On Wed, May 08, 2024 at 07:01:29AM -0700, Sean Christopherson wrote: > On Wed, May 08, 2024, Leonardo Bras wrote: > > Something just hit me, and maybe I need to propose something more generic. > > Yes. This is what I was trying to get across with my complaints about keying off > of the last VM-Exit time. It's effectively a broad stroke "this task will likely > be quiescent soon" and so the core concept/functionality belongs in common code, > not KVM. > Hello Sean, Paul implemented the RCU patience cmdline option, that will help avoiding rcuc waking up if the grace period is younger than X miliseconds, which means the last quiescent state needs to be at least X miliseconds old. With that I just have to add a quiescent state in guest_exit(), and we will be able to get the same effect of last_guest_exit patch. I sent this RFC patch doing that: https://lore.kernel.org/all/20240511020557.1198200-1-leobras@xxxxxxxxxx/ Please take a look. Thanks! Leo
