Ceph » RADOS

My env :
[store@server01 ~]$ ceph -v
ceph version 13.2.5 (cbff874f9007f1869bfd3821b7e33b2a6ffd4988) mimic (stable)
[store@server01 ~]$ cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)

In my ceph.conf, i have:
osd_memory_target = 536870912

But, in my cluster,there is an OSD get into trouble,it used about 9G memory.

and I tried to investigate its memory usage but blocked

[root@server08 test]# ceph tell osd.192 heap start_profiler