[PATCH v1 1/2] string-list: use ALLOC_GROW macro when reallocing string_list

[git]

From: Jeff Hostetler <jeffh...@microsoft.com>

Use ALLOC_GROW() macro when reallocing a string_list array
rather than simply increasing it by 32.  This is a performance
optimization.

During status on a very large repo and there are many changes,
a significant percentage of the total run time was spent
reallocing the wt_status.changes array.

This change decreased the time in wt_status_collect_changes_worktree()
from 125 seconds to 45 seconds on my very large repository.

Signed-off-by: Jeff Hostetler <jeffh...@microsoft.com>
---
 string-list.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/string-list.c b/string-list.c
index 45016ad..cd4c4e0 100644
--- a/string-list.c
+++ b/string-list.c
@@ -41,10 +41,8 @@ static int add_entry(int insert_at, struct string_list 
*list, const char *string
        if (exact_match)
                return -1 - index;
 
-       if (list->nr + 1 >= list->alloc) {
-               list->alloc += 32;
-               REALLOC_ARRAY(list->items, list->alloc);
-       }
+       if (list->nr + 1 >= list->alloc)
+               ALLOC_GROW(list->items, list->nr+1, list->alloc);
        if (index < list->nr)
                memmove(list->items + index + 1, list->items + index,
                                (list->nr - index)
-- 
2.9.3