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SubjectRe: [PATCH v2 0/5] Add movablecore_map boot option
On 2012-11-28 13:21, Wen Congyang wrote:
> At 11/28/2012 12:01 PM, Jiang Liu Wrote:
>> On 2012-11-28 11:47, Tang Chen wrote:
>>> On 11/27/2012 11:10 AM, wujianguo wrote:
>>>> Hi Tang,
>>>> DMA address can't be set as movable, if some one boot kernel with
>>>> movablecore_map=4G@0xa00000 or other memory region that contains DMA address,
>>>> system maybe boot failed. Should this case be handled or mentioned
>>>> in the change log and kernel-parameters.txt?
>>> Hi Wu,
>>> I think we can use MAX_DMA_PFN and MAX_DMA32_PFN to prevent setting DMA
>>> address as movable. Just ignore the address lower than them, and set
>>> the rest as movable. How do you think ?
>>> And, since we cannot figure out the minimum of memory kernel needs, I
>>> think for now, we can just add some warning into kernel-parameters.txt.
>>> Thanks. :)
>> On one other OS, there is a mechanism to dynamically convert pages from
>> movable zones into normal zones.
> The OS auto does it? Or the user coverts it?
> We can convert pages from movable zones into normal zones by the following
> interface:
> echo online_kernel >/sys/devices/system/memory/memoryX/state
> We have posted a patchset to implement it, and it is in mm tree now.
OS automatically converts it, no manual operations needed.

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