linux-kernel - Re: [PATCH 1/3] [kidled]: introduce kidled.

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Date:	Thu, 15 Apr 2010 09:46:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Salman Qazi <sqazi@...gle.com>
Cc:	Andi Kleen <andi@...stfloor.org>, mingo@...e.hu,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	svaidy@...ux.vnet.ibm.com, linux-pm@...ts.linux-foundation.org,
	arjan@...radead.org, csadler@...gle.com, ranjitm@...gle.com,
	kenchen@...gle.com, dawnchen@...gle.com
Subject: Re: [PATCH 1/3] [kidled]: introduce kidled.

On Wed, 2010-04-14 at 08:41 -0700, Salman Qazi wrote:
> 
> To capture all the quantities for a CPU atomically, they must be read
> on the CPU.  Basically, reading them on that CPU prevents them from
> changing as we read them.
> 
> Also, if the CPU is idle (injected or otherwise), the quantities won't
> get updated. 

Who cares? by the time they reach userspace they've changed anyway.

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