An Example session where you try to map a virt address to a physical address,
and directly read the contents from the physical address (using /dev/mem).

Find out as:
ahp, anon_map, anon_hdr,
data: segvn_data,
enable log: $>/swappages
Take vnode pointer: <ptr> $<vpages  # display all vpages
Search vpages which has the same offset displayed by
struct anon contents.
The virtual pages listing has the virt address at the begin for each entry.
From the begining of the virt address, search for the page address.
It is some reasonable hex number in the header:
Then dd if=/dev/mem of=/mypage bs=8K count=1 iseek=39603
Then look into the /mypage at the hex virt addr offset of the buf
pointer in od process (0x26894 - 0x2600 = 0x894 is the offset in to
the current page)