top - 22:05:20 up 11 days, 22:11,  1 user,  load average: 0.06, 1.16, 6.88
Tasks: 151 total,   2 running, 149 sleeping,   0 stopped,   0 zombie
%Cpu(s):  2.0 us,  0.3 sy,  0.0 ni, 97.7 id,  0.0 wa,  0.0 hi,  0.0 si,  0.0 st
KiB Mem :  1016656 total,    66612 free,   826048 used,   123996 buff/cache
KiB Swap:        0 total,        0 free,        0 used.    41128 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND
17204 apache    20   0  866468  22012   2936 S  2.0  2.2   0:00.53 php-fpm
17654 root      20   0  780056   5296    800 S  0.3  0.5  32:01.89 AliHids
    1 root      20   0  203788   2696   1044 S  0.0  0.3   0:29.33 systemd
    2 root      20   0       0      0      0 S  0.0  0.0   0:00.02 kthreadd
    3 root      20   0       0      0      0 S  0.0  0.0   0:03.64 ksoftirqd/0
    5 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 kworker/0:0H
    7 root      rt   0       0      0      0 S  0.0  0.0   0:00.00 migration/0
    8 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcu_bh
    9 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/0
   10 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/1
   11 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/2
   12 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/3
   13 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/4
   14 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/5
   15 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/6
   16 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/7
   17 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/8
   18 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/9
   19 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/10
   20 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/11
   21 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/12
   22 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/13
   23 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuob/14
   24 root      20   0       0      0      0 S  0.0  0.0   2:30.44 rcu_sched
   25 root      20   0       0      0      0 R  0.0  0.0   5:49.24 rcuos/0
   26 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuos/1
   27 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuos/2
   28 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuos/3
   29 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuos/4
   30 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuos/5
   31 root      20   0       0      0      0 S  0.0  0.0   0:00.00 rcuos/6

阿里云ECS,安装的数据库再次无法启动，提示内存不足。可我的网站就我一个人访问啊。。。。
1G内存就剩下70MB左右了，哪去了。很多 rcuos/1 rcuos/2 rcuos/3之类的。这些是什么程序？

/var/log/mariadb/mariadb.log 报错内容：

 150629 22:02:44 [Note] /usr/libexec/mysqld: Shutdown complete

150629 22:02:44 mysqld_safe mysqld from pid file /var/run/mariadb/mariadb.pid ended
150629 22:20:11 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
150629 22:20:11 InnoDB: The InnoDB memory heap is disabled
150629 22:20:11 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150629 22:20:11 InnoDB: Compressed tables use zlib 1.2.7
150629 22:20:11 InnoDB: Using Linux native AIO
150629 22:20:11 InnoDB: Initializing buffer pool, size = 128.0M
150629 22:20:11 InnoDB: Completed initialization of buffer pool
150629 22:20:11 InnoDB: highest supported file format is Barracuda.
150629 22:20:11  InnoDB: Waiting for the background threads to start
150629 22:20:12 Percona XtraDB (http://www.percona.com) 5.5.40-MariaDB-36.1 started; log sequence number 1597945
150629 22:20:12 [Note] Plugin 'FEEDBACK' is disabled.
150629 22:20:12 [Note] Server socket created on IP: '0.0.0.0'.
150629 22:20:12 [Note] Event Scheduler: Loaded 0 events
150629 22:20:12 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.5.41-MariaDB'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MariaDB Server
150629 22:20:16 [ERROR] mysqld: Table './new_dalu/tb_info' is marked as crashed and should be repaired
150629 22:20:16 [Warning] Checking table:   './new_dalu/tb_info'
150629 22:20:20 [ERROR] mysqld: Table './new_dalu/tb_hit_log' is marked as crashed and should be repaired
150629 22:20:20 [Warning] Checking table:   './new_dalu/tb_hit_log'
150629 22:20:21 [ERROR] Got an error from unknown thread, /builddir/build/BUILD/mariadb-5.5.41/storage/myisam/ha_myisam.cc:936
150629 22:20:21 [Warning] Recovering table: './new_dalu/tb_hit_log'
150629 22:20:21 [Note] Found 81732 of 81730 rows when repairing './new_dalu/tb_hit_log'
150629 22:20:39 [ERROR] mysqld: Table './new_dalu/tb_member' is marked as crashed and should be repaired
150629 22:20:39 [ERROR] mysqld: Table './new_dalu/tb_member' is marked as crashed and should be repaired
150629 22:20:39 [Warning] Checking table:   './new_dalu/tb_member'
150629 22:24:27 [ERROR] mysqld: Table './new_dalu/tb_info_anon' is marked as crashed and should be repaired
150629 22:24:27 [Warning] Checking table:   './new_dalu/tb_info_anon'