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 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)