PMAP_IS_MODIFIED(9)    FreeBSD Kernel Developer's Manual   PMAP_IS_MODIFIED(9)

NAME
     pmap_is_modified, pmap_ts_modified - return information about physical
     pages

SYNOPSIS
     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/pmap.h>

     boolean_t
     pmap_is_modified(vm_page_t m);

     int
     pmap_ts_referenced(vm_page_t m);

DESCRIPTION
     The pmap_is_modified() and pmap_ts_referenced() functions return
     information about physical pages.

RETURN VALUES
     The pmap_is_modified() function returns the status of the "page modified"
     bit for the physical page m.

     The pmap_ts_referenced() function returns a count of reference bits for a
     page m, clearing those bits.  It is not necessary for every reference bit
     to be cleared, but it is necessary that 0 only be returned when there are
     no remaining reference bits set on the page.

SEE ALSO
     pmap(9), pmap_clear_modify(9)

AUTHORS
     This manual page was written by Bruce M Simpson <bms@spc.org>.

FreeBSD 13.1-RELEASE-p6          July 17, 2014         FreeBSD 13.1-RELEASE-p6