NAME¶

vm_page_io_start, vm_page_io_finish — ready or unready a page for I/O

SYNOPSIS¶

#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_page.h> void
vm_page_io_start(vm_page_t m); void
vm_page_io_finish(vm_page_t m);

DESCRIPTION¶

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.

AUTHORS¶

This manual page was written by Chad David ⟨davidc@acns.ab.ca⟩ and Alfred Perlstein ⟨alfred@FreeBSD.org⟩.