Subject: Re: [RFC PATCH v3 0/5] powerpc: Support context tracking for Power pSeries

From: Li Zhong <[email-masked]>
Date: Mon, 13 May 2013 17:22:50 +0800

On Mon, 2013-05-13 at 18:59 +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.

Thanks for your support, Ben.

Yes, there should be no overhead if not enabled. 

Thanks, Zhong

> Cheers,
> Ben.