On 04/11/2016 06:17 PM, Tejun Heo wrote:
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.
I have updated my patch to use percpu_counter instead. Thanks for all
the comments and review so far.
Cheers,
Longman
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