> Yes, this feature needs to consider when page migration, the content > of the old page needs to be cleared, and the swap space needs to > be cleared before swap. Of course, for security reasons, swap can be > prohibited. Here I just listed some of the changes involved, not all > aspects. This feature is mainly aimed at clearing the memory of > the virtual machine after shutdown, so it is more aimed at anonymous > mapping and huge page mapping > >>> >>> >>> When reusing the page that has been cleared, there is no need to clear it >>> >>> again, which also speeds up the memory allocation of user-mode programs. >>> >>> >>> Is this feature feasible? >> >> "init_on_free=1" for the system as a whole, which might sounds like what >> might tackle part of your use case. >> > > This feature is mainly to prevent the used memory information from leaking, > not to clear the memory before use. That's the whole purpose of init_on_free -- maybe you should give that a second look. I don't think MAP_UNMAPZERO is what we want. -- Thanks, David / dhildenb
