pmap_zero_area(9) [freebsd man page]

PMAP_ZERO(9)						   BSD Kernel Developer's Manual					      PMAP_ZERO(9)

NAME

     pmap_zero_page, pmap_zero_area, pmap_zero_idle -- zero-fill a page using machine-dependent optimizations

SYNOPSIS

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

     void
     pmap_zero_page(vm_page_t m);

     void
     pmap_zero_page_area(vm_page_t m, int off, int size);

     void
     pmap_zero_page_idle(vm_page_t m);

DESCRIPTION

     The pmap_zero_page() function zero-fills an entire page using machine-dependent optimizations.  The pmap_zero_page_area() function is used to
     zero-fill an area of a page.  The range specified must not cross a page boundary; it must be contained entirely within a single page.

     The pmap_zero_page_idle() interface is used by the vm_pagezero process.  The system-wide Giant lock should not be required to be held in
     order to call this interface.

IMPLEMENTATION NOTES

     This function is required to be implemented for each architecture supported by FreeBSD.

SEE ALSO

     bzero(3), pmap(9)

AUTHORS

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

BSD
								   July 21, 2003							       BSD

VM_FAULT_PREFAULT(9)					   BSD Kernel Developer's Manual				      VM_FAULT_PREFAULT(9)

NAME

     vm_fault_prefault -- cluster page faults into a process's address space

SYNOPSIS

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

     void
     vm_fault_prefault(pmap_t pmap, vm_offset_t addra, vm_map_entry_t entry);

DESCRIPTION

     The vm_fault_prefault() function provides a means of clustering pagefaults into a process's address space.  It operates upon the physical map
     pmap.  The entry argument specifies the entry to be prefaulted; the addra argument specifies the beginning of the mapping in the process's
     virtual address space.

     It is typically called by vm_fault() after the first page fault.  It benefits the execve(2) system call by eliminating repetitive calls to
     vm_fault(), which would otherwise be made to bring the process's executable pages into physical memory.

IMPLEMENTATION NOTES

     This is a machine-independent function which calls the machine-dependent pmap_is_prefaultable(9) helper function to determine if a page may
     be prefaulted into physical memory.

SEE ALSO

     execve(2), pmap_is_prefaultable(9)

AUTHORS

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

BSD
								   July 21, 2003							       BSD