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| VM_PAGE_FREE(9) | FreeBSD Kernel Developer's Manual | VM_PAGE_FREE(9) |
NAME
vm_page_free, vm_page_free_toq,
vm_page_free_zero,
vm_page_try_to_free —
SYNOPSIS
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
void
vm_page_free(vm_page_t
m);
void
vm_page_free_toq(vm_page_t
m);
void
vm_page_free_zero(vm_page_t
m);
int
vm_page_try_to_free(vm_page_t
m);
DESCRIPTION
Thevm_page_free_toq() function moves a page into the
free queue, and disassociates it from its object. If the page is held, wired,
already free, or its busy count is not zero, the system will panic. If the
PG_ZERO flag is set on the page, it is placed at the
end of the free queue; otherwise, it is placed at the front.
If the page's object is of type OBJT_VNODE
and it is the last page associated with the object, the underlying vnode may
be freed.
The vm_page_free() and
vm_page_free_zero() functions both call
vm_page_free_toq() to actually free the page, but
vm_page_free_zero() sets the
PG_ZERO flag and
vm_page_free() clears the
PG_ZERO flag prior to the call to
vm_page_free_toq().
The vm_page_try_to_free() function
verifies that the page is not held, wired, busy or dirty, and if so, marks
the page as busy, drops any protection that may be set on the page, and
frees it.
RETURN VALUES
vm_page_try_to_free() returns 1 if it is able to free
the page; otherwise, 0 is returned.
SEE ALSO
vm_page_busy(9), vm_page_hold(9), vm_page_wire(9)AUTHORS
This manual page was written by Chad David <davidc@acns.ab.ca>.| July 24, 2001 | FreeBSD 13.1-RELEASE |
Visit the GSP FreeBSD Man Page Interface.
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