What does this have to do with RCU?
I'm talking about KVM, which is a Linux kernel feature that is useless without
a proper, KVM-specific app making use of it.
RCU is a general kernel performance feature that works across the board. It
helps KVM indirectly, and it helps many other kernel subsystems as well. It
needs no user-space tool to be useful.
KVM on the other hand is useless without a user-space tool.
[ Theoretically you might have a fair point if it were a critical feature of
RCU for it to have a GUI, and if the main tool that made use of it sucked.
But it isnt and you should know that. ]
Had you suggested the following 'NAK', applied to a different, relevant
subsystem:
| NAK. Improving scalability is pointless while we don't have a usable
| tool. I'll review you perf patches _after_ you've contributed a usable
| tool.
you would have a fair point. In fact, we are doing that we are living by that.
It makes absolutely zero sense to improve the scalability of perf if its
usability sucks.
So where you are trying to point out an inconsistency in my argument there is
none.
That is my precise point.
KVM is a specific subsystem or "area" that makes no sense without the
user-space tooling it relates to. You seem to argue that you have no 'right'
to insist on good quality of that tooling - and IMO you are fundamentally
wrong with that.
Thanks,
Ingo
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