Re: [PATCH v4 2/3] Support for perf to probe into SDT markers:

From: Srikar Dronamraju
Date: Mon Oct 28 2013 - 10:26:47 EST

* Pekka Enberg <penberg@xxxxxx> [2013-10-28 14:42:13]:

> >So, it still needs a concrete binary path to list or, we should
> >support a syntax which specify actual binary, as like as below.
> >
> > perf probe 'my_event=%libc:setjmp@/lib64/'
> >
> >And perf list may show the marker as in same syntax (for copy&paste).
> >
> ># perf list --sdt
> > %libc:setjmp@/lib64/
> > ...
> >
> >Note that we need '%' to separate namespace :(, since user can define
> >any marker(provider) name in their binary...
> Sure, you need to support that sort of 'fully qualified name' for
> duplicate symbols but the default 'libc:setjmp' should still point
> to system libc.

But what if a system has both 32 bit libc and 64 bit libc?
Wont we could end up with 2 libc:setjmp?
Should we give some more intelligence into perf to choose the 64 bit
libc over 32 bit one?

Thanks and Regards
Srikar Dronamraju

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