On Wed, Dec 16, 2009 at 1:52 PM, Hillel (Sabba) Markowitz
<sabbahil...@gmail.com> wrote:
>
> As can be seen, if recursive code is used, the self->ts gets reset to
> timestamp with every entry, and the innermost exit causes a time to be
> calculated and the ts to be reset. The rest of the returns within the
> recursion will be ignored because of the conditional.
>
> I would like to know if someone has already done this before I try to
> reinvent the wheel or if there is a tool in the dtrace toolkit to do
> this already.
You'll need to keep an array of timestamps indexed on ustackdepth.
Something like this (it appears that ustackdepth on entry doesn't
actually match ustackdepth on return):
pid$target:*.so::entry
{
self->ts[probemod, probefunc, ustackdepth] = timestamp;
}
pid$target:*.so::return
/ self->ts[probemod, probefunc, ustackdepth + 1] /
{
@func_time[probemod, probefunc] = sum(timestamp -
self->ts[probemod, probefunc, ustackdepth + 1]);
self->ts[probemod, probefunc, ustackdepth + 1] = 0;
}
Chad
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