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Subject[PATCH v2 09/13] x86, numa, memblock: Introduce MEMBLK_LOCAL_NODE to mark and reserve node-life-cycle data.
Date
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@cn.fujitsu.com>
---
arch/x86/mm/init.c | 16 ++++++++++++----
include/linux/memblock.h | 2 ++
mm/memblock.c | 7 +++++++
3 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 8d0007a..002d487 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 5064eed..3b2d1c4 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -23,6 +23,7 @@

/* Definition of memblock flags. */
enum memblock_flags {
+ MEMBLK_LOCAL_NODE, /* node-life-cycle data */
__NR_MEMBLK_FLAGS, /* number of flags */
};

@@ -65,6 +66,7 @@ int memblock_add(phys_addr_t base, phys_addr_t size);
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_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 1b93a5d..edde4c2 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -589,6 +589,13 @@ 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)
+{
+ unsigned long flags = 1 << MEMBLK_LOCAL_NODE;
+ return memblock_reserve_region(base, size, nid, flags);
+}
+
/**
* __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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