Name
/proc/pid/status - memory usage and status informationDescription
/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 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 inaccurate; 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 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 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 capabilities(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 seccomp(2)). 0 means SECCOMP_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 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)