linux-kernel - [PATCH 2/2] memcg: use vm_swappiness from current memcg

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Message-ID: <20120215162834.13902.37262.stgit@zurg>
Date:	Wed, 15 Feb 2012 20:28:34 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>
Cc:	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] memcg: use vm_swappiness from current memcg

At this point this is always the same cgroup, but it allows to drop one argument.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@...nvz.org>
---
 mm/vmscan.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b069fac..751fab3 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1899,12 +1899,11 @@ static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
 	return shrink_inactive_list(nr_to_scan, mz, sc, priority, file);
 }
 
-static int vmscan_swappiness(struct mem_cgroup_zone *mz,
-			     struct scan_control *sc)
+static int vmscan_swappiness(struct scan_control *sc)
 {
 	if (global_reclaim(sc))
 		return vm_swappiness;
-	return mem_cgroup_swappiness(mz->mem_cgroup);
+	return mem_cgroup_swappiness(sc->current_mem_cgroup);
 }
 
 /*
@@ -1972,8 +1971,8 @@ static void get_scan_count(struct mem_cgroup_zone *mz, struct scan_control *sc,
 	 * With swappiness at 100, anonymous and file have the same priority.
 	 * This scanning priority is essentially the inverse of IO cost.
 	 */
-	anon_prio = vmscan_swappiness(mz, sc);
-	file_prio = 200 - vmscan_swappiness(mz, sc);
+	anon_prio = vmscan_swappiness(sc);
+	file_prio = 200 - vmscan_swappiness(sc);
 
 	/*
 	 * OK, so we have swap space and a fair amount of page cache

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