Subject: Re: [PATCH] powerpc: inline ppc64_runlatch_off

From: Anton Blanchard <[email-masked]>
Date: Fri, 6 Aug 2010 16:51:12 +1000

Hi,

> remind me why we need to do that runlatch thing on these CPUs at all ?

The PMU uses it so events can be constructed that count only non idle cycles.
I think the power management hardware on POWER6 and POWER7 also use the
runlatch state to determine how busy a CPU is.

Anton