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as I understand >>>> it only happens at mmap() time? >>>> >>>> Suppose before the patch, you have two consecutive VMAs between (PMD, 2*PMD) size. >>>> If they are able to get merged after the patch, why won't they be merged before the patch, >>>> since the VMA characteristics are the same? >>>> >>>> >>> Rik's patch aligned each to 2 MiB boundary. So you'd get gaps: >>> >>> >>> 0 2MB 4MB 6MB 8MB 10MB >>> |-------------.------| |-------------.------| |-------------.------| >>> | . | | . | | . | >>> | . | | . | | . | >>> |-------------.------| |-------------.------| |-------------.------| >>> huge mapped 4k m'd >> The effort to draw this is appreciated! >> >> I understood the alignment, what I am asking is this: >> >> In __get_unmapped_area(), we will return a THP-aligned addr from >> thp_get_unmapped_area_vmflags(). Now for the diagram you have >> drawn, suppose that before the patch, we first mmap() the >> 8MB-start chunk. Then we mmap the 4MB start chunk. >> We go to __mmap_region(), and we see that the 8MB-start chunk >> has mergeable characteristics, so we merge. So the gap goes away? > No because there's a gap, we only merge immedaitely adjacent VMAs. And obviously > gaps mean page tables wouldn't be adjacent either... Ah shoot. That is prev->vm_end == vmg->start in can_vma_merge_left(). Thanks. > > The get_unmmaped_area() would have otherwise given adjacent mappings. Vlasta's > patch means in this case we no longer bother trying to align these because their > _length_ isn't PMD aligned.