unpack-trees: optimize walking same trees with cache-tree

diff --git a/cache-tree.c b/cache-tree.c
index 181d5919f0fd4d8e838684cd14adafc8fa31ab71..caafbff2ff243bd65ee2def874c32cb75eada858 100644 (file)
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -433,7 +433,9 @@ int cache_tree_update(struct index_state *istate, int flags)
 
        if (i)
                return i;
+       trace_performance_enter();
        i = update_one(it, cache, entries, "", 0, &skip, flags);
+       trace_performance_leave("cache_tree_update");
        if (i < 0)
                return i;
        istate->cache_changed |= CACHE_TREE_CHANGED;