Provided by: freebsd-manpages_8.2-1_all
vm_page_io_start, vm_page_io_finish -- ready or unready a page for I/O
The vm_page_io_start() function prepares the page for I/O by incrementing
its busy flag by one.
The vm_page_io_finish() function lowers the busy count on the page by
one, if the resulting busy count is zero, a wakeup(9) will be issued if
the page has been marked VPO_WANTED. A page is typically marked
VPO_WANTED by a thread to register its interest in the page to either
complete I/O or becoming available for general use.
This manual page was written by Chad David <firstname.lastname@example.org> and Alfred