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2014-04-20 - 14:03

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13th Real-Time Linux Workshop from October 20 to 22 at the Faculty of Electrical Engineering, Czech Technical University in Prague

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On migrate_disable() and latencies

Paul E. McKenney, IBM Linux Technology Center

With the 3.0 release, the -rt patchset introduced migrate_disable() to permit better handling of per-CPU variables and preempt_disable() and local_bh_disable() regions. However, there is some reason to believe that this approach might defeat load balancing and therefore reduce utilization, thereby increasing the response times for non-highest-priority tasks. This talk will look at a mathematical model of migration disabling to quantify this effect, and possibly put forward ways of ameliorating it.