 19 3 0 0 dpkg
[15881] 0 15881 1084 21 8 3 0 0 man-db.postinst
Memory cgroup out of memory: Kill process 25585 (systemd-journal) score 38 or sacrifice child
Killed process 25585 (systemd-journal) total-vm:49352kB, anon-rss:252kB, file-rss:20200kB