From: "Stone, Joshua I" <joshua.i.stone@intel.com>
To: Roland McGrath <roland@redhat.com>,
"systemtap@sources.redhat.com" <systemtap@sources.redhat.com>
Subject: RE: $foo in probe predicates
Date: Wed, 07 Jan 2009 22:19:00 -0000 [thread overview]
Message-ID: <60BA3EDE80604C4BAEE4AAF7FF714D18CC06F66B@orsmsx504.amr.corp.intel.com> (raw)
In-Reply-To: <20090107220903.9BB49FC305@magilla.sf.frob.com>
Roland McGrath wrote:
> [...]
> AFAICT this makes it impossible to do:
>
> probe foo.bar = kernel.function("blah") if ($arg == 1) { argstr=... }
> probe foo.baz = kernel.function("blah") if ($arg == 2) { argstr=... }
>
> and I don't know how else I could get the same effect. That is, so:
>
> probe foo.bar { print... }
>
> does not print on $arg!=1 cases, with the knowedlge about $arg and its
> values being hidden in the tapset.
You can achieve this with "next", which is like a return statement for probes.
probe foo.bar = kernel.function("blah") { if ($arg != 1) next; argstr=... }
probe foo.baz = kernel.function("blah") { if ($arg != 2) next; argstr=... }
Josh
next prev parent reply other threads:[~2009-01-07 22:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-07 22:09 Roland McGrath
2009-01-07 22:19 ` Stone, Joshua I [this message]
2009-01-07 23:54 ` Frank Ch. Eigler
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