Re: [GIT PULL] perf changes for v3.8
[Posted December 19, 2012 by jake]
| From: |
| Ingo Molnar <mingo-AT-kernel.org> |
| To: |
| David Ahern <dsahern-AT-gmail.com> |
| Subject: |
| Re: [GIT PULL] perf changes for v3.8 |
| Date: |
| Thu, 13 Dec 2012 08:30:56 +0100 |
| Message-ID: |
| <20121213073056.GA13156@gmail.com> |
| Cc: |
| Linus Torvalds <torvalds-AT-linux-foundation.org>,
Linux Kernel Mailing List <linux-kernel-AT-vger.kernel.org>,
Arnaldo Carvalho de Melo <acme-AT-infradead.org>,
Peter Zijlstra <a.p.zijlstra-AT-chello.nl>,
Thomas Gleixner <tglx-AT-linutronix.de>,
Andrew Morton <akpm-AT-linux-foundation.org> |
| Archive‑link: | |
Article |
* David Ahern <dsahern@gmail.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
