[Bug kprobes/2062] Return probes does not scale well on SMP box

["anil dot s dot keshavamurthy at intel dot com" <sourceware-bugzilla@sourceware.org>]

------- Additional Comments From anil dot s dot keshavamurthy at intel dot com  2006-04-18 20:38 -------
> why not just store data per cpu/core
Storing it in per cpu might not work here as in some cases the function enter 
might be called on one cpu and the by the time that function returns it could 
have migrated to a different cpu's and hence return is executed from different 
cpu. So we have to do global search for the return probe instance related to 
that perticular task and hence per cpu/core is not feasible.

However if we store the return probe instances in the task structure itself(by 
extending the task struct)then we can completly eliminate the locks for return 
probes and return probes can be made to run in parallel. We have to convince 
the linux community for extension of task struct.

-Anil


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http://sourceware.org/bugzilla/show_bug.cgi?id=2062

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