On Oct 2, 2009, at 2:36 PM, Angelo Rajadurai wrote:
You may want to look at speculative tracing. This designed just for
this purpose
I'm a bit stumped, though. Consider this script below. I would like to
print statistics when the timer fires but it looks like I cannot have
commit in that clause since I get errors like
dtrace: failed to compile script reflow-timer.d: line 32: data-
recording actions may not follow commit( )
and
dtrace: failed to compile script reflow-timer.d: line 31: commit( )
may not follow data-recording action(s)
Can I have my cake and eat it too? Do I have to put the printing in a
separate script?
Thanks, Joel
---
mozilla$target:::reflow-timer-init
{
self->init = timestamp;
self->spec = speculation();
speculate(self->spec);
printf(">>> reflow timer initialized at %u to fire in %ums\n", self-
>init, arg0);
}
pid$target:::entry
/self->spec/
{
speculate(self->spec);
printf("%s\n", probefunc);
}
mozilla$target:::reflow-timer-cancel
/self->spec/
{
discard(self->spec);
self->spec = 0;
printf(">>> reflow timer cancelled\n");
}
mozilla$target:::reflow-timer-fire
/self->spec/
{
self->start = timestamp;
self->elapsed = self->start - self->init;
printf(">>> reflow timer fired at %u, after %u.%06ums\n",
self->start, self->elapsed / 1000000, self->elapsed % 1000000);
commit(self->spec);
self->spec = 0;
}
---
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