From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752955AbaANBvZ (ORCPT ); Mon, 13 Jan 2014 20:51:25 -0500 Received: from mail-pb0-f54.google.com ([209.85.160.54]:36382 "EHLO mail-pb0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752590AbaANBvX (ORCPT ); Mon, 13 Jan 2014 20:51:23 -0500 Date: Mon, 13 Jan 2014 17:50:49 -0800 (PST) From: Hugh Dickins X-X-Sender: hugh@eggly.anvils To: Michal Hocko cc: Johannes Weiner , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/3] mm/memcg: fix last_dead_count memory wastage Message-ID: User-Agent: Alpine 2.11 (LSU 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Shorten mem_cgroup_reclaim_iter.last_dead_count from unsigned long to int: it's assigned from an int and compared with an int, and adjacent to an unsigned int: so there's no point to it being unsigned long, which wasted 104 bytes in every mem_cgroup_per_zone. Signed-off-by: Hugh Dickins --- Putting this one first as it should be nicely uncontroversial. I'm assuming much too late for v3.13, so all 3 diffed against mmotm. mm/memcontrol.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- mmotm/mm/memcontrol.c 2014-01-10 18:25:02.236448954 -0800 +++ linux/mm/memcontrol.c 2014-01-12 22:21:10.700570471 -0800 @@ -149,7 +149,7 @@ struct mem_cgroup_reclaim_iter { * matches memcg->dead_count of the hierarchy root group. */ struct mem_cgroup *last_visited; - unsigned long last_dead_count; + int last_dead_count; /* scan generation, increased every round-trip */ unsigned int generation;