pid and execname mismatches

[tonyg362 <tonyg3622@yahoo.com>]

I'm trying to collect the pids and execnames of every process when it enters
the scheduler. The problem is that it seems as though the pid of the process
I use for the -c option always gives me the execname of the stapio process.
I thought maybe there was a problem with looking at the incorrect
task_struct because I am inside the scheduler, so I got this info directly
from the prev task_struct using context variables. e.g.

global pidlist

probe kernel.statement("schedule@kernel/sched.c:line#") {
    ppid = $prev->tgid
    name = kernel_string($prev->comm)

    if (!([ppid] in pidlist))
        pidlist[ppid] = name
}

probe end {
    foreach ([pid] in pidlist)
        printf("%d:%s\n", pid, pidlist[pid])
}

However, if I just hook into system calls and do a similar thing the pids
and execnames match up correctly. Am I doing something wrong?
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