Re: [PATCH v2 5/5] mm: page_alloc: reduce unnecessary binary search in early_pfn_valid()

Hi Jia, Thank you for the patch! Yet something to improve: [auto build test ERROR on mmotm/master] [also build test ERROR on next-20180323] [cannot apply to v4.16-rc6] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url:

Re: [PATCH v2 5/5] mm: page_alloc: reduce unnecessary binary search in early_pfn_valid()

Hi Jia, Thank you for the patch! Yet something to improve: [auto build test ERROR on mmotm/master] [also build test ERROR on next-20180323] [cannot apply to v4.16-rc6] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url:

[PATCH v2 5/5] mm: page_alloc: reduce unnecessary binary search in early_pfn_valid()

Commit b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns where possible") optimized the loop in memmap_init_zone(). But there is still some room for improvement. E.g. in early_pfn_valid(), if pfn and pfn+1 are in the same memblock region, we can record the last returned memblock

[PATCH v2 5/5] mm: page_alloc: reduce unnecessary binary search in early_pfn_valid()

Commit b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns where possible") optimized the loop in memmap_init_zone(). But there is still some room for improvement. E.g. in early_pfn_valid(), if pfn and pfn+1 are in the same memblock region, we can record the last returned memblock