Hello, I am looking for some tool/kernel machanism that enables me to track every schedule change on the CFS scheduler of the RT-kernel for some period of time. Thus a tool that gives me an overview after some time which task got "scheduled in/out" at "which timestamp" and at "which CPU". ( I need the raw data) In a far past (on Montavista kernels) I used LTT for this to log for some time with only the SCHED_CHANGE filter and text output. But, I cannot find any LTT(ng) support for any RT-kernel, and support for the new CFS (like in 2.6.22.1-rt4) is even harder. So I was wondering if anybody knows some tool/kernel mechanism which can do this? If not, I will build a kernel extension for it myself (new extension to 'latency_trace' ?) In that case can anybody with in depth CFS scheduler knowledge please point me which hooks are safe to use for this? I need it to get a detailed insight in my RT-system with its RT and non-RT applications. Thus to know when a certain task gets scheduled (and to calculate its per thread min/max/avg latencies), which task preempts another task, and to get a complete overview of what the RT system (and scheduler) is doing during time etc. Kind Regards, Remy Böhmer - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
