On Tue, Jul 21, 2009 at 12:37 PM, Matt Ingenthron<mingenth...@acm.org> wrote:
>> To be more particular, in order to get the types from
>> the provider, you must
>> use the args[] array, not the arg? variables. Try
>> doing:
>>
>> printf("key is %s, length is %d\n", copyinstr(arg1),
>> , args[3]);
>
> The DTrace script doesn't seem to be correct in that case. I get the
> following:
>
> $ pfexec ./keysflowing.d
> dtrace: failed to compile script ./keysflowing.d: line 11: args[ ] may not be
> referenced because probe description :memcached*::command-get matches an
> unstable set of probes
>
> 7 memcached*::command-get
> 8 / (signed int) arg3 != -1 /
> 9 {
> 10 printf("get %s, FOUND KEY\n", copyinstr(arg1));
> 11 printf("another approach %d", args[3]);
> 12 }
>
> What does it take to make it stable? :) Here is the probe definition.
>
You're trying to use the args[] array with a USDT provider. DTrace
doesn't (yet) have the ability to pull type information out of
processes, so you don't get the args[] array for anything but
kernel-based probes. (The kernel contains CTF information that it
uses to map types to arguments.)
Chad
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