On Sun, 6 Nov 2011, Ted Ts'o wrote:
The only excuse I can see is a hope to make random changes to the
kernel and userspace tools without having to worry about compatibility
problems, which is an argument I've seen with perf (that you have to
use the same version of perf as the kernel version, which to me is bad
software engineering). And that's why I pointed out that you can't do
that with KVM, since we have out-of-tree userspace users, namely
qemu-kvm.
I've never heard ABI incompatibility used as an argument for perf. Ingo?
As for the KVM tool, merging has never been about being able to do ABI
incompatible changes and never will be. I'm still surprised you even
brought this up because I've always been one to _complain_ about people
breaking the ABI - not actually breaking it (at least on purpose).
Pekka
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