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| author | Liam R. Howlett <Liam.Howlett@Oracle.com> | 2023-01-20 11:26:39 -0500 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-09 16:51:36 -0800 |
| commit | 6b73cff239e52fd43949c40eaabb369298c11aae (patch) | |
| tree | e76702033affec12443462fd11875459af194b32 /mm/mmap.c | |
| parent | cc8d1b097de78bd25b7b1ed32018b21cecbf3f6c (diff) | |
| download | linux-6b73cff239e52fd43949c40eaabb369298c11aae.tar.gz linux-6b73cff239e52fd43949c40eaabb369298c11aae.tar.bz2 linux-6b73cff239e52fd43949c40eaabb369298c11aae.zip | |
mm: change munmap splitting order and move_vma()
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>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 18 |
1 files changed, 2 insertions, 16 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 95ea613a4378..29ffd58d4091 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2329,21 +2329,9 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma, for_each_vma_range(*vmi, next, end) { /* Does it split the end? */ if (next->vm_end > end) { - struct vm_area_struct *split; - - error = __split_vma(vmi, next, end, 1); + error = __split_vma(vmi, next, end, 0); if (error) goto end_split_failed; - - split = vma_prev(vmi); - error = munmap_sidetree(split, &mas_detach); - if (error) - goto munmap_sidetree_failed; - - count++; - if (vma == next) - vma = split; - break; } error = munmap_sidetree(next, &mas_detach); if (error) @@ -2356,9 +2344,7 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma, #endif } - if (!next) - next = vma_next(vmi); - + next = vma_next(vmi); if (unlikely(uf)) { /* * If userfaultfd_unmap_prep returns an error the vmas |