Man page - proc_pid_statm(5)

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Manual

proc_pid_statm

NAME
DESCRIPTION
SEE ALSO

NAME

/proc/pid/statm - memory usage information

DESCRIPTION

/proc/ pid /statm

Provides information about memory usage, measured in pages. The columns are:

size (1) total program size
(same as VmSize in /proc/ pid /status )
resident (2) resident set size
(inaccurate; same as VmRSS in /proc/ pid /status )
shared (3) number of resident shared pages
(i.e., backed by a file)
(inaccurate; same as RssFile+RssShmem in
/proc/ pid /status )
text (4) text (code)
lib (5) library (unused since Linux 2.6; always 0)
data (6) data + stack
dt (7) dirty pages (unused since Linux 2.6; always 0)

Some of these values are inaccurate because of a kernel-internal scalability optimization. If accurate values are required, use /proc/ pid /smaps or /proc/ pid /smaps_rollup instead, which are much slower but provide accurate, detailed information.