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SubjectRe: Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:
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On Tue, Oct 29, 2013 at 4:51 PM, Mark Wielaard <mjw@redhat.com> wrote:
> A nice user case to think about when designing this interface might be
> the java hotspot jvm (libjvm.so). It has SDT markers with the same name
> that might occur at multiple addresses depending on code path taken or
> compiler optimization. And there are multiple libjvm.so variants
> depending on whether the user uses the client or server VM. And users
> often have multiple major versions installed (both 1.6 and 1.7 are
> currently being shipped by some distros and can be installed in
> parallel).
>
> Normally a user that wants to monitor say the hotspot:gc__begin SDT
> probe wants to see that probe in whatever code path it happens and in
> whatever libjvm.so happens to be running (client or server and 1.6 or
> 1.7 version). But might still want to be able to specify a specific
> variant.

Agreed, it's an excellent use case.


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