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

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Message-ID: <507EEC53.1010309@zytor.com>
Date:	Wed, 17 Oct 2012 10:35:15 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	lenb@...nel.org, linux-acpi@...r.kernel.org, x86@...nel.org
Subject: Re: Is: axe read_tscp pvops call. Was: Re: [RFC] ACPI S3 and Xen
 (suprisingly small\!).

On 10/17/2012 09:54 AM, Konrad Rzeszutek Wilk wrote:
>>
>> Could you do an audit for other pvops calls that have no users?  If
>> the *only* user is lguest, we should talk about it, too...
>
> I can do that - but I don't want to be hasty here. There is a bit of
> danger here - for example the read_pmc (or read_tsc) is not in use right
> now. But it might be when one starts looking at making perf be able to
> analyze the hypervisor (hand-waving the implementation details). So while
> removing read_pmc now sounds good, it might be needed in the future.
>

We do not keep a pvop around just because it "might be needed in the 
future".  That's just crazy.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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