RE: [Xen-devel] One question on alloc_bitmap

Jiang, Yunhong
Mon, 22 Sep 2008 05:35:52 -0000

Sure, can you please share the patch to avoid duplicate patch?

Thanks
Yunhong Jiang

Daniel Magenheimer <mailto:dan.magenheimer@oracle.com>
wrote:
> FYI, I''m working on a patch that requires radix trees and
> have borrowed a bunch of code from Linux for it.  I had
> to make a few changes to generalize the code (e.g.
> callouts for node alloc/free); if it would be useful,
> please let me know and I will post it.
>
>> -----Original Message-----
>> From: Keir Fraser [mailto:keir.fraser@eu.citrix.com]
>> Sent: Friday, September 19, 2008 3:32 AM
>> To: Jiang, Yunhong; xen-devel@lists.xensource.com; Wang, Shane
>> Subject: Re: [Xen-devel] One question on alloc_bitmap
>>
>>
>> On 19/9/08 10:17, "Jiang, Yunhong"
<yunhong.jiang@intel.com> wrote:
>>
>>>>> Any idea on it?
>>>>
>>>> Yes, it could be sparsely allocated in future. No reason why
not.
>>>
>>> Thanks for your clarification. We ask this because we are
considering
>>> memory online.
>>
>> I would suggest we allocate a virtual address range for the
>> bitmap and then
>> demand-populate mappings in that area. Just as we do for the
frame_table.
>>
>> The alternative is an explicit radix tree data structure, but
>> we may as well
>> make use of the page-table structures to do the lookup work for us.
>>
>>  -- Keir
>>
>>
>>
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