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[Xen-devel] how can I find out the free pages in a guest OS?

from [刘海坤]

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Subject:	[Xen-devel] how can I find out the free pages in a guest OS?
From:	"刘海坤" <lhk518@xxxxxxx>
Date:	Thu, 16 Jul 2009 17:38:13 +0800
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Hi, all

I want to reduce the checkpoint size of a VM by memory exclusion. I try to find out all the free pages by reference count at VMM-level, As they declared that:

/* Page is on a free list: ((count_info & PGC_count_mask) == 0). */ , in struct page_info which is defined in /xen/include/asm-x86/mm.h, but unfortunately, all the pages in a idle VM accords with this condition. I prints out the reference count of all memory pages, all of them are equal to or bigger than 2. Anyone can tell me the reason? and how can I find out the free pages in a guest OS?

Best regards

haikun liu

2009-07-16

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