Provided by: freebsd-manpages_7.0-2_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 PG_WANTED. A page is typically marked PG_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 〈email@example.com〉 and Alfred