2017-10-29 22:09:54 +00:00
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.TH SWAP 3
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.SH NAME
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2017-10-30 00:55:58 +00:00
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swap \- memory usage statistics and swap file control
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2017-10-29 22:09:54 +00:00
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.SH SYNOPSIS
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.nf
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.B bind -a #¶ /dev
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.B /dev/swap
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.fi
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.SH DESCRIPTION
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The
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.B swap
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device holds a text block giving memory usage statistics:
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.IP
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.EX
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\fIn\fP memory
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\fIn\fP pagesize
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\fIn\fP kernel
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\fIn\fP/\fIm\fP user
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\fIn\fP/\fIm\fP swap
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\fIa\fP/\fIn\fP/\fIm\fP kernel malloc
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\fIa\fP/\fIn\fP/\fIm\fP kernel draw
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\fIa\fP/\fIn\fP/\fIm\fP kernel secret
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.EE
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.PP
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These are total memory (bytes), system page size (bytes),
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kernel memory (pages), user memory (pages), swap space (pages),
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kernel malloced data (bytes), kernel graphics data (bytes)
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and kernel secret data (bytes).
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The expression
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.IR n / m
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indicates
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.I n
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used out of
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.I m
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available.
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For kernel malloc and kernel draw,
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.IR a
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indicates the current allocation in bytes.
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These numbers are not blank padded.
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.PP
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To turn on swapping, write to
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.B swap
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the textual file descriptor number of a file or device on which to swap.
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.PP
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Only the hostowner is allowed to enable swapping. The pages written to
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the swap file are transparently encrypted by the kernel using a random key.
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2017-10-29 22:09:54 +00:00
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.SH SEE ALSO
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2017-10-30 00:55:58 +00:00
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.IR memory (8),
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2017-10-29 22:09:54 +00:00
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.IR swap (8).
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.SH SOURCE
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.B /sys/src/9/port/devswap.c
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