[PATCH 4/5] name-hash: specify initial size for istate.dir_hash table

[Johannes Schindelin <johannes.schindelin@gmx.de>]

From: Jeff Hostetler <jeffhost@microsoft.com>

Specify an initial size for the istate.dir_hash hash map matching the
size of the istate.name_hash.

Previously hashmap_init() was given 0, causing a 64 bucket hashmap to be
created. When working with very large repositories, this would cause
numerous rehash() calls to realloc and rebalance the hashmap. This is
especially true when the worktree is deep, with many directories
containing a only a few files each.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 name-hash.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/name-hash.c b/name-hash.c
index 49eb84846df..8f8336cc868 100644
--- a/name-hash.c
+++ b/name-hash.c
@@ -143,7 +143,8 @@ static void lazy_init_name_hash(struct index_state *istate)
 		return;
 	hashmap_init(&istate->name_hash, (hashmap_cmp_fn) cache_entry_cmp,
 			istate->cache_nr);
-	hashmap_init(&istate->dir_hash, (hashmap_cmp_fn) dir_entry_cmp, 0);
+	hashmap_init(&istate->dir_hash, (hashmap_cmp_fn) dir_entry_cmp,
+			istate->cache_nr);
 	for (nr = 0; nr < istate->cache_nr; nr++)
 		hash_index_entry(istate, istate->cache[nr]);
 	istate->name_hash_initialized = 1;
-- 
2.11.1.windows.1