LinuxCon Japan 2012 | Presentations

Tracing Across Host OS and Guest OSs

We introduce "Integrated tracing" that enables to trace a host OS and guest OSs transparently. This technology based on IVRing that is a ring-buffer allows copy-less data communication between a host OS and guest OSs. In the virtualized environment, it was too difficult to find the cause of failures. We had to analyze huge trace-data of all guest OSs and a host OS, because a guest behavior can be affected by other guests. In this case, it is difficult to find the relevance to the failure and its causes. Moreover, since each guest OS has unique time-stamp, it is impossible to merge without time-stamp correction. This presentation shows that how the integrated tracing correct time-stamps and visualize tracing data to help to clarify the relevance to the failure and its causes about I/O.

Akihiro Nagai, Hitachi

Akihiro Nagai is a Software Engineer at Hitachi Ltd. in 2009, he researches tracing technologies.