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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>