ykzhao wrote: > On Thu, 2009-11-12 at 11:12 +0800, Yinghai Lu wrote: >> ykzhao wrote: >>> On Thu, 2009-11-12 at 03:05 +0800, Yinghai Lu wrote: >>>> ykzhao wrote: >>>>> On Wed, 2009-11-11 at 10:27 +0800, Yinghai Lu wrote: >>>>>> try to find_e820_area/reserve_early, and call acpi_reserve_memory early >>>>>> >>>>>> to get area is below 1M >>>>>> >>>>>> -v2: change function name to acpi_reserve_wakeup_memory according to Rafael >>>>> It seems that the function of find_e820_area is called in several >>>>> places. >>>>> >Initmem_init: bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, >>>>> bootmap_size, PAGE_SIZE); >>>>> >>>>> If we also call it in the acpi_reserve_wakeup_memory, do we get the same >>>>> base address as that obtained in initmem_init? >>>> no. find_e820_area will check the reserve res array that could be updated by reserve_early. >>> It will check the reserved region array when calling the function of >>> find_e820_area. >>> But it seems that the array is not updated when the find_e820_area is >>> called in the function of initmem_init. >> right after that will use reserve_bootmem for those range in initmem_init. > Yes. The reserve_bootmem is called for the range in initmem_init. > But the reserved_early array is not updated. it is not needed anymore because bootmem for that node is ready at that point, could use reserve_bootmem_node directly. and before that early_res_to_bootmem will convert that early resource that fall into that node range to bootmem reserved too. please check code setup_node_bootmem/early_node_mem/early_res_to_bootmem ...and reserve_bootmem_node... YH _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
