topic Re: docs on proc table in Operating System - Linux

docs on proc table

K.C. Chan — Tue, 11 Oct 2005 22:02:33 GMT

all,
here's a snippet of /proc//stat:
945 (ndiswrapwq) S 5 0 0 0 -1 41024 0 0 0 0 0 394 0 0 10 -5 1 0 1184 0 0 4294967295 0 0 0 0 0 0 2147483647 65536 0 3222508453 0 0 17 0 0 0

Could some shed some light on what each col means (map to). I could make out some of it but not all. fist col is pid, second is command, 3rd col is status of process. The rest I am not sure. I am interested in time process start, how much cpu rutime, etc...

Thanks.

Re: docs on proc table

Gopi Sekar — Wed, 12 Oct 2005 03:24:09 GMT

check 'man 5 proc', it has detailed information on stat and other files in /proc/ folder

Hope this helps,
Gopi

Re: docs on proc table

Matti_Kurkela — Wed, 12 Oct 2005 03:38:50 GMT

You might want to check out Linux kernel source code, linux-2.6.13.2/fs/proc/array.c, function do_task_stat().

The list of fields (in a huge sprintf() call) is defined as:

task->pid,
tcomm,
state,
ppid,
pgid,
sid,
tty_nr,
tty_pgrp,
task->flags,
min_flt,
cmin_flt,
maj_flt,
cmaj_flt,
cputime_to_clock_t(utime),
cputime_to_clock_t(stime),
cputime_to_clock_t(cutime),
cputime_to_clock_t(cstime),
priority,
nice,
num_threads,
jiffies_to_clock_t(it_real_value),
start_time,
vsize,
mm ? get_mm_counter(mm, rss) : 0, /* you might want to shift this left 3 */
rsslim,
mm ? mm->start_code : 0,
mm ? mm->end_code : 0,
mm ? mm->start_stack : 0,
esp,
eip,
/* The signal information here is obsolete.
* It must be decimal for Linux 2.0 compatibility.
* Use /proc/#/status for real-time signals.
*/
task->pending.signal.sig[0] & 0x7fffffffUL,
task->blocked.sig[0] & 0x7fffffffUL,
sigign .sig[0] & 0x7fffffffUL,
sigcatch .sig[0] & 0x7fffffffUL,
wchan,
0UL,
0UL,
task->exit_signal,
task_cpu(task),
task->rt_priority,
task->policy);

If you're making your own program to decipher /proc entries, you should definitely check out libproc (a part of the procps package, source code at http://rlove.org/procps/). If there is something you can use, you might achieve compatibility across major kernel versions with just keeping libproc up to date, if I'm not mistaken.

Re: docs on proc table

K.C. Chan — Wed, 12 Oct 2005 07:38:37 GMT

k, i got that infor. But not what is jiffie; according to the man page it is 1/100th of a second. Should I divide the stime by 1/100th of a second to get the result in second? Thanks.