In the previous patch, we made it easy to define other filters that
exclude all objects of a certain type. Use that in order to implement
bitmap-level filtering for the '--filter=tree:<n>' filter when 'n' is
equal to 0.
The general case is not helped by bitmaps, since for values of 'n > 0',
the object filtering machinery requires a full-blown tree traversal in
order to determine the depth of a given tree. Caching this is
non-obvious, too, since the same tree object can have a different depth
depending on the context (e.g., a tree was moved up in the directory
hierarchy between two commits).
But, the 'n = 0' case can be helped, and this patch does so. Running
p5310.11 in this tree and on master with the kernel, we can see that
this case is helped substantially:
Test master this tree
--------------------------------------------------------------------------------
5310.11: rev-list count with tree:0 10.68(10.39+0.27) 0.06(0.04+0.01) -99.4%
Signed-off-by: Taylor Blau <me@xxxxxxxxxxxx>
---
pack-bitmap.c | 25 ++++++++++++++++++++++++-
t/perf/p5310-pack-bitmaps.sh | 5 +++++
t/t6113-rev-list-bitmap-filters.sh | 21 +++++++++++++++++++++
3 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/pack-bitmap.c b/pack-bitmap.c
index 3693c9e62f..195ee8cad0 100644
--- a/pack-bitmap.c
+++ b/pack-bitmap.c
@@ -749,7 +749,7 @@ static void filter_bitmap_exclude_type(struct bitmap_index *bitmap_git,
eword_t mask;
uint32_t i;
- if (type != OBJ_BLOB)
+ if (type != OBJ_BLOB && type != OBJ_TREE)
BUG("filter_bitmap_exclude_type: unsupported type '%d'", type);
/*
@@ -867,6 +867,20 @@ static void filter_bitmap_blob_limit(struct bitmap_index *bitmap_git,
bitmap_free(tips);
}
+static void filter_bitmap_tree_depth(struct bitmap_index *bitmap_git,
+ struct object_list *tip_objects,
+ struct bitmap *to_filter,
+ unsigned long limit)
+{
+ if (limit)
+ BUG("filter_bitmap_tree_depth given non-zero limit");
+
+ filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
+ OBJ_TREE);
+ filter_bitmap_exclude_type(bitmap_git, tip_objects, to_filter,
+ OBJ_BLOB);
+}
+
static int filter_bitmap(struct bitmap_index *bitmap_git,
struct object_list *tip_objects,
struct bitmap *to_filter,
@@ -890,6 +904,15 @@ static int filter_bitmap(struct bitmap_index *bitmap_git,
return 0;
}
+ if (filter->choice == LOFC_TREE_DEPTH &&
+ filter->tree_exclude_depth == 0) {
+ if (bitmap_git)
+ filter_bitmap_tree_depth(bitmap_git, tip_objects,
+ to_filter,
+ filter->tree_exclude_depth);
+ return 0;
+ }
+
/* filter choice not handled */
return -1;
}
diff --git a/t/perf/p5310-pack-bitmaps.sh b/t/perf/p5310-pack-bitmaps.sh
index 80c53edca7..75ccf9f4e3 100755
--- a/t/perf/p5310-pack-bitmaps.sh
+++ b/t/perf/p5310-pack-bitmaps.sh
@@ -53,6 +53,11 @@ test_perf 'rev-list count with blob:limit=1k' '
--filter=blob:limit=1k >/dev/null
'
+test_perf 'rev-list count with tree:0' '
+ git rev-list --use-bitmap-index --count --objects --all \
+ --filter=tree:0 >/dev/null
+'
+
test_perf 'simulated partial clone' '
git pack-objects --stdout --all --filter=blob:none </dev/null >/dev/null
'
diff --git a/t/t6113-rev-list-bitmap-filters.sh b/t/t6113-rev-list-bitmap-filters.sh
index 145603f124..2b551e6fd0 100755
--- a/t/t6113-rev-list-bitmap-filters.sh
+++ b/t/t6113-rev-list-bitmap-filters.sh
@@ -53,4 +53,25 @@ test_expect_success 'blob:limit filter with specified blob' '
test_bitmap_traversal expect actual
'
+test_expect_success 'tree:0 filter' '
+ git rev-list --objects --filter=tree:0 HEAD >expect &&
+ git rev-list --use-bitmap-index \
+ --objects --filter=tree:0 HEAD >actual &&
+ test_bitmap_traversal expect actual
+'
+
+test_expect_success 'tree:0 filter with specified blob, tree' '
+ git rev-list --objects --filter=tree:0 HEAD HEAD:two.t >expect &&
+ git rev-list --use-bitmap-index \
+ --objects --filter=tree:0 HEAD HEAD:two.t >actual &&
+ test_bitmap_traversal expect actual
+'
+
+test_expect_success 'tree:1 filter' '
+ git rev-list --objects --filter=tree:1 HEAD >expect &&
+ git rev-list --use-bitmap-index \
+ --objects --filter=tree:1 HEAD >actual &&
+ test_cmp expect actual
+'
+
test_done
--
2.26.0.113.ge9739cdccc
