linux-kernel - Re: [Xen-devel] Is: axe read_tscp pvops call. Was: Re: [RFC] ACPI S3 and Xen (suprisingly small\!).

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Date:	Thu, 18 Oct 2012 19:02:02 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad@...nel.org>
CC:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"lenb@...nel.org" <lenb@...nel.org>
Subject: Re: [Xen-devel] Is: axe read_tscp pvops call. Was: Re: [RFC] ACPI
 S3 and Xen (suprisingly small\!).

On 18/10/12 18:42, Konrad Rzeszutek Wilk wrote:
>> As for 'perf', since Xen already provides a virtual PMU for HVM guests
>> It's not clear why we would spend the effort to implement another
>> mechanism for PV guests (instead of using the virtual PMU from a PVH guest).
> 
> Would that allow one to evaluate the performance/bottlenecks that the
> hypervisor might have?

Not right now, no. But I don't so why it couldn't be possible.

David

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