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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | AUTHOR | SEE ALSO | AVAILABILITY | COLOPHON |
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LSMEM(1) User Commands LSMEM(1)
lsmem - list the ranges of available memory with their online status
lsmem [options]
The lsmem command lists the ranges of available memory with their
online status. The listed memory blocks correspond to the memory
block representation in sysfs. The command also shows the memory
block size and the amount of memory in online and offline state.
The default output compatible with original implementation from
s390-tools, but it's strongly recommended to avoid using default
outputs in your scripts. Always explicitly define expected columns
by using the --output option together with a columns list in
environments where a stable output is required.
The lsmem command lists a new memory range always when the current
memory block distinguish from the previous block by some output
column. This default behavior is possible to override by the --split
option (e.g. lsmem --split=ZONES). The special word "none" may be
used to ignore all differences between memory blocks and to create as
large as possible continuous ranges. The opposite semantic is --all
to list individual memory blocks.
Note that some output columns may provide inaccurate information if a
split policy forces lsmem to ignore diffrences in some attributes.
For example if you merge removable and non-removable memory blocks to
the one range than all the range will be marked as non-removable on
lsmem output.
Not all columns are supported on all systems. If an unsupported
column is specified, lsmem prints the column but does not provide any
data for it.
Use the --help option to see the columns description.
-a, --all
List each individual memory block, instead of combining memory
blocks with similar attributes.
-b, --bytes
Print the SIZE column in bytes rather than in a human-readable
format.
-h, --help
Display help text and exit.
-J, --json
Use JSON output format.
-n, --noheadings
Do not print a header line.
-o, --output list
Specify which output columns to print. Use --help to get a
list of all supported columns. The default list of columns
may be extended if list is specified in the format +list (e.g.
lsmem -o +NODE).
-P, --pairs
Produce output in the form of key="value" pairs. All
potentially unsafe characters are hex-escaped (\x<code>).
-r, --raw
Produce output in raw format. All potentially unsafe
characters are hex-escaped (\x<code>).
-S, --split list
Specify which columns (attributes) use to split memory blocks
to ranges. The supported columns are STATE, REMOVABLE, NODE
and ZONES, or "none". The another columns are silently
ignored. For more details see DESCRIPTION above.
-s, --sysroot directory
Gather memory data for a Linux instance other than the
instance from which the lsmem command is issued. The
specified directory is the system root of the Linux instance
to be inspected.
-V, --version
Display version information and exit.
--summary[=when]
This option controls summary lines output. The optional
argument when can be never, always or only. If the when
argument is omitted, it defaults to "only". The summary output
is suppresed for --raw, --pairs and --json.
lsmem was originally written by Gerald Schaefer for s390-tools in
Perl. The C version for util-linux was written by Clemens von Mann,
Heiko Carstens and Karel Zak.
chmem(8)
The lsmem command is part of the util-linux package and is available
from Linux Kernel Archive
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩.
This page is part of the util-linux (a random collection of Linux
utilities) project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2018-02-02. (At that time, the date of the most recent commit that
was found in the repository was 2018-02-01.) If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
util-linux October 2016 LSMEM(1)
Pages that refer to this page: chmem(8)
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