linux-kernel - Re: Performance overhead of get_cycles

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Message-ID: <20071211202954.GA27929@elte.hu>
Date:	Tue, 11 Dec 2007 21:29:54 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Arjan van de Ven <arjan@...radead.org>,
	dor.laor@...ranet.com, kvm-devel <kvm-devel@...ts.sourceforge.net>
Subject: Re: Performance overhead of get_cycles_sync


* Ingo Molnar <mingo@...e.hu> wrote:

> > Which is not on core2 which was the question about. And if it was 
> > turned off it wouldn't use get_cycles_sync() at all.
> 
> it is turned off on core2 too:
> 
>  # cat /sys/devices/system/clocksource/clocksource0/current_clocksource
>  acpi_pm

but you are right that it's not turned off on all core2's, so my patch 
is wrong for them.

	Ingo
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