It is if you tell the kernel. zero memory on free (3-5% average system performance impact, due to touching cold memory) init_on_free=1 zero memory on alloc

It is if you tell the kernel. zero memory on free (3-5% average system performance impact, due to touching cold memory) init_on_free=1 zero memory on alloc (<1% average system performance impact) init_on_alloc=1