Re: [Xen-devel] struct page_info

To:	"Cihula, Joseph" <joseph.cihula@xxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "mukesh.rathor@xxxxxxxxxx" <mukesh.rathor@xxxxxxxxxx>
Subject:	Re: [Xen-devel] struct page_info
From:	Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date:	Fri, 24 Apr 2009 08:33:11 +0100
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On 24/04/2009 08:21, "Cihula, Joseph" <joseph.cihula@xxxxxxxxx> wrote:

>>> Also, if "Page is on a free list:", I assume one of the PGC_ fields would
>>> be set?
>> 
>> Not would, but might.
> 
> Would:
>         ((page->count_info & PGC_count_mask) != 0 || page->count_info == 0)
> definitively indicate if a page was in use?

Only PGC_broken|PGC_offlined may be set for a free page. Most free pages
have count_info==0.

 -- Keir



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Re: [Xen-devel] struct page_info