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

["刘海坤" <lhk518@xxxxxxx>]

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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