# HG changeset patch
# User Valentin Bartenev <vbart@nginx.com>
# Date 1327917699 0
# Node ID 7084faa7a4b4c45335bf06b8765a38549dc43b0e
# Parent  aac79fc948cc28a464218bf207d7f4a4e058f42b
Limit req: number of cleanup calls reduced.

Doing a cleanup before every lookup seems to be too aggressive. It can lead to
premature removal of the nodes still usable, which increases the amount of work
under a mutex lock and therefore decreases performance.

In order to improve cleanup behavior, cleanup function call has been moved right
before the allocation of a new node.

diff --git a/src/http/modules/ngx_http_limit_req_module.c b/src/http/modules/ngx_http_limit_req_module.c
--- a/src/http/modules/ngx_http_limit_req_module.c
+++ b/src/http/modules/ngx_http_limit_req_module.c
@@ -182,8 +182,6 @@ ngx_http_limit_req_handler(ngx_http_requ
 
     ngx_shmtx_lock(&ctx->shpool->mutex);
 
-    ngx_http_limit_req_expire(ctx, 1);
-
     rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &excess);
 
     ngx_shmtx_unlock(&ctx->shpool->mutex);
@@ -385,6 +383,8 @@ ngx_http_limit_req_lookup(ngx_http_limit
            + offsetof(ngx_http_limit_req_node_t, data)
            + len;
 
+    ngx_http_limit_req_expire(ctx, 1);
+
     node = ngx_slab_alloc_locked(ctx->shpool, size);
 
     if (node == NULL) {