Released from memory recovery - how it works?

Hello

A question for my general culture and about the performance management training: an ESX how to retrieve the memory of the released VM.

I explain my question, when a virtual machine needs memory, give VMkernel memory physical host on the virtual computer.

The virtual machine uses its physical memory management to meet the needs of the applications. This means, physical memory consumption host is more and more for this particular virtual machine. When the physical memory of comments is released, because the applications published it, the guest operating system will not really free memory, but write in its pages from memory 'list free STRP' released and usable.

So my question is how the VMkernel can free up memory the guest OS comes out, because it doesn't have access to the free guest operating system list. The kernel never considers memory as released and no longer used by the virtual machine. It should mean when a virtual machine is running, increase consumption of memory and down because memory is never never know by the kernel as released. I know that is not the case, then, how this can happen.

I assume that when the pilot balloon inflate, all pages of the free guest list allows to meet the demand of memory of ball. It sews a way to free the memory of the released OS because free pages are gived the balloon and the kernel can then use. But what happens if the ball never develops and what happens if the VMware tools are not installed?

Thanks for your help.

Best regards.



==================

Senior consultant

VMware instructor

VCP 3-4 / 3-4 VCI

==================

> If I understand you, Vmkernel knows how many times / if the memory of its allocation list is accessible from the VM OS and is able to determine if the pages of memory are active or not (from the BONES of the VM perspective). I guess that this mechanism is used to estimate the "memory active comments" displayed on the virtual machine Summary tab.

Fix

> But you mean that this mechanism is used to retrieve non-active memory only in conflict? Is this fair? in a normal situation that VMkernel recover memory (even though he knows there compress) due to the performance of deallocation of cost allocation?

Property to true. As I said earlier, there is no performance degradation if memory is not recovered during the State of the statement No.

I hope this helps!

Tags: VMware

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