On Tuesday, July 13, 2021 11:59 PM, Peter Xu wrote: > On Tue, Jul 13, 2021 at 08:40:21AM +0000, Wang, Wei W wrote: > > Didn't get a chance to document it as it's in a pull now; but as long as > you're okay > with no-per-page lock (which I still don't agree with), I can follow this up. > > Are below parameters enough for me to enable free-page-hint? > > -object iothread,id=io1 \ > -device virtio-balloon,free-page-hint=on,iothread=io1 \ > > I tried to verify it's running by tracing inside guest with kprobe > report_free_page_func() but it didn't really trigger. Guest has kernel > 5.11.12-300.fc34.x86_64, should be fairly new to have that supported. Do you > know what I'm missing?
Please check if you have the virtio-balloon driver loaded in the guest. > > P.S. This also reminded me that, maybe we want an entry in qemu-options.hx for > balloon device, as it has lots of options, some of them may not be easy to be > setup right. > Sounds good to me. Best, Wei
