vm_fault_prefault(9) [freebsd man page]

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

Check Out this Related Man Page

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

NAME

     pmap_object_init_pt -- initialize page tables for a VM object

SYNOPSIS

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

     void
     pmap_object_init_pt(pmap_t pmap, vm_offset_t addr, vm_object_t object, vm_pindex_t pindex, vm_size_t size, int limit);

DESCRIPTION

     The pmap_object_init_pt() function preloads the page table entries into the specified physical map pmap, for the given object at the virtual
     address addr, for size bytes, beginning at the page index pindex within the object.  The map bits limit are heeded when creating the mapping.

IMPLEMENTATION NOTES

     This function is not strictly required by an architecture's pmap(9) implementation, but it does provide performance benefits if implemented.

     It is intended to eliminate the blast of soft faults on process startup, and immediately following a call to mmap(2).

SEE ALSO

     pmap(9), vm_map(9)

AUTHORS

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

BSD
								   July 21, 2003							       BSD

Linux and UNIX Man Pages

vm_fault_prefault(9) [freebsd man page]

Check Out this Related Man Page