mm: change munmap splitting order and move_vma()

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Splitting can be more efficient when the order is not of concern.  Change
do_vmi_align_munmap() to reduce walking of the tree during split
operations.

move_vma() must also be altered to remove the dependency of keeping the
original VMA as the active part of the split.  Transition to using vma
iterator to look up the prev and/or next vma after munmap.

[Liam.Howlett@oracle.com: fix vma iterator initialization]
  Link: https://lkml.kernel.org/r/20230126212011.980350-1-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20230120162650.984577-39-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

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Liam R. Howlett 2023-01-20 11:26:39 -05:00 • committed by Andrew Morton

parent cc8d1b097d

commit 6b73cff239

2 changed files with 19 additions and 27 deletions

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18

mm/mmap.c

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28

mm/mremap.c

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