On Mon, May 13, 2013 at 06:59:23PM +1000, Benjamin Herrenschmidt wrote: > 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.
Yeah when CONFIG_RCU_USER_QS=n and CONFIG_VIRT_CPU_ACCOUNTING_GEN=n this should be zero overhead. And those configs are only needed for full dynticks. Thanks. > > Cheers, > Ben. > > _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev