Jean-Olivier Villemure wrote: > Hello, > > I'm currently working on the integration of Xenomai tracing in LTTng > (Linux Trace Toolkit Next Generation) and the event viewing in LTTV > (Linux Trace Toolkit Viewer). > > At this moment, I 'm tracing events about task handling, period and > soon, mutex and semaphore synchronization.
Wow, great news! > > Inserting traqcing points in Xenomai nucleus is not very difficult, my > main work is focus on the controlflow viewer module of LTTV. At this > moment, we can open a trace and view: > - Task state : init, started, running, suspended, overrunning (period > miss) > - Period timer tick for periodic task > - Textual information about the task (name, period, priority, birth) > - Mutex/semaphore owned by specific task > - Soon task waiting on mutex/semaphore > > Look at the screenshot to have a better idea. > > The next step will be to generate some statistics, for this step I will > need your help. As Xenomai users, which kind of stats would you want to > compute? - CPU usage (see /proc/xenomai/stat for average numbers, but we should now be able to precisely calculate them for a specific period) - Waiting times after activation (maybe one can define deadlines later and verify them) - Number of preemptions per second or whatever while a task is runnable - Number of blockades a task faces due to unavailable resources (mutexes, semaphores, etc.) ...just to through some first ideas in. > > After that, I'll study the possibilities of simulating an execution > trace from an existing trace by modifying some parameters (period > length, ...) > > Any ideas are welcome! So you have an integrated I-pipe+LTTng patch which is able to record events under any context and push them to Linux non-RT user-space, right? How does this work, what impact does it have (also compared to the I-pipe tracer, which is not light-weight)? And, most important, when will we be able to see some code (ipipe add-on patch)? Would be good to assess how this could be integrated on the long term into I-pipe/Xenomai, at least until required LTTng parts become mainstream. Jan
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