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

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Date:	Thu, 13 Dec 2012 08:30:56 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.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


* David Ahern <dsahern@...il.com> wrote:

> > But doing it this way was wrong. Switch that "exclude_guest" 
> > attribute around, and admit that "H" was bogus, and that the 
> > right thing to do was to add a "V" flag that sets the 
> > "force_guest" flag instead.
> 
> I understand this is annoying. [...]

It's not annoying, it's outright broken - it's a regression that 
we'll fix.

> [...] Older binaries on newer kernels was the only case I 
> could not fix. [...]

The "only" case?? Old, working binaries are actually our _most_ 
important usecase: it's 99.9% of our current installed base ...

> [...] (I guess a message could be added kernel side to at 
> least give a hint.) But the alternative -- based on code that 
> has existed for some time -- is for older binaries to crash 
> VMs.

That should be fixed differently, by not breaking existing 
working functionality.

Thanks,

	Ingo
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