MYsql经常无缘无故关闭，之后无法重启

150505 16:57:01 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
150505 16:58:01 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
150505 16:58:01 [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead.
150505 16:58:01 [Note] Plugin 'FEDERATED' is disabled.
150505 16:58:01 InnoDB: The InnoDB memory heap is disabled
150505 16:58:01 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150505 16:58:01 InnoDB: Compressed tables use zlib 1.2.8
150505 16:58:01 InnoDB: Using Linux native AIO
150505 16:58:01 InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: mmap(137363456 bytes) failed; errno 12
150505 16:58:01 InnoDB: Completed initialization of buffer pool
150505 16:58:01 InnoDB: Fatal error: cannot allocate memory for the buffer pool
150505 16:58:01 [ERROR] Plugin 'InnoDB' init function returned error.
150505 16:58:01 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
150505 16:58:01 [ERROR] Unknown/unsupported storage engine: InnoDB
150505 16:58:01 [ERROR] Aborting
150505 16:57:01 mysqld_safe mysqld from pid fil