Hello, Waiman. On Fri, Apr 08, 2016 at 02:45:38PM -0400, Waiman Long wrote: > The percpu_stats construct allows minimal overhead in maintaining statistics > counts. The percpu_counter construct, on the other hand, has a higher > performance overhead and a bit more complex to set up and tear down when
If you're referring to the preemption on/off, as I wrote before, we'll probably be able to improve that with this_cpu_add_return so that the only extra overhead is an easily predictable branch which is extremely cheap. It's better to improve common constructs anyway. > more than one statistics counts are needed. In fact, my first draft of the And yeah, it can be cumbersome to set up and tear down multiple percpu_counters. If there are enough consumers, we can extend percpu_counter to handle multiple counters, right? Thanks. -- tejun
