node-life-cycle data (whose life cycle is the same as a node)
allocated by memblock should be marked so that when we free usable
memory to buddy system, we can skip them.
This patch introduces a flag MEMBLK_LOCAL_NODE for memblock to reserve
node-life-cycle data. For now, it is only kernel direct mapping pagetable
pages, based on Yinghai's patch.
Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
---
arch/x86/mm/init.c | 16 ++++++++++++----
include/linux/memblock.h | 2 ++
mm/memblock.c | 6 ++++++
3 files changed, 20 insertions(+), 4 deletions(-)
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 9ff71ff..63abb46 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -62,14 +62,22 @@ __ref void *alloc_low_pages(unsigned int num)
low_min_pfn_mapped << PAGE_SHIFT,
low_max_pfn_mapped << PAGE_SHIFT,
PAGE_SIZE * num , PAGE_SIZE);
- } else
+ if (!ret)
+ panic("alloc_low_page: can not alloc memory");
+
+ memblock_reserve(ret, PAGE_SIZE * num);
+ } else {
ret = memblock_find_in_range(
local_min_pfn_mapped << PAGE_SHIFT,
local_max_pfn_mapped << PAGE_SHIFT,
PAGE_SIZE * num , PAGE_SIZE);
- if (!ret)
- panic("alloc_low_page: can not alloc memory");
- memblock_reserve(ret, PAGE_SIZE * num);
+ if (!ret)
+ panic("alloc_low_page: can not alloc memory");
+
+ memblock_reserve_local_node(ret, PAGE_SIZE * num,
+ memory_add_physaddr_to_nid(ret));
+ }
+
pfn = ret >> PAGE_SHIFT;
} else {
pfn = pgt_buf_end;
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 5a52f37..517c027 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -21,6 +21,7 @@
/* Definition of memblock flags. */
#define MEMBLK_FLAGS_DEFAULT 0x0 /* default flag */
+#define MEMBLK_LOCAL_NODE 0x1 /* node-life-cycle data */
struct memblock_region {
phys_addr_t base;
@@ -62,6 +63,7 @@ int memblock_remove(phys_addr_t base, phys_addr_t size);
int memblock_free(phys_addr_t base, phys_addr_t size);
int memblock_reserve(phys_addr_t base, phys_addr_t size);
int memblock_reserve_node(phys_addr_t base, phys_addr_t size, int nid);
+int memblock_reserve_local_node(phys_addr_t base, phys_addr_t size, int nid);
void memblock_trim_memory(phys_addr_t align);
void memblock_mark_kernel_nodes(void);
diff --git a/mm/memblock.c b/mm/memblock.c
index bb53c54..e747bc6 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -597,6 +597,12 @@ int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
MEMBLK_FLAGS_DEFAULT);
}
+int __init_memblock memblock_reserve_local_node(phys_addr_t base,
+ phys_addr_t size, int nid)
+{
+ return memblock_reserve_region(base, size, nid, MEMBLK_LOCAL_NODE);
+}
+
/**
* __next_free_mem_range - next function for for_each_free_mem_range()
* @idx: pointer to u64 loop variable
--
1.7.1
--
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