[Xen-devel] RE: [PATCH][BALLOON] Fix minimum target

["Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx>]

> ballooning on other systems then I think we'll have to wait for
someone
> to implement a more dynamic scheme (e.g., by hooking off the
> OOM/low-memory paths, or by slowly allocating memory only when we can
> see a reasonable amount of pages available on the free lists).

>From the little code reading I have done, your second option seems
better. Once the code goes down the OOM path the system is already in a
shaky unstable state. The balloon driver has to be made to back off way
before that. I have been meaning to try and look into this. I will try
and do so. 

> I'm rather doubtful that a really good static estimate can be derived,
> since it depends so much on particular details of kernel memory usage.

I agree.

> Given the results of these experiments I'm tempted to remove the 2%
> minimum that is already in the tree -- vendors can make their own
patch
> if they have a better idea of what works for their particular kernel
> setups.

I second this opinion. I think it is better if you remove the 2%
minimum. It really serves no purpose in the majority of situations.

Aravindh

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