The patch titled
Subject: lib/iommu-helper: skip to next segment
has been added to the -mm tree. Its filename is
lib-iommu-helper-skip-to-next-segment.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/lib-iommu-helper-skip-to-next-segment.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/lib-iommu-helper-skip-to-next-segment.patch
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------------------------------------------------------
From: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
Subject: lib/iommu-helper: skip to next segment
When a large enough area in the iommu bitmap is found but would span a
boundary we continue the search starting from the next bit position. For
large allocations this can lead to several useless invocations of
bitmap_find_next_zero_area() and iommu_is_span_boundary().
Continue the search from the start of the next segment (which is the next
bit position such that we'll not cross the same segment boundary again).
Link: http://lkml.kernel.org/r/alpine.LFD.2.20.1606081910070.3211@schleppi
Signed-off-by: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/iommu-helper.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff -puN lib/iommu-helper.c~lib-iommu-helper-skip-to-next-segment lib/iommu-helper.c
--- a/lib/iommu-helper.c~lib-iommu-helper-skip-to-next-segment
+++ a/lib/iommu-helper.c
@@ -29,8 +29,7 @@ again:
index = bitmap_find_next_zero_area(map, size, start, nr, align_mask);
if (index < size) {
if (iommu_is_span_boundary(index, nr, shift, boundary_size)) {
- /* we could do more effectively */
- start = index + 1;
+ start = ALIGN(shift + index, boundary_size) - shift;
goto again;
}
bitmap_set(map, index, nr);
_
Patches currently in -mm which might be from sebott@xxxxxxxxxxxxxxxxxx are
lib-iommu-helper-skip-to-next-segment.patch
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