mm: add link from struct lruvec to struct zone

This is the first stage of struct mem_cgroup_zone removal.  Further
patches replace struct mem_cgroup_zone with a pointer to struct lruvec.

If CONFIG_CGROUP_MEM_RES_CTLR=n lruvec_zone() is just container_of().

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 5c4880b..2427706 100644 (file)
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -201,6 +201,9 @@ struct zone_reclaim_stat {
 struct lruvec {
        struct list_head lists[NR_LRU_LISTS];
        struct zone_reclaim_stat reclaim_stat;
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+       struct zone *zone;
+#endif
 };
 
 /* Mask used at gathering information at once (see memcontrol.c) */
@@ -729,6 +732,17 @@ extern int init_currently_empty_zone(struct zone *zone, unsigned long start_pfn,
                                     unsigned long size,
                                     enum memmap_context context);
 
+extern void lruvec_init(struct lruvec *lruvec, struct zone *zone);
+
+static inline struct zone *lruvec_zone(struct lruvec *lruvec)
+{
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+       return lruvec->zone;
+#else
+       return container_of(lruvec, struct zone, lruvec);
+#endif
+}
+
 #ifdef CONFIG_HAVE_MEMORY_PRESENT
 void memory_present(int nid, unsigned long start, unsigned long end);
 #else

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a8abf91..39b2c14 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4738,7 +4738,6 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
 {
        struct mem_cgroup_per_node *pn;
        struct mem_cgroup_per_zone *mz;
-       enum lru_list lru;
        int zone, tmp = node;
        /*
         * This routine is called against possible nodes.
@@ -4756,8 +4755,7 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
 
        for (zone = 0; zone < MAX_NR_ZONES; zone++) {
                mz = &pn->zoneinfo[zone];
-               for_each_lru(lru)
-                       INIT_LIST_HEAD(&mz->lruvec.lists[lru]);
+               lruvec_init(&mz->lruvec, &NODE_DATA(node)->node_zones[zone]);
                mz->usage_in_excess = 0;
                mz->on_tree = false;
                mz->memcg = memcg;

diff --git a/mm/mmzone.c b/mm/mmzone.c
index 7cf7b7d..6830eab 100644 (file)
--- a/mm/mmzone.c
+++ b/mm/mmzone.c
@@ -86,3 +86,17 @@ int memmap_valid_within(unsigned long pfn,
        return 1;
 }
 #endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
+
+void lruvec_init(struct lruvec *lruvec, struct zone *zone)
+{
+       enum lru_list lru;
+
+       memset(lruvec, 0, sizeof(struct lruvec));
+
+       for_each_lru(lru)
+               INIT_LIST_HEAD(&lruvec->lists[lru]);
+
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR
+       lruvec->zone = zone;
+#endif
+}

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8cbfc38..6092f33 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4358,7 +4358,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
        for (j = 0; j < MAX_NR_ZONES; j++) {
                struct zone *zone = pgdat->node_zones + j;
                unsigned long size, realsize, memmap_pages;
-               enum lru_list lru;
 
                size = zone_spanned_pages_in_node(nid, j, zones_size);
                realsize = size - zone_absent_pages_in_node(nid, j,
@@ -4408,12 +4407,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
                zone->zone_pgdat = pgdat;
 
                zone_pcp_init(zone);
-               for_each_lru(lru)
-                       INIT_LIST_HEAD(&zone->lruvec.lists[lru]);
-               zone->lruvec.reclaim_stat.recent_rotated[0] = 0;
-               zone->lruvec.reclaim_stat.recent_rotated[1] = 0;
-               zone->lruvec.reclaim_stat.recent_scanned[0] = 0;
-               zone->lruvec.reclaim_stat.recent_scanned[1] = 0;
+               lruvec_init(&zone->lruvec, zone);
                zap_zone_vm_stats(zone);
                zone->flags = 0;
                if (!size)