table of contents
VM_FAULT_PREFAULT(9) | 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¶
Thevm_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>.July 21, 2003 | Linux 4.19.0-10-amd64 |