05-04-2013
What 4 Gigabytes memory limit? This is not Microsoft Windows NT.
There is a 2 Gigabyte file size addressing limit with 32-bit HP-UX Operating Systems. The theoretical 2 Gigabyte memory addressing limit in HP-UX was addressed by changing the page size such that the the maximum became a multiple of the page size. Watch the boot-up on a large memory 32-bit system (16 Gb) when it relocates memory. You should see the same on a 4 Gigabyte memory system.
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Hello !!
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VSLOCK(9) BSD Kernel Developer's Manual VSLOCK(9)
NAME
vslock, vsunlock -- lock/unlock user space addresses in memory
SYNOPSIS
#include <sys/param.h>
#include <sys/proc.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
int
vslock(void *addr, size_t len);
void
vsunlock(void *addr, size_t len);
DESCRIPTION
The vslock() and vsunlock() functions respectively lock and unlock a range of addresses belonging to the currently running process into mem-
ory. The actual amount of memory locked is a multiple of the machine's page size. The starting page number is computed by truncating addr
to the nearest preceding page boundary, and by rounding up addr + len to the next page boundary. The process context to use for this opera-
tion is taken from the global variable curproc.
RETURN VALUES
The vslock() function will return 0 on success, otherwise it will return one of the errors listed below.
ERRORS
The vslock() function will fail if:
[EINVAL] The addr and len parameters specify a memory range that wraps around the end of the machine address space.
[ENOMEM] The size of the specified address range exceeds the system limit on locked memory.
[ENOMEM] Locking the requested address range would cause the process to exceed its per-process locked memory limit.
[EFAULT] Some portion of the indicated address range is not allocated. There was an error faulting/mapping a page.
BSD
August 10, 2004 BSD