Proposal to change page allocation to zero on free in the -virtual kernel

[Peter Lieven]

Hi,

I would like to know if it would be a good idea to change the page allocator zeroing
policy from zero on allocate (for GFP_USER) to zero on free for the -virtual kernel builds.

This has been initally proposed in grsecurity for security reasons, but it is extremely
beneficial in virtual environments for 2 additional reasons:

a) live migration
b) ksm

What is your opinion on this?

Thanks,
Peter