linux-kernel - Re: [Xen-devel] [PATCH RFC v2 2/4] arm: introduce CONFIG_PARAVIRT and pv_time

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Message-ID: <alpine.DEB.2.02.1305071433560.4147@kaball.uk.xensource.com>
Date:	Tue, 7 May 2013 14:34:59 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"arnd@...db.de" <arnd@...db.de>,
	"marc.zyngier@....com" <marc.zyngier@....com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"will.deacon@....com" <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nico@...aro.org" <nico@...aro.org>,
	"olof@...om.net" <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"cov@...eaurora.org" <cov@...eaurora.org>
Subject: Re: [Xen-devel] [PATCH RFC v2 2/4] arm: introduce CONFIG_PARAVIRT
 and pv_time_ops

On Tue, 7 May 2013, Ian Campbell wrote:
> On Tue, 2013-05-07 at 13:15 +0100, Stefano Stabellini wrote:
> > On Tue, 7 May 2013, Ian Campbell wrote:
> > > On Mon, 2013-05-06 at 15:51 +0100, Stefano Stabellini wrote:
> > > > Introduce CONFIG_PARAVIRT on ARM.
> > > 
> > > What about PARAVIRT_TIME_ACCOUNTING? I'm not sure what it is but it
> > > looks like a more lightweight version of pv stolen time?
> >  
> > PARAVIRT_TIME_ACCOUNTING selects PARAVIRT on x86 :-)
> 
> Ah, that's maybe what confused me.
> 
> TBH its not at all clear to me what distinction the core code is trying
> to make with those two options, but do we not also want/need
> PARAVIRT_TIME_ACCOUNTING? Having reread the help text it seems to be
> some sort of "more accurate" accounting?

It is not clear to me either.
I think that you are right, we probably want PARAVIRT_TIME_ACCOUNTING too.
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