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⟩.