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 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 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 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 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/⟩.