[Bug runtime/10013] Support ENABLED sdt probe macro

[fche at redhat dot com]

------- Additional Comments From fche at redhat dot com  2009-04-05 21:56 -------
> Maybe we can teach uprobes to replace with a specific move/assignment
> instruction instead of a trap instruction.

This optimization is the same as in the "move immediate" kernel markers.
However, it is not a *substitute* for a trap.  It is only a substitute
for a condition evaluation.

> Then instead of with a normal STAP_PROBE replacing a "nop" with "int3", you
> would replace the "mov $0x0, %somereg" with "mov $0x1, %somereg".

You still need some way to enter the kernel.


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http://sourceware.org/bugzilla/show_bug.cgi?id=10013

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