[PATCH v2 5/9] cache-tree: trace regions for prime_cache_tree

["Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>]

From: Derrick Stolee <dstolee@microsoft.com>

Commands such as "git reset --hard" rebuild the in-memory representation
of the cached tree index extension by parsing tree objects starting at a
known root tree. The performance of this operation can vary widely
depending on the width and depth of the repository's working directory
structure. Measure the time in this operation using trace2 regions in
prime_cache_tree().

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 cache-tree.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cache-tree.c b/cache-tree.c
index 45fb57b17f3..7da59b2aa07 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -744,10 +744,13 @@ void prime_cache_tree(struct repository *r,
 		      struct index_state *istate,
 		      struct tree *tree)
 {
+	trace2_region_enter("cache-tree", "prime_cache_tree", the_repository);
 	cache_tree_free(&istate->cache_tree);
 	istate->cache_tree = cache_tree();
+
 	prime_cache_tree_rec(r, istate->cache_tree, tree);
 	istate->cache_changed |= CACHE_TREE_CHANGED;
+	trace2_region_leave("cache-tree", "prime_cache_tree", the_repository);
 }
 
 /*
-- 
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