linux-kernel - Re: [PATCH] Trace idle entry and exit times

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Message-ID: <20131207172926.GD21717@two.firstfloor.org>
Date:	Sat, 7 Dec 2013 18:29:26 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Mike Galbraith <bitbucket@...ine.de>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Andi Kleen <ak@...ux.intel.com>, lenb@...nel.org,
	tglx@...utronix.de, peterz@...radead.org
Subject: Re: [PATCH] Trace idle entry and exit times

> > Well that one is obvious. I mean more the subtle problems.
> 
> Yeah, not subtle.  SGI could use C2 as power supply stress tester.

This is only on system where the APIC timer does not tick in deep idle.
At this point these are 5+ year old systems.

There were some ideas of breaking up that lock, but they were never
fully implemented.

-Andi
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