Workaround for Linux Perf Probes issue for Oracle Tracing

As explained in my previous post there is some issues with uprobes and the recent kernel/oracle version.Based on the workaround that i described i will show in  this short blog post how we can put a probe point on oracle function using Linux Perf. Sadly i haven’t figured out a way to do that using systemtap (Special thanks to Frank Ch. Eigler for his help)

Test oracle 12.2.0.1/OEL6/UEK4

This example is based on Luca Canali Post Linux Perf Probes for Oracle Tracing

Tracing pmon  wait events using perf :

Capture 01

Error !

Applying the workaround (tracing the next instruction : kskthewt+2)

perf probe -x oracle  kskthewt+2 timestamp=%di event=%si

Capture 02

Perfect it’s working !

Let’s inspect the code :

Capture 03

Good that’s what we wanted !

That’s it 😀

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