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[Xen-devel] _domain in page_info structure
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
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| Subject: | [Xen-devel] _domain in page_info structure |
| From: | jeet <jeet_sat12@xxxxxxxxxxx> |
| Date: | Tue, 27 Mar 2007 13:55:52 +0530 (IST) |
| Delivery-date: | Tue, 27 Mar 2007 01:27:31 -0700 |
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Hi All,
I am looking into the get_page() function implementation in Xen
where I encounter the reference to _domain
nd = page->u.inuse._domain;
what this field is used for?
I found comment in source ode about it
/* Meaning of the _domain field in shadow pages
* --------------------------------------------
*
* In shadow pages, this field will always have its least significant bit
* set. This ensures that all attempts to get_page() will fail (as all
* valid pickled domain pointers have a zero for their least significant bit).
* Instead, the remaining upper bits are used to record the shadow generation
* counter when the shadow was created.
*/
But I am not able to understand this.What is actual significance of this
variable?
Please provide your valuable replies.
jeet
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