The /proc/<PID>/stat file contains detailed information about the process itself. Its fields are explained here:
| Field | Content |
|---|---|
| pid | Process id. |
| tcomm | Filename of the executable. |
| state | State (R is running, S is sleeping, D is sleeping in an uninterruptible wait, Z is zombie, T is traced or stopped). |
| ppid | Process id of the parent process. |
| pgrp | pgrp of the process. |
| sid | Session id. |
| tty_nr | tty the process uses. |
| tty_pgrp | pgrp of the tty. |
| flags | Task flags. |
| min_flt | Number of minor faults. |
| cmin_flt | Number of minor faults with child's. |
| maj_flt | Number of major faults. |
| cmaj_flt | Number of major faults with child's. |
| utime | User mode jiffies. |
| stime | Kernel mode jiffies. |
| cutime | User mode jiffies with child's. |
| cstime | Kernel mode jiffies with child's. |
| priority | Priority level. |
| nice | Nice level. |
| num_threads | Number of threads. |
| it_real_value | Obsolete, always 0. |
| start_time | Time the process started after system boot. |
| vsize | Virtual memory size. |
| rss | Resident set memory size. |
| rsslim | Current limit in bytes on the rss. |
| start_code | Address above which program text can run. |
| end_code | Address below which program text can run. |
| start_stack | Address of the start of the stack. |
| esp | Current value of ESP. |
| eip | Current value of EIP. |
| pending | Bitmap of pending signals. |
| blocked | Bitmap of blocked signals. |
| sigign | Bitmap of ignored signals. |
| sigcatch | Bitmap of catched signals. |
| wchan | Address where process went to sleep. |
| 0 | Place holder. |
| 0 | Place holder. |
| exit_signal | Signal to send to parent thread on exit. |
| task_cpu | Which CPU the task is scheduled on. |
| rt_priority | Realtime priority. |
| policy | Scheduling policy (man sched_setscheduler). |
| blkio_ticks | Time spent waiting for block IO. |
| gtime | Guest time of the task in jiffies. |
| cgtime | Guest time of the task children in jiffies. |