I understand people wanting to write their own performance tools, but people
who do this also need to understand that doing so will likely tie them to the
same constraints Apple has with regard to using SPIs and unstable interfaces.
What I need to do is the capability, while a process is running, is to
determine the total CPU time used by that process and any of its children,
_while the children are still running_. Obviously I can easily determine
the CPU time used by each child while it is running by summing up the
thread times and the terminated thread times, but there does not appear to
be a way to determine, for each still-running child, what the CPU time
used by that child's own terminated children is. In short, I need to
calculate the total CPU used by a process while it is running, including
all children and children of children (and so on), both terminated and
still running. This is critical for my application. Is there any way to do
this at all? I don't care if the method is version specific or not.
On Tiger, I do a sysctl() to get the kinfo_proc structure for all
processes of interest, and use a kvm_read(kinfo_proc.kp_eproc.e_paddr) to
get the p_stats structure of interest. This doesn't appear to be possible
anymore on Leopard, and from what I read, may not point to valid data even
if I could get at it.
Steve
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