At 11:37 -0400 on 01 Apr (1207049874), weiming wrote:
> Do you know under which situation we use writable page table instead of
> calling update_va_mapping?
Not in any detail.
> And do you know the purpose of the counter defined in
> page_info.u.in_use.type_info?
> I understand that xen needs to keep track of the type of each page
> (L1_page_table_page, L2_page_table_page, pinned, unpinned, validated, etc),
> but why do we need to use the lower 26 bits of "type_info" as a counter? (in
> "get_page_type()", the counter is increased. ) Similarly, get_page() /
> put_page() also increases/decreases the page.count_info. Could you please
> give me some hint about the usage of such counters?
You should read the comments at the top of xen/arch/x86/mm.c.
Tim.
--
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Citrix Systems (R&D) Ltd.
[Company #02300071, SL9 0DZ, UK.]
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