On Mon, 2013-05-13 at 16:03 +0800, Li Zhong wrote:

To my understanding, it is used to enable RCU user extended quiescent
state, so RCU on that cpu doesn't need scheduler ticks. And together
with some other code(already in 3.10), we are able to remove the ticks
in some cases (e.g. only 1 task running on the cpu, with some other
limitations).

Ok, sounds interesting. Once you fix the little cosmetic issue, I don't
see any reason not to merge them as it's basically wiring up an existing
feature (in that regard the patches are pretty straightforward) and I
assume the overhead is only there when you enable it.

Cheers,
Ben.