Section (1) lsmem
lsmem — list the ranges of available memory with their online status
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_zsingle_quotesz_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
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
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
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.
option to see the columns description.
List each individual memory block, instead of combining memory blocks with similar attributes.
Print the SIZE column in bytes rather than in a human-readable format.
Display help text and exit.
Use JSON output format.
Do not print a header line.
Specify which output columns to print. Use
−−helpto 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 available columns.
Produce output in the form of key=value pairs. All potentially unsafe characters are hex-escaped (x<code>).
Produce output in raw format. All potentially unsafe characters are hex-escaped (x<code>).
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.
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.
Display version information and exit.
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 suppressed for
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.
The lsmem command is part of the util-linux package and is available from Linux Kernel Archive