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Diffstat (limited to 'sys-utils/zramctl.8')
| -rw-r--r-- | sys-utils/zramctl.8 | 158 |
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diff --git a/sys-utils/zramctl.8 b/sys-utils/zramctl.8 new file mode 100644 index 0000000..1d7e53d --- /dev/null +++ b/sys-utils/zramctl.8 @@ -0,0 +1,158 @@ +'\" t +.\" Title: zramctl +.\" Author: [see the "AUTHOR(S)" section] +.\" Generator: Asciidoctor 2.0.15 +.\" Date: 2022-05-11 +.\" Manual: System Administration +.\" Source: util-linux 2.38.1 +.\" Language: English +.\" +.TH "ZRAMCTL" "8" "2022-05-11" "util\-linux 2.38.1" "System Administration" +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.ss \n[.ss] 0 +.nh +.ad l +.de URL +\fI\\$2\fP <\\$1>\\$3 +.. +.als MTO URL +.if \n[.g] \{\ +. mso www.tmac +. am URL +. ad l +. . +. am MTO +. ad l +. . +. LINKSTYLE blue R < > +.\} +.SH "NAME" +zramctl \- set up and control zram devices +.SH "SYNOPSIS" +.sp +Get info: +.RS 4 +\fBzramctl\fP [options] +.RE +.sp +Reset zram: +.RS 4 +\fBzramctl\fP \fB\-r\fP \fIzramdev\fP... +.RE +.sp +Print name of first unused zram device: +.RS 4 +\fBzramctl\fP \fB\-f\fP +.RE +.sp +Set up a zram device: +.RS 4 +\fBzramctl\fP [\fB\-f\fP | \fIzramdev\fP] [\fB\-s\fP \fIsize\fP] [\fB\-t\fP \fInumber\fP] [\fB\-a\fP \fIalgorithm\fP] +.RE +.SH "DESCRIPTION" +.sp +\fBzramctl\fP is used to quickly set up zram device parameters, to reset zram devices, and to query the status of used zram devices. +.sp +If no option is given, all non\-zero size zram devices are shown. +.sp +Note that \fIzramdev\fP node specified on command line has to already exist. The command \fBzramctl\fP creates a new \fI/dev/zram<N>\fP nodes only when \fB\-\-find\fP option specified. It\(cqs possible (and common) that after system boot \fI/dev/zram<N>\fP nodes are not created yet. +.SH "OPTIONS" +.sp +\fB\-a\fP, \fB\-\-algorithm lzo\fP|\fBlz4\fP|\fBlz4hc\fP|\fBdeflate\fP|\fB842\fP|\fBzstd\fP +.RS 4 +Set the compression algorithm to be used for compressing data in the zram device. +.RE +.sp +\fB\-f\fP, \fB\-\-find\fP +.RS 4 +Find the first unused zram device. If a \fB\-\-size\fP argument is present, then initialize the device. +.RE +.sp +\fB\-n\fP, \fB\-\-noheadings\fP +.RS 4 +Do not print a header line in status output. +.RE +.sp +\fB\-o\fP, \fB\-\-output\fP \fIlist\fP +.RS 4 +Define the status output columns to be used. If no output arrangement is specified, then a default set is used. Use \fB\-\-help\fP to get a list of all supported columns. +.RE +.sp +\fB\-\-output\-all\fP +.RS 4 +Output all available columns. +.RE +.sp +\fB\-\-raw\fP +.RS 4 +Use the raw format for status output. +.RE +.sp +\fB\-r\fP, \fB\-\-reset\fP +.RS 4 +Reset the options of the specified zram device(s). Zram device settings can be changed only after a reset. +.RE +.sp +\fB\-s\fP, \fB\-\-size\fP \fIsize\fP +.RS 4 +Create a zram device of the specified \fIsize\fP. Zram devices are aligned to memory pages; when the requested \fIsize\fP is not a multiple of the page size, it will be rounded up to the next multiple. When not otherwise specified, the unit of the \fIsize\fP parameter is bytes. +.sp +The \fIsize\fP argument may be followed by the multiplicative suffixes KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB, ZiB and YiB (the "iB" is optional, e.g., "K" has the same meaning as "KiB") or the suffixes KB (=1000), MB (=1000*1000), and so on for GB, TB, PB, EB, ZB and YB. +.RE +.sp +\fB\-t\fP, \fB\-\-streams\fP \fInumber\fP +.RS 4 +Set the maximum number of compression streams that can be used for the device. The default is use all CPUs and one stream for kernels older than 4.6. +.RE +.sp +\fB\-h\fP, \fB\-\-help\fP +.RS 4 +Display help text and exit. +.RE +.sp +\fB\-V\fP, \fB\-\-version\fP +.RS 4 +Print version and exit. +.RE +.SH "EXIT STATUS" +.sp +\fBzramctl\fP returns 0 on success, nonzero on failure. +.SH "FILES" +.sp +\fI/dev/zram[0..N]\fP +.RS 4 +zram block devices +.RE +.SH "EXAMPLE" +.sp +The following commands set up a zram device with a size of one gigabyte and use it as swap device. +.sp +.if n .RS 4 +.nf +.fam C + # zramctl \-\-find \-\-size 1024M + /dev/zram0 + # mkswap /dev/zram0 + # swapon /dev/zram0 + ... + # swapoff /dev/zram0 + # zramctl \-\-reset /dev/zram0 +.fam +.fi +.if n .RE +.SH "AUTHORS" +.sp +.MTO "nefelim4ag\(atgmail.com" "Timofey Titovets" "," +.MTO "kzak\(atredhat.com" "Karel Zak" "" +.SH "SEE ALSO" +.sp +.URL "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin\-guide/blockdev/zram.rst" "Linux kernel documentation" "" +.SH "REPORTING BUGS" +.sp +For bug reports, use the issue tracker at \c +.URL "https://github.com/util\-linux/util\-linux/issues" "" "." +.SH "AVAILABILITY" +.sp +The \fBzramctl\fP command is part of the util\-linux package which can be downloaded from \c +.URL "https://www.kernel.org/pub/linux/utils/util\-linux/" "Linux Kernel Archive" "."
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