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[PATCH v8 10/16] mm/memblock: add a new function memblock_alloc_near_nid

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If HAVE_MEMORYLESS_NODES is selected, and some memoryless numa nodes are
actually exist. The percpu variable areas and numa control blocks of that
memoryless numa nodes must be allocated from the nearest available node
to improve performance.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
 include/linux/memblock.h |  1 +
 mm/memblock.c            | 28 ++++++++++++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 2925da2..8e866e0 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -290,6 +290,7 @@ static inline int memblock_get_region_node(const struct memblock_region *r)

 phys_addr_t memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid);
 phys_addr_t memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
+phys_addr_t memblock_alloc_near_nid(phys_addr_t size, phys_addr_t align, int nid);

 phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align);

diff --git a/mm/memblock.c b/mm/memblock.c
index 483197e..6578fff 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1189,6 +1189,34 @@ again:
 	return ret;
 }

+phys_addr_t __init memblock_alloc_near_nid(phys_addr_t size, phys_addr_t align, int nid)
+{
+	int i, best_nid, distance;
+	u64 pa;
+	DECLARE_BITMAP(nodes_map, MAX_NUMNODES);
+
+	bitmap_zero(nodes_map, MAX_NUMNODES);
+
+find_nearest_node:
+	best_nid = NUMA_NO_NODE;
+	distance = INT_MAX;
+
+	for_each_clear_bit(i, nodes_map, MAX_NUMNODES)
+		if (node_distance(nid, i) < distance) {
+			best_nid = i;
+			distance = node_distance(nid, i);
+		}
+
+	pa = memblock_alloc_nid(size, align, best_nid);
+	if (!pa) {
+		BUG_ON(best_nid == NUMA_NO_NODE);
+		bitmap_set(nodes_map, best_nid, 1);
+		goto find_nearest_node;
+	}
+
+	return pa;
+}
+
 phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
 {
 	return memblock_alloc_base_nid(size, align, max_addr, NUMA_NO_NODE,
--
2.5.0

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[PATCH v8 00/16] fix some type infos and bugs for arm64/of numa Zhen Lei <thunder.leizhen@huawei.com> - 2016-09-01 09:00 +0200
  [PATCH v8 05/16] arm64/numa: avoid inconsistent information to be printed Zhen Lei <thunder.leizhen@huawei.com> - 2016-09-01 09:00 +0200
  [PATCH v8 07/16] of_numa: Use pr_fmt() Zhen Lei <thunder.leizhen@huawei.com> - 2016-09-01 09:00 +0200
  [PATCH v8 04/16] of/numa: remove a duplicated warning Zhen Lei <thunder.leizhen@huawei.com> - 2016-09-01 09:00 +0200
  [PATCH v8 10/16] mm/memblock: add a new function memblock_alloc_near_nid Zhen Lei <thunder.leizhen@huawei.com> - 2016-09-01 09:00 +0200
    Re: [PATCH v8 10/16] mm/memblock: add a new function  memblock_alloc_near_nid "Leizhen (ThunderTown)" <thunder.leizhen@huawei.com> - 2016-09-09 06:00 +0200
  [PATCH v8 12/16] arm64/numa: remove some useless code Zhen Lei <thunder.leizhen@huawei.com> - 2016-09-01 09:00 +0200
  [PATCH v8 06/16] of_numa: Use of_get_next_parent to simplify code Zhen Lei <thunder.leizhen@huawei.com> - 2016-09-01 09:00 +0200
  [PATCH v8 16/16] arm64/numa: define numa_distance as array to simplify code Zhen Lei <thunder.leizhen@huawei.com> - 2016-09-01 09:00 +0200
  [PATCH v8 01/16] of/numa: remove a duplicated pr_debug information Zhen Lei <thunder.leizhen@huawei.com> - 2016-09-01 09:10 +0200
  [PATCH v8 02/16] of/numa: fix a memory@ node can only contains one memory block Zhen Lei <thunder.leizhen@huawei.com> - 2016-09-01 09:10 +0200
  Re: [PATCH v8 00/16] fix some type infos and bugs for arm64/of numa Will Deacon <will.deacon@arm.com> - 2016-09-08 13:10 +0200
    Re: [PATCH v8 00/16] fix some type infos and bugs for arm64/of numa "Leizhen (ThunderTown)" <thunder.leizhen@huawei.com> - 2016-09-09 04:10 +0200

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