On Fri, 20 Jul 2018, Yang Shi wrote: > I agree to keep it for a while to let that security bug cool down, however, if > there is no user anymore, it sounds pointless to still keep a dead knob. > It's not a dead knob. We use it, and for reasons other than CVE-2017-1000405. To mitigate the cost of constantly compacting memory to allocate it after it has been freed due to memry pressure, we can either continue to disable it, allow it to be persistently available, or use a new value for use_zero_page to specify it should be persistently available.
