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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〉.