# proc_pid_status - memory usage and status information - man(5) - [phpMan] [_proc_pid_status_(5)](https://www.chedong.com/phpMan.php/man/procpidstatus/5/markdown) File Formats Manual [_proc_pid_status_(5)](https://www.chedong.com/phpMan.php/man/procpidstatus/5/markdown) ## 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)](https://www.chedong.com/phpMan.php/man/umask/2/markdown). (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)](https://www.chedong.com/phpMan.php/man/gettid/2/markdown)). _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)](https://www.chedong.com/phpMan.php/man/mlock/2/markdown)). _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)](https://www.chedong.com/phpMan.php/man/tmpfs/5/markdown), 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)](https://www.chedong.com/phpMan.php/man/getrlimit/2/markdown)). _SigPnd_ _ShdPnd_ Mask (expressed in hexadecimal) of signals pending for thread and for process as a whole (see [**pthreads**(7)](https://www.chedong.com/phpMan.php/man/pthreads/7/markdown) and [**signal**(7)](https://www.chedong.com/phpMan.php/man/signal/7/markdown)). _SigBlk_ _SigIgn_ _SigCgt_ Masks (expressed in hexadecimal) indicating signals being blocked, ignored, and caught (see [**signal**(7)](https://www.chedong.com/phpMan.php/man/signal/7/markdown)). _CapInh_ _CapPrm_ _CapEff_ Masks (expressed in hexadecimal) of capabilities enabled in inheritable, per‐ mitted, and effective sets (see [**capabilities**(7)](https://www.chedong.com/phpMan.php/man/capabilities/7/markdown)). _CapBnd_ Capability bounding set, expressed in hexadecimal (since Linux 2.6.26, see **ca‐** [**pabilities**(7)](https://www.chedong.com/phpMan.php/man/pabilities/7/markdown)). _CapAmb_ Ambient capability set, expressed in hexadecimal (since Linux 4.3, see **capabil‐** [**ities**(7)](https://www.chedong.com/phpMan.php/man/ities/7/markdown)). _NoNewPrivs_ Value of the _no_new_privs_ bit (since Linux 4.10, see [**prctl**(2)](https://www.chedong.com/phpMan.php/man/prctl/2/markdown)). _Seccomp_ Seccomp mode of the process (since Linux 3.8, see [**seccomp**(2)](https://www.chedong.com/phpMan.php/man/seccomp/2/markdown)). 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)](https://www.chedong.com/phpMan.php/man/comp/2/markdown)). _Speculation_Store_Bypass_ Speculation flaw mitigation state (since Linux 4.17, see [**prctl**(2)](https://www.chedong.com/phpMan.php/man/prctl/2/markdown)). _Cpus_allowed_ Hexadecimal mask of CPUs on which this process may run (since Linux 2.6.24, see [**cpuset**(7)](https://www.chedong.com/phpMan.php/man/cpuset/7/markdown)). _Cpus_allowed_list_ Same as previous, but in "list format" (since Linux 2.6.26, see [**cpuset**(7)](https://www.chedong.com/phpMan.php/man/cpuset/7/markdown)). _Mems_allowed_ Mask of memory nodes allowed to this process (since Linux 2.6.24, see [**cpuset**(7)](https://www.chedong.com/phpMan.php/man/cpuset/7/markdown)). _Mems_allowed_list_ Same as previous, but in "list format" (since Linux 2.6.26, see [**cpuset**(7)](https://www.chedong.com/phpMan.php/man/cpuset/7/markdown)). _voluntary_ctxt_switches_ _nonvoluntary_ctxt_switches_ Number of voluntary and involuntary context switches (since Linux 2.6.23). ## SEE ALSO [**proc**(5)](https://www.chedong.com/phpMan.php/man/proc/5/markdown) Linux man-pages 6.7 2023-10-23 [_proc_pid_status_(5)](https://www.chedong.com/phpMan.php/man/procpidstatus/5/markdown)