try to reuse last 4 free large allocation links

this fixes a pool growing for multi-requests keepalive connections

diff --git a/src/core/ngx_palloc.c b/src/core/ngx_palloc.c
index 3e1c9f2adaabb953399b51e0003ee1d9c3239df6..a3f73f45e643e01facd9b9e827c1b3a8e606d96b 100644 (file)
--- a/src/core/ngx_palloc.c
+++ b/src/core/ngx_palloc.c
@@ -214,6 +214,7 @@ static void *
 ngx_palloc_large(ngx_pool_t *pool, size_t size)
 {
     void              *p;
+    ngx_uint_t         n;
     ngx_pool_large_t  *large;
 
     p = ngx_alloc(size, pool->log);
@@ -221,6 +222,19 @@ ngx_palloc_large(ngx_pool_t *pool, size_t size)
         return NULL;
     }
 
+    n = 0;
+
+    for (large = pool->large; large; large = large->next) {
+        if (large->alloc == NULL) {
+            large->alloc = p;
+            return p;
+        }
+
+        if (n++ > 3) {
+            break;
+        }
+    }
+
     large = ngx_palloc(pool, sizeof(ngx_pool_large_t));
     if (large == NULL) {
         ngx_free(p);