I just want to know in which version of VMware vSphere these memory reclamation techniques were introduced by the VMware.
Hi,
I assume from version ESX 4.0 this technique was brought in place.
Ref ; A Beginner's Guide to Memory Reclamation in ESX/ESXi - Support Insider - VMware Blogs
Version 4.0 is generally attributed with this
Please look at the docs below