[Xen-devel] questions about ballooning

[weiming <zephyr.zhao@xxxxxxxxx>]

I'm interested in the ballooning, so I read the balloon.c
I have a questions:

How is the ballooned pages be used? After decrease_reservation(), balloon driver tells the vmm the pages that it gets. Then, how xen utilizes this reclaimed pages? When other domains (both dom0 and domU) requests increasing reservation, will xen allocate these pages to them?
If yes, from increasing_reservation(), it seems that balloon just releases the pages that it previously occupied. 
If no, where do these "ballooned" pages go?

Thanks a lot in advance!
weiming

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