On 05.03.2019 11:56, Cornelia Huck wrote: > On Tue, 5 Mar 2019 05:30:00 -0500 > Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote: > >> Folks, >> >> this is a very simple variant to disable halt polling when the KVM host >> is already running virtualized. We could imagine more complex variants >> (like tuning down the halt polling value) but this seems to do the trick >> for some kvm deployment scenarios on s390x. (e.g. having multiple LPARS >> with KVMs that are in itself already overcommitted). > > Yes, it makes sense to disable halt polling in that scenario, but I > wonder whether we can make "disable halt polling for high steal times" > more architecture-independent (can we obtain steal time quickly in some > kind of architecture-independent way?) Not sure. I think an per-architecture callback should be simple enough Having it generic is likely going to make it more complicated than necessary. > > Btw, power seems to have its own halt polling code; not sure if it > makes sense there as well. > >> This still needs tuning and the right default value, but I want to start >> the discussion. > > Maybe optionally log a stat? I will have a look.
