Differences betwen heap stats and dump dump_mempools

[展荣臻（信泰） <zhanrzh_xt@xxxxxxxxxxxxxx>]

 Hello,all
    "ceph daemon osd.0 heap stats" or ceph daemon osd.0 dump_mempools" analyse memory of osd used.
    The "Virtual address space used" of "ceph daemon osd.0 heap stats" output is lager than total.bytes of "ceph daemon osd.0 dump_mempools"output.
    I dig into source code and I find the memory of "ceph daemon osd.0 heap stats" output is allocated by malloc. Is it contain memory of dump_mempools output? what differences betwen them?
    thanks for any reply.
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