when trying to improve top I was looking into ps's output when using option -S
and found with the help of alexh that the numbers reported back or not what is
described in man page:
-S : Change the way the process time is calculated by summing all exited
children to their parent process
This seems due to the fact that for summing up childrens cpu time
kinfo_proc.kp_cru is used in ps/print.c :
443 if (sumrusage) {
444 secs += KI_PROC(k, cru).ru_utime.tv_sec +
445 KI_PROC(k, cru).ru_stime.tv_sec;
446 psecs += KI_PROC(k, cru).ru_utime.tv_usec +
447 KI_PROC(k, cru).ru_stime.tv_usec;
448 }
scanning through DF sources in http://grok.x12.su gives me the impression that
kinfo_proc.kp_cru is not filled anywhere.
Other BSDs use similar approach for ps -S (fbsd: ki_childtime, obsd:
p_uctime_sec), but these contain actual data (fbsd: kern_proc.c,obsd:
kvm_proc.c).
So the question is, is this a ps bug and we should remove option -S (or add
note that this doesn't work on DF) or should we actually will kp_cru with
meaningful data?
Jan
___________________________________________________________
Preisknaller: WEB.DE DSL Flatrate für nur 16,99 Euro/mtl.!
http://produkte.web.de/go/02/
