linux-kernel - Re: [PATCH 0/3] cpu: idle state framework for offline CPUs.

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Message-Id: <1249571622.32113.510.camel@twins>
Date:	Thu, 06 Aug 2009 17:13:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	svaidy@...ux.vnet.ibm.com
Cc:	Shaohua Li <shaohua.li@...el.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Joel Schopp <jschopp@...tin.ibm.com>,
	"Brown, Len" <len.brown@...el.com>,
	Balbir Singh <balbir@...ibm.com>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>,
	Dipankar Sarma <dipankar@...ibm.com>,
	"Darrick J. Wong" <djwong@...ibm.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] cpu: idle state framework for offline CPUs.

On Thu, 2009-08-06 at 17:03 +0200, Peter Zijlstra wrote:
> On Thu, 2009-08-06 at 10:03 +0530, Vaidyanathan Srinivasan wrote:
> > This was the
> > main objection to Venki's deepest sleep state for offline cpus patch.
> 
> Well, my main objection was that is was a single raw function pointer
> without any management layer around it.
> 
> We have the exact same mess with the idle routine - and that has bitten
> us in the past.

That said, I still think it makes sense to share this with the idle
routine, we can make some callbacks unsuitable for hot-unplug just fine.
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