Merge pull request libgit2#5172 from bk2204/cache-efficient-eviction

Evict cache items more efficiently

Author: pks-t

src/cache.c

@@ -115,9 +115,12 @@ void git_cache_dispose(git_cache *cache)
 /* Called with lock */
 static void cache_evict_entries(git_cache *cache)
 {
-	size_t evict_count = 8, i;
+	size_t evict_count = git_cache_size(cache) / 2048, i;
 	ssize_t evicted_memory = 0;
 
+	if (evict_count < 8)
+		evict_count = 8;
+
 	/* do not infinite loop if there's not enough entries to evict  */
 	if (evict_count > git_cache_size(cache)) {
 		clear_cache(cache);