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SWAPON(2) Linux Programmer's Manual SWAPON(2)
NAME
swapon, swapoff - start/stop swapping to file/device
SYNOPSIS
#include <unistd.h>
#include <asm/page.h> /* to find PAGE_SIZE */
#include <sys/swap.h>
int swapon(const char *path, int swapflags);
int swapoff(const char *path);
DESCRIPTION
swapon() sets the swap area to the file or block device specified by
path. swapoff() stops swapping to the file or block device specified
by path.
swapon() takes a swapflags argument. If swapflags has the
SWAP_FLAG_PREFER bit turned on, the new swap area will have a higher
priority than default. The priority is encoded within swapflags as:
(prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK
These functions may only be used by a privileged process (one having
the CAP_SYS_ADMIN capability).
PRIORITY
Each swap area has a priority, either high or low. The default prior-
ity is low. Within the low-priority areas, newer areas are even lower
priority than older areas.
All priorities set with swapflags are high-priority, higher than
default. They may have any non-negative value chosen by the caller.
Higher numbers mean higher priority.
Swap pages are allocated from areas in priority order, highest priority
first. For areas with different priorities, a higher-priority area is
exhausted before using a lower-priority area. If two or more areas
have the same priority, and it is the highest priority available, pages
are allocated on a round-robin basis between them.
As of Linux 1.3.6, the kernel usually follows these rules, but there
are exceptions.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is
set appropriately.
ERRORS
EBUSY (for swapon()) The specified path is already being used as a
swap area.
EINVAL The file path exists, but refers neither to a regular file nor
to a block device; or, for swapon(), the indicated path does not
contain a valid swap signature; or, for swapoff(), path is not
currently a swap area.
ENFILE The system limit on the total number of open files has been
reached.
ENOENT The file path does not exist.
ENOMEM The system has insufficient memory to start swapping.
EPERM The caller does not have the CAP_SYS_ADMIN capability, or all
MAX_SWAPFILES (earlier 8; 32 since Linux 2.4.10) are in use.
CONFORMING TO
These functions are Linux specific and should not be used in programs
intended to be portable. The second swapflags argument was introduced
in Linux 1.3.2.
NOTES
The partition or path must be prepared with mkswap(8).
SEE ALSO
mkswap(8), swapoff(8), swapon(8)
Linux 2.6.7 2004-10-10 SWAPON(2)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Tue Feb 13 02:17:36 GMT 2007
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