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Subject[PATCH v5 3/5] page_alloc: Introduce zone_movable_limit[] to keep movable limit for nodes
Date
This patch introduces a new array zone_movable_limit[] to store the
ZONE_MOVABLE limit from movablecore_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.

change log:
Do find_usable_zone_for_movable() to initialize movable_zone
so that sanitize_zone_movable_limit() could use it.

Reported-by: Wu Jianguo <wujianguo@huawei.com>

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>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Tested-by: Lin Feng <linfeng@cn.fujitsu.com>
---
mm/page_alloc.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 78 insertions(+), 1 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d1a7a88..093b953 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -209,6 +209,7 @@ 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;
@@ -4370,6 +4371,77 @@ 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 movablecore_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 (!movablecore_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 < movablecore_map.nr_map) {
+ if (end_pfn <= movablecore_map.map[map_pos].start_pfn)
+ break;
+
+ if (start_pfn >= movablecore_map.map[map_pos].end_pfn) {
+ map_pos++;
+ continue;
+ }
+
+ /*
+ * The start_pfn of ZONE_MOVABLE is either the minimum
+ * pfn specified by movablecore_map, or 0, which means
+ * the node has no ZONE_MOVABLE.
+ */
+ zone_movable_limit[nid] = max(start_pfn,
+ movablecore_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,
@@ -4388,6 +4460,10 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid,
return zholes_size[zone_type];
}

+static void __meminit sanitize_zone_movable_limit(void)
+{
+}
+
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */

static void __meminit calculate_node_totalpages(struct pglist_data *pgdat,
@@ -4831,7 +4907,6 @@ 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:
@@ -4990,6 +5065,8 @@ 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 */
--
1.7.1


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