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

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Message-ID: <1368436970.2618.48.camel@ThinkPad-T5421>
Date:	Mon, 13 May 2013 17:22:50 +0800
From:	Li Zhong <zhong@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	paulmck@...ux.vnet.ibm.com, fweisbec@...il.com, paulus@...ba.org,
	michael@...erman.id.au, Anton Blanchard <anton@....ibm.com>
Subject: Re: [RFC PATCH v3 0/5] powerpc: Support context tracking for Power
 pSeries

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.
> 
> 


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