It's also used in top, systat, and tty status (^T).
Index: sched_bsd.c =================================================================== RCS file: /cvs/src/sys/kern/sched_bsd.c,v retrieving revision 1.42 diff -u -p -r1.42 sched_bsd.c --- sched_bsd.c 8 Nov 2015 20:45:57 -0000 1.42 +++ sched_bsd.c 7 Mar 2016 17:44:30 -0000 @@ -233,7 +233,7 @@ schedcpu(void *arg) continue; SCHED_LOCK(s); /* - * p_pctcpu is only for ps. + * p_pctcpu is only for diagnostic tools such as ps. */ #if (FSHIFT >= CCPU_SHIFT) p->p_pctcpu += (phz == 100)? -- Michal Mazurek