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authorTang Chen <tangchen@cn.fujitsu.com>2013-02-22 16:33:39 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-23 17:50:14 -0800
commit6981ec31146cf19454c55c130625f6cee89aab95 (patch)
treec7f54f81d45c499103268ab95b88d0d617be9c59 /mm/page_alloc.c
parent34b71f1e04fcba578e719e675b4882eeeb2a1f6f (diff)
downloadlinux-6981ec31146cf19454c55c130625f6cee89aab95.tar.gz
page_alloc: introduce zone_movable_limit[] to keep movable limit for nodes
Introduce a new array zone_movable_limit[] to store the ZONE_MOVABLE limit from movablemem_map boot option for all nodes. The function sanitize_zone_movable_limit() will find out to which node the ranges in movable_map.map[] belongs, and calculates the low boundary of ZONE_MOVABLE for each node. Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Signed-off-by: Liu Jiang <jiang.liu@huawei.com> Reviewed-by: Wen Congyang <wency@cn.fujitsu.com> Cc: Wu Jianguo <wujianguo@huawei.com> Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com> Tested-by: Lin Feng <linfeng@cn.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c76
1 files changed, 74 insertions, 2 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index aa1cc5fe990..0f267d9c73f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -210,6 +210,7 @@ static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
static unsigned long __initdata required_kernelcore;
static unsigned long __initdata required_movablecore;
static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES];
+static unsigned long __meminitdata zone_movable_limit[MAX_NUMNODES];
/* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
int movable_zone;
@@ -4375,6 +4376,77 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn);
}
+/**
+ * sanitize_zone_movable_limit - Sanitize the zone_movable_limit array.
+ *
+ * zone_movable_limit is initialized as 0. This function will try to get
+ * the first ZONE_MOVABLE pfn of each node from movablemem_map, and
+ * assigne them to zone_movable_limit.
+ * zone_movable_limit[nid] == 0 means no limit for the node.
+ *
+ * Note: Each range is represented as [start_pfn, end_pfn)
+ */
+static void __meminit sanitize_zone_movable_limit(void)
+{
+ int map_pos = 0, i, nid;
+ unsigned long start_pfn, end_pfn;
+
+ if (!movablemem_map.nr_map)
+ return;
+
+ /* Iterate all ranges from minimum to maximum */
+ for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid) {
+ /*
+ * If we have found lowest pfn of ZONE_MOVABLE of the node
+ * specified by user, just go on to check next range.
+ */
+ if (zone_movable_limit[nid])
+ continue;
+
+#ifdef CONFIG_ZONE_DMA
+ /* Skip DMA memory. */
+ if (start_pfn < arch_zone_highest_possible_pfn[ZONE_DMA])
+ start_pfn = arch_zone_highest_possible_pfn[ZONE_DMA];
+#endif
+
+#ifdef CONFIG_ZONE_DMA32
+ /* Skip DMA32 memory. */
+ if (start_pfn < arch_zone_highest_possible_pfn[ZONE_DMA32])
+ start_pfn = arch_zone_highest_possible_pfn[ZONE_DMA32];
+#endif
+
+#ifdef CONFIG_HIGHMEM
+ /* Skip lowmem if ZONE_MOVABLE is highmem. */
+ if (zone_movable_is_highmem() &&
+ start_pfn < arch_zone_lowest_possible_pfn[ZONE_HIGHMEM])
+ start_pfn = arch_zone_lowest_possible_pfn[ZONE_HIGHMEM];
+#endif
+
+ if (start_pfn >= end_pfn)
+ continue;
+
+ while (map_pos < movablemem_map.nr_map) {
+ if (end_pfn <= movablemem_map.map[map_pos].start_pfn)
+ break;
+
+ if (start_pfn >= movablemem_map.map[map_pos].end_pfn) {
+ map_pos++;
+ continue;
+ }
+
+ /*
+ * The start_pfn of ZONE_MOVABLE is either the minimum
+ * pfn specified by movablemem_map, or 0, which means
+ * the node has no ZONE_MOVABLE.
+ */
+ zone_movable_limit[nid] = max(start_pfn,
+ movablemem_map.map[map_pos].start_pfn);
+
+ break;
+ }
+ }
+}
+
#else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
static inline unsigned long __meminit zone_spanned_pages_in_node(int nid,
unsigned long zone_type,
@@ -4392,7 +4464,6 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
return zholes_size[zone_type];
}
-
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
@@ -4839,7 +4910,6 @@ static void __init find_zone_movable_pfns_for_nodes(void)
goto out;
/* usable_startpfn is the lowest possible pfn ZONE_MOVABLE can be at */
- find_usable_zone_for_movable();
usable_startpfn = arch_zone_lowest_possible_pfn[movable_zone];
restart:
@@ -4998,6 +5068,8 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
/* Find the PFNs that ZONE_MOVABLE begins at in each node */
memset(zone_movable_pfn, 0, sizeof(zone_movable_pfn));
+ find_usable_zone_for_movable();
+ sanitize_zone_movable_limit();
find_zone_movable_pfns_for_nodes();
/* Print out the zone ranges */