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Talk Details

Speaker Name Vamsi Krishna S
Company IBM
Talk Title Debugging with Dynamic Probes
Track /dev/system
Class Advance
Scope Technical
Synopsis This talk covers rationale behind IBM's Dynamic Probes, touches its implementation (how does it work) briefly and explains its usage. More details about DProbes can be found at http://oss.software.ibm.com/developerworks/opensource/linux/projects/dprobes/ DProbes is a generic and pervasive system debugging facility that will operate under the most extreme software conditions with minimal system disruption. It permits debugging of some of the most difficult types of software problem especially those encountered in a production environment that will not readily re-create. It is also an invaluable aid for the developer who has to debug parts of the operating system inaccessible to other technologies. The core of DProbes comprises a fully automated breakpoint or "probepoint" mechanism (also referred to as a tracepoint in the context of dynamic tracing). Probepoints may be inserted anywhere within system and user space code. They are global by definition, that is they are defined relative to a module not to a storage address or process. Each probepoint has an associated Reverse Polish Notation program (RPN) that is interpreted when the probe fires. The RPN instructions allow memory and CPU registers to be examined and altered using conditional logic.
Points What is Dynamic Probes Dprobes components What is a probepoint probepoint specification RPN interpreter RPN instruction categories RPN invoked external facilities Example program Dprobes application What's next
Speaker Profile I have done B.E.(Hons) in Electrical and Electronics from BITS, filesystem mainly debugging and fixing customer-reported problems/defects. In the last two years, I have been working on developing debugging tools in the Linux Kernel. Pilani. I have been working for IBM since 1995, mainly in the areas of Operating Systems. I have worked on the OS/2 kernel and
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