# HG changeset patch
# User Ruslan Ermilov <ru@nginx.com>
# Date 1481138737 -10800
# Node ID f6beb55792de5f5921d2bcd9de5ffe4eca4849e4
# Parent  ea12328518dc1064af2915e26d8b571d9243e2b1
Slab: fixed the number of pages calculation.

When estimating the number of pages, do not count memory for slots.
In some cases this gives one extra usable memory page.

diff --git a/src/core/ngx_slab.c b/src/core/ngx_slab.c
--- a/src/core/ngx_slab.c
+++ b/src/core/ngx_slab.c
@@ -120,6 +120,7 @@ ngx_slab_init(ngx_slab_pool_t *pool)
     }
 
     p += n * sizeof(ngx_slab_page_t);
+    size -= n * sizeof(ngx_slab_page_t);
 
     pages = (ngx_uint_t) (size / (ngx_pagesize + sizeof(ngx_slab_page_t)));