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| author | Liam R. Howlett <[email protected]> | 2023-05-31 21:54:02 -0400 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2023-06-19 16:19:28 -0700 |
| commit | 65ac132027a884c411b8f9f96d240ba2dde34dec (patch) | |
| tree | f92d17b52dd61c61ca0678003c3715426f436fd1 /tools/perf/scripts/python/netdev-times.py | |
| parent | 1e3be4856f49d55c60b6cd500297b06acfe216a9 (diff) | |
userfaultfd: fix regression in userfaultfd_unmap_prep()
Android reported a performance regression in the userfaultfd unmap path.
A closer inspection on the userfaultfd_unmap_prep() change showed that a
second tree walk would be necessary in the reworked code.
Fix the regression by passing each VMA that will be unmapped through to
the userfaultfd_unmap_prep() function as they are added to the unmap list,
instead of re-walking the tree for the VMA.
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 69dbe6daf104 ("userfaultfd: use maple tree iterator to iterate VMAs")
Signed-off-by: Liam R. Howlett <[email protected]>
Reported-by: Suren Baghdasaryan <[email protected]>
Suggested-by: Matthew Wilcox (Oracle) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/netdev-times.py')
0 files changed, 0 insertions, 0 deletions