VM_PAGE_BUSY(9) BSD Kernel Developer's Manual VM_PAGE_BUSY(9)NAME
vm_page_busy, vm_page_flash, vm_page_wakeup -- handle the busying and unbusying of a page
SYNOPSIS
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
void
vm_page_busy(vm_page_t m);
void
vm_page_flash(vm_page_t m);
void
vm_page_wakeup(vm_page_t m);
DESCRIPTION
These functions handle the busying, unbusying and notification of the unbusying of a page.
vm_page_busy() sets the VPO_BUSY flag in the page.
vm_page_flash() checks to see if there is anybody waiting on the page (VPO_WANTED will be set), and if so, clears the VPO_WANTED flag and
notifies whoever is waiting via wakeup().
vm_page_wakeup() clears the VPO_BUSY flag on the page, and calls vm_page_flash() in case somebody has been waiting for it.
SEE ALSO vm_page_sleep_if_busy(9), wakeup(9)AUTHORS
This manual page was written by Chad David <davidc@acns.ab.ca>.
BSD July 14, 2001 BSD
Check Out this Related Man Page
VM_PAGE_FREE(9) BSD 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 -- free a page
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
The vm_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>.
BSD July 24, 2001 BSD
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