linux-kernel - [PATCH 1/3] mm/memcg: fix last_dead

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Message-ID: <alpine.LSU.2.11.1401131742370.2229@eggly.anvils>
Date:	Mon, 13 Jan 2014 17:50:49 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Michal Hocko <mhocko@...e.cz>
cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] mm/memcg: fix last_dead_count memory wastage

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 <hughd@...gle.com>
---
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;
--
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