On Thu, 23 Sep 2021 07:36:21 +0100, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > On 22/09/21 20:53, Marc Zyngier wrote: > > I definitely regret adding the current KVM trace points, as they > > don't show what I need, and I can't change them as they are ABI. > > I disagree that they are ABI. And even if you don't want to change > them, you can always add parameters or remove them. We'll have to agree to disagree here. Experience has told me that anything that gets exposed to userspace has to stay forever. There are countless examples of that on the arm64 side (cue the bogomips debate, the recent /proc/interrupts repainting). We had that discussion a few KSs ago (triggered by this[1] if I remember correctly), and I don't think anything has changed since. As for removing them, that would probably be best for some (if not most) of them. M. [1] https://lwn.net/Articles/737532/ -- Without deviation from the norm, progress is not possible.
