LSMEM(1) User Commands LSMEM(1)
NAME
lsmem - list the ranges of available memory with their online status
SYNOPSIS
lsmem [options]
DESCRIPTION
The lsmem command lists the ranges of available memory with their on-
line 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 out-
puts in your scripts. Always explicitly define expected columns by us-
ing 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 mem-
ory 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 in-
dividual memory blocks.
Note that some output columns may provide inaccurate information if a
split policy forces lsmem to ignore differences 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.
OPTIONS
-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).
--output-all
Output all available columns.
-P, --pairs
Produce output in the form of key="value" pairs. All poten-
tially 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 argu-
ment when can be never, always or only. If the when argument is
omitted, it defaults to "only". The summary output is suppressed
for --raw, --pairs and --json.
AUTHOR
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.
SEE ALSO
chmem(8)
AVAILABILITY
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/>.
util-linux October 2016 LSMEM(1)