Most of freelist memory went to ZFS file data

Hi

i was doing some testing and i noticed this weird behaviour.

Initial memstat right after reboot

there was 1.1G in freelist

root@solaris11:~# echo ::memstat | mdb -k

Page Summary                 Pages             Bytes  %Tot

----------------- ----------------  ----------------  ----

Kernel                      116363            454.5M   18%

ZFS Metadata                 25338             98.9M    4%

ZFS File Data               105229            411.0M   16%

Anon                         50361            196.7M    8%

Exec and libs                 3276             12.7M    1%

Page cache                   11965             46.7M    2%

Free (cachelist)               390              1.5M    0%

Free (freelist)             306492              1.1G   48%

Total                       639887              2.4G

I tried to perform a make file operation in order to make the system "busy"

root@solaris11:~# mkfile 5g /export/home/testfile

-rw-------   1 root     root     5368709120 May 23 18:34 testfile

Once the mkfile operation has completed, most of the memory from freelist went to ZFS file data and it never came back to freelist.