Just a note: Sun kernel patch 141445-09 (i86/amd64) and 141444-09 (SPARC) introduces zfs version 15 (zpool upgrade!), and the ::memstat-macro behaviour matches OpenSolaris:
Loading modules: [ unix krtld genunix specfs dtrace cpu.generic cpu_ms.AuthenticAMD.15 uppc pcplusmp ufs mpt ip hook neti sctp arp usba fcp fctl qlc lofs fcip cpc random crypto zfs logindmux ptm nfs ]
> ::memstat
Page Summary Pages MB %Tot
------------ ---------------- ---------------- ----
Kernel 2082351 8134 25%
ZFS File Data 3616346 14126 43%
Anon 1125938 4398 13%
Exec and libs 11206 43 0%
Page cache 961960 3757 11%
Free (cachelist) 286172 1117 3%
Free (freelist) 302471 1181 4%
Total 8386444 32759
Physical 8177548 31943

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