On 6/17/15 17:21 , Priyank Sanghavi wrote:
> Hello,
>
> I am currently working on dtrace on free-bsd. What I want to do is put a
> probe on uma_zalloc function and quantize its arguments. But along with that
> I want to keep a condition to quantize ( or record the readings) only if the
> stack of that uma_zalloc has a function ( foo ) in it. —— This means,
> consider the readings of uma_zalloc only if it has come from the function
> foo.
>
> Is there a condition that can do that work?
Just use a thread local variable that tracks when you enter the function
you care about and removes it when you return. eg. if you had a function
called foobar:
fbt::foobar:entry
{
self->t = 1;
}
fbt::foobar:return
{
self->t = 0;
}
Then you can use that as a predicate on an enabling of uma_zalloc.
Robert
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