Re: [Xen-devel] [PATCH] linux/balloon: don't allow ballooningdowna domain below a reasonable limit

[Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>]

> It might be the case though that, in practice, vm_committed_space is a
> reasonable predictor for working set for some common types of workload. Many
> applications probably keep their heaps fairly warm and hence in main memory.

I am dubious. What vm_committed_space does allow you to do however if you
watch it in Xen is to actually ensure you never balloon out a virtual
machine to the point you make it start killing stuff off.

There are better ways to measure memory pressure - sizes of the various
active and inactive lists etc. OLPC has code for this and a proposed
memory pressure notifier feature that they use to allow user space apps
to cleanup.

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