http://man7.org/linux/man-pages/man5/proc.5.html

/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

                  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

                  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.

              * 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

                reading process, 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 NSt‐

                gid.  (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(3)).

              * 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").

              * VmRSS: Resident set size.  Note that the value here is the

                sum of RssAnon, RssFile, and RssShmem.

              * RssAnon: Size of resident anonymous memory.  (since Linux

                4.5).

              * RssFile: Size of resident file mappings.  (since Linux 4.5).

              * 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 seg‐

                ments.

              * VmLib: Shared library code size.

              * VmPTE: Page table entries size (since Linux 2.6.10).

              * VmPMD: Size of second-level page tables (since Linux 4.0).

              * VmSwap: Swapped-out virtual memory size by anonymous private

                pages; shmem swap usage is not included (since Linux

                2.6.34).

              * HugetlbPages: Size of hugetlb memory portions.  (since Linux

                4.4).

              * 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: Number of signals pending for thread and for

                process as a whole (see pthreads(7) and signal(7)).

              * SigBlk, SigIgn, SigCgt: Masks indicating signals being

                blocked, ignored, and caught (see signal(7)).

              * CapInh, CapPrm, CapEff: Masks of capabilities enabled in

                inheritable, permitted, and effective sets (see

                capabilities(7)).

              * CapBnd: Capability Bounding set (since Linux 2.6.26, see

                capabilities(7)).

              * CapAmb: Ambient capability set (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 SEC‐

                COMP_MODE_STRICT; 2 means SECCOMP_MODE_FILTER.  This field

                is provided only if the kernel was built with the CON‐

                FIG_SECCOMP kernel configuration option enabled.

              * Cpus_allowed: 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).

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