Would you mind providing some more information on this? I googled it but I couldn&#x27;t find any documentation on what you describing.<p>To be clear though, the parent commenter (and I) are talking about the pages that malloc keeps around in the processes memory to be reused (And thus are never released back to the OS). Are you saying FreeBSD&#x2F;OpenBSD&#x2F;others have a system to tell the kernel when a user process has pages it plans to zero, and then a system for the kernel to notify the process when&#x2F;if it does? That would be pretty interesting to see, but I&#x27;ve never heard of that being a thing.