linux-kernel - Re: [RFC PATCH V4 4/5] cpuidle: driver for xen

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Message-id: <alpine.LFD.2.02.1103231659210.12911@x980>
Date:	Thu, 24 Mar 2011 03:18:14 -0400 (EDT)
From:	Len Brown <lenb@...nel.org>
To:	Trinabh Gupta <trinabh@...ux.vnet.ibm.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	arjan@...ux.intel.com, peterz@...radead.org,
	suresh.b.siddha@...el.com, benh@...nel.crashing.org,
	venki@...gle.com, ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	sfr@...b.auug.org.au, xen-devel@...ts.xensource.com
Subject: Re: [RFC PATCH V4 4/5] cpuidle: driver for xen

Is a CONFIG_XEN kernel supposed to use just HLT in idle?

xen_arch_setup() does this:

        pm_idle = default_idle;
        boot_option_idle_override = IDLE_HALT;

which has that effect.  I guess this makes sense b/c the
CONFIG_XEN kernel is Dom0 and the real C-sates are done
by the hypervisor?

Would the same CONFIG_XEN kernel binary ever not
run xen_arch_setup(), run on raw hardware, and want
to use idle states other than HLT?

thanks,
-Len Brown, Intel Open Source Technology Center


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