linux-kernel - Re: [GIT PULL] perf changes for v3.8

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Message-ID: <CA+55aFzADpQTEGNDNVBpL9Ep8xD=9_1pViiZvFLb4KPzKpKNZQ@mail.gmail.com>
Date:	Sat, 22 Dec 2012 16:00:00 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] perf changes for v3.8

Sure. I actually think both should be deprecated, and replaced with
explicit "trace guest" vs "trace host" flags, just to make it
consistent, but I don't care deeply.

The only thing I care about is that compatibility must never be broken
(which the current setup does), and that people who don't use
virtualization should never be asked to use flags that have anything
to do with virtualization (which the current work-around involves).

        Linus

On Sat, Dec 22, 2012 at 11:22 AM, David Ahern <dsahern@...il.com> wrote:
> any opinions on whether the approach is reasonable?
>
> On 12/16/12 9:43 PM, David Ahern wrote:
>>
>> All that is needed is for the current exclude_guest flag to be
>> deprecated such that for older binaries on newer kernels it is ignored
>> (perhaps a warn on once), and then a new flag -- exclude_guest2 -- is
>> then used for the new logic.
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