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VM_FAULT_PREFAULT (9) | Kernel routines | Unix Manual Pages | :man

NAME

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

CONTENTS

Synopsis
Description
Implementation Notes
See Also
Authors

SYNOPSIS


.In sys/param.h
.In vm/vm.h
.In 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


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