proc_pid_status(5) File Formats Manual proc_pid_status(5)
NAME
/proc/pid/status - memory usage and status information
DESCRIPTION
/proc/pid/status
Provides much of the information in /proc/pid/stat and
/proc/pid/statm in a format that's easier for humans to parse.
Here's an example:
$ cat /proc/$$/status
Name: bash
Umask: 0022
State: S (sleeping)
Tgid: 17248
Ngid: 0
Pid: 17248
PPid: 17200
TracerPid: 0
Uid: 1000 1000 1000 1000
Gid: 100 100 100 100
FDSize: 256
Groups: 16 33 100
NStgid: 17248
NSpid: 17248
NSpgid: 17248
NSsid: 17200
VmPeak: 131168 kB
VmSize: 131168 kB
VmLck: 0 kB
VmPin: 0 kB
VmHWM: 13484 kB
VmRSS: 13484 kB
RssAnon: 10264 kB
RssFile: 3220 kB
RssShmem: 0 kB
VmData: 10332 kB
VmStk: 136 kB
VmExe: 992 kB
VmLib: 2104 kB
VmPTE: 76 kB
VmPMD: 12 kB
VmSwap: 0 kB
HugetlbPages: 0 kB # 4.4
CoreDumping: 0 # 4.15
Threads: 1
SigQ: 0/3067
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000010000
SigIgn: 0000000000384004
SigCgt: 000000004b813efb
CapInh: 0000000000000000
CapPrm: 0000000000000000
CapEff: 0000000000000000
CapBnd: ffffffffffffffff
CapAmb: 0000000000000000
NoNewPrivs: 0
Seccomp: 0
Seccomp_filters: 0
Speculation_Store_Bypass: vulnerable
Cpus_allowed: 00000001
Cpus_allowed_list: 0
Mems_allowed: 1
Mems_allowed_list: 0
voluntary_ctxt_switches: 150
nonvoluntary_ctxt_switches: 545
The fields are as follows:
Name Command run by this process. Strings longer than
TASK_COMM_LEN (16) characters (including the terminating
null byte) are silently truncated.
Umask Process umask, expressed in octal with a leading zero;
see umask(2). (Since Linux 4.7.)
State Current state of the process. One of "R (running)", "S
(sleeping)", "D (disk sleep)", "T (stopped)", "t (tracing
stop)", "Z (zombie)", or "X (dead)".
Tgid Thread group ID (i.e., Process ID).
Ngid NUMA group ID (0 if none; since Linux 3.13).
Pid Thread ID (see gettid(2)).
PPid PID of parent process.
TracerPid
PID of process tracing this process (0 if not being
traced).
Uid
Gid Real, effective, saved set, and filesystem UIDs (GIDs).
FDSize Number of file descriptor slots currently allocated.
Groups Supplementary group list.
NStgid Thread group ID (i.e., PID) in each of the PID namespaces
of which pid is a member. The leftmost entry shows the
value with respect to the PID namespace of the process
that mounted this procfs (or the root namespace if
mounted by the kernel), followed by the value in succes-
sively nested inner namespaces. (Since Linux 4.1.)
NSpid Thread ID in each of the PID namespaces of which pid is a
member. The fields are ordered as for NStgid. (Since
Linux 4.1.)
NSpgid Process group ID in each of the PID namespaces of which
pid is a member. The fields are ordered as for NStgid.
(Since Linux 4.1.)
NSsid descendant namespace session ID hierarchy Session ID in
each of the PID namespaces of which pid is a member. The
fields are ordered as for NStgid. (Since Linux 4.1.)
VmPeak Peak virtual memory size.
VmSize Virtual memory size.
VmLck Locked memory size (see mlock(2)).
VmPin Pinned memory size (since Linux 3.2). These are pages
that can't be moved because something needs to directly
access physical memory.
VmHWM Peak resident set size ("high water mark"). This value
is inaccurate; see /proc/pid/statm above.
VmRSS Resident set size. Note that the value here is the sum
of RssAnon, RssFile, and RssShmem. This value is inaccu-
rate; see /proc/pid/statm above.
RssAnon
Size of resident anonymous memory. (since Linux 4.5).
This value is inaccurate; see /proc/pid/statm above.
RssFile
Size of resident file mappings. (since Linux 4.5). This
value is inaccurate; see /proc/pid/statm above.
RssShmem
Size of resident shared memory (includes System V shared
memory, mappings from tmpfs(5), and shared anonymous map-
pings). (since Linux 4.5).
VmData
VmStk
VmExe Size of data, stack, and text segments. This value is
inaccurate; see /proc/pid/statm above.
VmLib Shared library code size.
VmPTE Page table entries size (since Linux 2.6.10).
VmPMD Size of second-level page tables (added in Linux 4.0; re-
moved in Linux 4.15).
VmSwap Swapped-out virtual memory size by anonymous private
pages; shmem swap usage is not included (since Linux
2.6.34). This value is inaccurate; see /proc/pid/statm
above.
HugetlbPages
Size of hugetlb memory portions (since Linux 4.4).
CoreDumping
Contains the value 1 if the process is currently dumping
core, and 0 if it is not (since Linux 4.15). This infor-
mation can be used by a monitoring process to avoid
killing a process that is currently dumping core, which
could result in a corrupted core dump file.
Threads
Number of threads in process containing this thread.
SigQ This field contains two slash-separated numbers that re-
late to queued signals for the real user ID of this
process. The first of these is the number of currently
queued signals for this real user ID, and the second is
the resource limit on the number of queued signals for
this process (see the description of RLIMIT_SIGPENDING in
getrlimit(2)).
SigPnd
ShdPnd Mask (expressed in hexadecimal) of signals pending for
thread and for process as a whole (see pthreads(7) and
signal(7)).
SigBlk
SigIgn
SigCgt Masks (expressed in hexadecimal) indicating signals being
blocked, ignored, and caught (see signal(7)).
CapInh
CapPrm
CapEff Masks (expressed in hexadecimal) of capabilities enabled
in inheritable, permitted, and effective sets (see capa-
bilities(7)).
CapBnd Capability bounding set, expressed in hexadecimal (since
Linux 2.6.26, see capabilities(7)).
CapAmb Ambient capability set, expressed in hexadecimal (since
Linux 4.3, see capabilities(7)).
NoNewPrivs
Value of the no_new_privs bit (since Linux 4.10, see
prctl(2)).
Seccomp
Seccomp mode of the process (since Linux 3.8, see sec-
comp(2)). 0 means SECCOMP_MODE_DISABLED; 1 means SEC-
COMP_MODE_STRICT; 2 means SECCOMP_MODE_FILTER. This
field is provided only if the kernel was built with the
CONFIG_SECCOMP kernel configuration option enabled.
Seccomp_filters
Number of seccomp filters attached to the process (since
Linux 5.9, see seccomp(2)).
Speculation_Store_Bypass
Speculation flaw mitigation state (since Linux 4.17, see
prctl(2)).
Cpus_allowed
Hexadecimal mask of CPUs on which this process may run
(since Linux 2.6.24, see cpuset(7)).
Cpus_allowed_list
Same as previous, but in "list format" (since Linux
2.6.26, see cpuset(7)).
Mems_allowed
Mask of memory nodes allowed to this process (since Linux
2.6.24, see cpuset(7)).
Mems_allowed_list
Same as previous, but in "list format" (since Linux
2.6.26, see cpuset(7)).
voluntary_ctxt_switches
nonvoluntary_ctxt_switches
Number of voluntary and involuntary context switches
(since Linux 2.6.23).
SEE ALSO
proc(5)
Linux man-pages 6.7 2023-10-23 proc_pid_status(5)
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