Messages in this thread | | | From | anton wilson <> | Subject | do_gettimeofday vs. rdtsc in the scheduler | Date | Mon, 9 Sep 2002 18:21:57 -0400 |
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I'm writing a patch for the scheduler that allows normal processes to run occasionally even though real-time processes completely dominate the CPU. In order to do this the way I want to for a specific real-time application, I need to keep track of the times that the schedule(void) function gets called. This time is then used to calculate the time difference between when a normal process was run last and the current time. I was trying to avoid do_gettimeofday because of the overhead, but now I'm wondering if rdtsc on an SMP machine may mess up my readings because the TSC from two different processors may be read. Am I right in assuming this? Secondly, any good suggestions on how to proceed with my patch?
Thanks,
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