Since node info in SRAT may not be in increasing order, we may meet
a lower range after we handled a higher range. So we need to keep
the lowest movable pfn each time we parse a SRAT memory entry, and
update it when we get a lower one.
This patch introduces a new array zone_movable_limit[], which is used
to store the start pfn of each node's ZONE_MOVABLE.
We update it each time we parsed a SRAT memory entry if necessary.
Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
---
arch/x86/mm/numa.c | 16 ++++++++++++++--
include/linux/mm.h | 2 ++
mm/page_alloc.c | 1 +
3 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index dcaf248..8cbe8a0 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -727,7 +727,8 @@ static void __init early_x86_numa_init_mapping(void)
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
/**
- * early_mem_hotplug_init - Add hotpluggable memory ranges to movablemem_map.
+ * early_mem_hotplug_init - Add hotpluggable memory ranges to movablemem_mapi,
+ * and initialize zone_movable_limit.
*
* This function scan numa_meminfo.blk[], and add all the hotpluggable memory
* ranges to movablemem_map. movablemem_map can be used to prevent memblock
@@ -750,6 +751,10 @@ static void __init early_x86_numa_init_mapping(void)
* hotpluggable: y y y n
* kernel resides in: y n n n
* movablemem_map: |_____| |_________|
+ *
+ * This function will also initialize zone_movable_limit[].
+ * ZONE_MOVABLE of node i should start at least from zone_movable_limit[i].
+ * zone_movable_limit[i] == 0 means there is no limitation for node i.
*/
static void __init early_mem_hotplug_init()
{
@@ -759,7 +764,7 @@ static void __init early_mem_hotplug_init()
return;
for (i = 0; i < numa_meminfo.nr_blks; i++) {
- nid = numa_meminfo_all.blk[i].nid;
+ nid = numa_meminfo.blk[i].nid;
if (node_isset(nid, movablemem_map.numa_nodes_kernel) ||
!numa_meminfo.blk[i].hotpluggable)
@@ -767,6 +772,13 @@ static void __init early_mem_hotplug_init()
movablemem_map_add_region(numa_meminfo.blk[i].start,
numa_meminfo.blk[i].end);
+
+ if (zone_movable_limit[nid])
+ zone_movable_limit[nid] = min(zone_movable_limit[nid],
+ PFN_DOWN(numa_meminfo.blk[i].start));
+ else
+ zone_movable_limit[nid] =
+ PFN_DOWN(numa_meminfo.blk[i].start);
}
}
#else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2835c91..b313d83 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1349,6 +1349,8 @@ extern struct movablemem_map movablemem_map;
extern void __init movablemem_map_add_region(u64 start, u64 size);
+extern unsigned long __meminitdata zone_movable_limit[MAX_NUMNODES];
+
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
#if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2a7904f..b97bdb5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -213,6 +213,7 @@ 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];
+unsigned long __meminitdata zone_movable_limit[MAX_NUMNODES];
/* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */
int movable_zone;
--
1.7.1
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