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% Registration Locating system problems using dynamic
% instrumentation
% Vara Prasad (varap@us.ibm.com)
It is often difficult to diagnose complex
problems without multiple rebuilds and
reboots. Even in a simple setup, the problem
can touch various layers of the application
and operating system. Diagnosis is even more
difficult in complex, multi-tiered systems. As
Linux is deployed in these environments, it is
becoming more important to have facilities to
locate and identify such problems.
Using the kprobes infrastructure, SystemTAP is
being developed to dynamically instrument the
kernel and user applications. SystemTAP
instrumentation incurs low overhead when
enabled, and zero overhead when disabled.
SystemTAP provides facilities to define
instrumentation points in a high-level
language, and to aggregate and analyze the
instrumentation data. Details of the SystemTAP
architecture and implementation are presented,
along with examples of solving problems in the
production environments.
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