请大神们帮小白分析一个mysql挂掉原因

160911 05:32:28 mysqld_safe Number of processes running now: 0
160911 05:32:28 mysqld_safe mysqld restarted
160911  5:32:35 [Note] Plugin 'FEDERATED' is disabled.
160911  5:32:36 InnoDB: The InnoDB memory heap is disabled
160911  5:32:36 InnoDB: Mutexes and rw_locks use GCC atomic builtins
160911  5:32:36 InnoDB: Compressed tables use zlib 1.2.3
160911  5:32:36 InnoDB: Using Linux native AIO
160911  5:32:36 InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: mmap(137363456 bytes) failed; errno 12
160911  5:32:36 InnoDB: Completed initialization of buffer pool
160911  5:32:36 InnoDB: Fatal error: cannot allocate memory for the buffer pool
160911  5:32:36 [ERROR] Plugin 'InnoDB' init function returned error.
160911  5:32:36 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
160911  5:32:36 [ERROR] Unknown/unsupported storage engine: InnoDB
160911  5:32:36 [ERROR] Aborting

160911  5:32:36 [Note] /alidata/server/mysql/bin/mysqld: Shutdown complete

160911 05:32:36 mysqld_safe mysqld from pid file /alidata/server/mysql/data/iZ28jy75s3vZ.pid ended