Provided by: systemtap-doc_2.3-1ubuntu1.4_all 

NAME
probe::nfs.aop.writepage - NFS client writing a mapped page to the NFS server
SYNOPSIS
nfs.aop.writepage
VALUES
ino
inode number
i_state
inode state flags
page_index
offset within mapping, can used a page identifier and position identifier in the page frame
for_kupdate
a flag of writeback_control, indicates if it's a kupdate writeback
__page
the address of page
dev
device identifier
wsize
write size
i_flag
file flags
for_reclaim
a flag of writeback_control, indicates if it's invoked from the page allocator
i_size
file length in bytes
sb_flag
super block flags
size
number of pages to be written in this execution
DESCRIPTION
The priority of wb is decided by the flags for_reclaim and for_kupdate.
SystemTap Tapset Reference March 2016 PROBE::NFS.AOP.W(3stap)