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vm_page_free_toq (9)
  • >> vm_page_free_toq (9) ( FreeBSD man: Ядро )

  • BSD mandoc
     

    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_busy9, vm_page_hold9, vm_page_wire9  

    AUTHORS

    This manual page was written by An Chad David Aq davidc@acns.ab.ca .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    SEE ALSO
    AUTHORS


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