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RE: [Xen-devel] One question on alloc_bitmap

To: Daniel Magenheimer <dan.magenheimer@xxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Wang, Shane" <shane.wang@xxxxxxxxx>
Subject: RE: [Xen-devel] One question on alloc_bitmap
From: "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>
Date: Mon, 22 Sep 2008 13:35:52 +0800
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Thread-topic: [Xen-devel] One question on alloc_bitmap
Sure, can you please share the patch to avoid duplicate patch?

Yunhong Jiang

Daniel Magenheimer <mailto:dan.magenheimer@xxxxxxxxxx> 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@xxxxxxxxxxxxx]
>> Sent: Friday, September 19, 2008 3:32 AM
>> To: Jiang, Yunhong; xen-devel@xxxxxxxxxxxxxxxxxxx; Wang, Shane
>> Subject: Re: [Xen-devel] One question on alloc_bitmap
>> On 19/9/08 10:17, "Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx> 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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