Re: [GIT PULL] perf changes for v3.8
From: David Ahern
Date: Thu Dec 13 2012 - 09:30:39 EST
On 12/13/12 12:30 AM, Ingo Molnar wrote:
* David Ahern <dsahern@xxxxxxxxx> 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.
One of the problems is that existing binaries set the exclude_guest flag
(https://lkml.org/lkml/2012/7/9/292).
So, requesting users to update their binaries if they want to use
precise sampling is not acceptable. A 100% catastrophic failure of all
running VMs is acceptable? All VMs will crash and there is no direct
causal relationship.
David
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