From: Anton Blanchard <anton@samba.org>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] powerpc: inline ppc64_runlatch_off
Date: Fri, 6 Aug 2010 16:51:12 +1000 [thread overview]
Message-ID: <20100806065112.GT29316@kryten> (raw)
In-Reply-To: <1281075949.2168.31.camel@pasglop>
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
next prev parent reply other threads:[~2010-08-06 6:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-06 4:53 [PATCH] powerpc: inline ppc64_runlatch_off Anton Blanchard
2010-08-06 5:17 ` Benjamin Herrenschmidt
2010-08-06 5:56 ` Anton Blanchard
2010-08-06 6:25 ` Benjamin Herrenschmidt
2010-08-06 6:51 ` Anton Blanchard [this message]
2010-08-06 8:02 ` Olof Johansson
2010-08-06 13:28 ` Anton Blanchard
2010-08-09 2:44 ` Olof Johansson
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