.TH SWAP 3
.SH NAME
swap \- memory usage statistics and pagefile control
.SH SYNOPSIS
.nf
.B bind -a #¶ /dev

.B /dev/swap
.fi
.SH DESCRIPTION
The
.B swap
device holds a text block giving memory usage statistics:
.IP
.EX
\fIn\fP memory
\fIn\fP pagesize
\fIn\fP kernel
\fIn\fP/\fIm\fP user
\fIn\fP/\fIm\fP swap
\fIa\fP/\fIn\fP/\fIm\fP kernel malloc
\fIa\fP/\fIn\fP/\fIm\fP kernel draw
.EE
.PP
These are total memory (bytes), system page size (bytes),
kernel memory (pages), user memory (pages), swap space (pages),
kernel malloced data (bytes), and kernel graphics data (bytes).
The expression
.IR n / m
indicates
.I n
used out of
.I m
available.
For kernel malloc and kernel draw,
.IR a
indicates the current allocation in bytes.
These numbers are not blank padded.
.PP
To turn on swapping, write to
.B swap
the textual file descriptor number of a file or device on which to swap.
.SH SEE ALSO
.IR swap (8).
.SH SOURCE
.B /sys/src/9/port/devswap.c