Balloon question

I'm trying to understand in detail how the balloon pilot really works.

My previous understanding was the object of the balloon pilot is a way for the hypervisor ro retrieve the memory of guests when memory is overused and fear - it's because guests have no another way to 'give' memory to the hypervisor, or hypervisor knows, and therefore no way, to the memory of relaim according to the needs of the guests.

Another my understanding, which I am now starting to question, is that this ball always causes the customer to the page (using its internal pagination techniques).  Also, everyone I talk to the same thing, said balloon = pagination in comments.  Really?  What makes me question this is the difference between consumption and and memory active .  Still serves as memory consumed by the virtual machine - in other words, even if it is not active, is not yet been recovered by the hyervisor, so the hypervisor cannot give her other guests.  So my question is: is the typical work of the balloon to reclaim consumed memory (which does not affect the virtual machine) and then active memory (which can cause paging), or does always go after the active memory?

My reasoning of thought balloon goes after consumed memory and therefore does not always imply the pagination in the comments until we need to get the memory active , is the following excerpt from VMware:

Capture.JPG

Thoughts? Am I overthinking this?

Thank you

Matt

mattheff wrote:

Another my understanding, which I am now starting to question, is that this ball always causes the customer to the page (using its internal pagination techniques).  Also, everyone I talk to the same thing, said balloon = pagination in comments.

Not quite.  The balloon pilot aims to politely ask guests to give back a percentage preset (default 65%) of unreserved memory (memory - reserved memory limit).  It is usually memory on the free list of the guest.  If the memory is actually free, that there is no impact to the guest - he may never used memory sitting on its free list anyway.

If the memory is not free but is active, this will cause an impact on the guest.  For example, if you the ball in areas of MS SQL, SQL predefined buffer detects this and evacuated its caches, including its query cache.  For Java applications, you might end up taking the memory it uses for its performance of garbage collection and kill.

Hot air balloon must be handled properly.  Done wrong, you kill you and take memory which can cause requests for comments slow down or crash (Linux OOM-kills is a known side effect).  Fact properly and you free up idle resources and give them to customers who actually need them allowing you to postpone or eliminate the purchase of memory possible.

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