Provided by: freebsd-manpages_8.2-1_all
vm_page_io_start, vm_page_io_finish — ready or unready a page for I/O
#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);
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 <email@example.com> and Alfred Perlstein <alfred@FreeBSD.org>.