man > proc_pid_status(5)

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 successively 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  name‐
                     spaces 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 be‐
                     cause 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 inaccurate; see /proc/pid/statm above.

              RssAnon
                     Size of resident anonymous memory.  (since Linux 4.5).  This value  is  inaccu‐
                     rate; 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 mappings).  (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; removed 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 information 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 relate to  queued  signals
                     for the real user ID of this process.  The first of these is the number of cur‐
                     rently  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,  per‐
                     mitted, and effective sets (see capabilities(7)).

              CapBnd Capability  bounding set, expressed in hexadecimal (since Linux 2.6.26, see ca‐
                     pabilities(7)).

              CapAmb Ambient capability set, expressed in hexadecimal (since Linux 4.3, see capabil‐
                     ities(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 seccomp(2)).   0  means  SEC‐
                     COMP_MODE_DISABLED;  1  means SECCOMP_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 sec‐
                     comp(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)