[PATCH v7 10/14] arm64/numa: define numa_distance as array to simplify code

Zhen Lei
2016-08-24T07:47:14Z

1. MAX_NUMNODES is base on CONFIG_NODES_SHIFT, the default value of the
latter is very small now.
2. Suppose the default value of MAX_NUMNODES is enlarged to 64, so the
size of numa_distance is 4K, it's still acceptable if run the Image
on other processors.
3. It will make function __node_distance quicker than before.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
arch/arm64/include/asm/numa.h | 1 -
arch/arm64/mm/numa.c | 74 +++----------------------------------------
2 files changed, 5 insertions(+), 70 deletions(-)

diff --git a/arch/arm64/include/asm/numa.h b/arch/arm64/include/asm/numa.h
index 600887e..9b6cc38 100644
--- a/arch/arm64/include/asm/numa.h
+++ b/arch/arm64/include/asm/numa.h
@@ -32,7 +32,6 @@ static inline const struct cpumask *cpumask_of_node(int node)
void __init arm64_numa_init(void);
int __init numa_add_memblk(int nodeid, u64 start, u64 end);
void __init numa_set_distance(int from, int to, int distance);
-void __init numa_free_distance(void);
void __init early_map_cpu_to_node(unsigned int cpu, int nid);
void numa_store_cpu_info(unsigned int cpu);

diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
index 5e44ad1..6853db7 100644
--- a/arch/arm64/mm/numa.c
+++ b/arch/arm64/mm/numa.c
@@ -33,8 +33,7 @@ EXPORT_SYMBOL(node_data);
nodemask_t numa_nodes_parsed __initdata;
static int cpu_to_node_map[NR_CPUS] = { [0 ... NR_CPUS-1] = NUMA_NO_NODE };

-static int numa_distance_cnt;
-static u8 *numa_distance;
+static u8 numa_distance[MAX_NUMNODES][MAX_NUMNODES];
static bool numa_off;

static __init int numa_parse_early_param(char *opt)
@@ -243,59 +242,6 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
}

/**
- * numa_free_distance
- *
- * The current table is freed.
- */
-void __init numa_free_distance(void)
-{
- size_t size;
-
- if (!numa_distance)
- return;
-
- size = numa_distance_cnt * numa_distance_cnt *
- sizeof(numa_distance[0]);
-
- memblock_free(__pa(numa_distance), size);
- numa_distance_cnt = 0;
- numa_distance = NULL;
-}
-
-/**
- *
- * Create a new NUMA distance table.
- *
- */
-static int __init numa_alloc_distance(void)
-{
- size_t size;
- u64 phys;
- int i, j;
-
- size = nr_node_ids * nr_node_ids * sizeof(numa_distance[0]);
- phys = memblock_find_in_range(0, PFN_PHYS(max_pfn),
- size, PAGE_SIZE);
- if (WARN_ON(!phys))
- return -ENOMEM;
-
- memblock_reserve(phys, size);
-
- numa_distance = __va(phys);
- numa_distance_cnt = nr_node_ids;
-
- /* fill with the default distances */
- for (i = 0; i < numa_distance_cnt; i++)
- for (j = 0; j < numa_distance_cnt; j++)
- numa_distance[i * numa_distance_cnt + j] = i == j ?
- LOCAL_DISTANCE : REMOTE_DISTANCE;
-
- pr_debug("Initialized distance table, cnt=%d\n", numa_distance_cnt);
-
- return 0;
-}
-
-/**
* numa_set_distance - Set inter node NUMA distance from node to node.
* @from: the 'from' node to set distance
* @to: the 'to' node to set distance
@@ -310,12 +256,7 @@ static int __init numa_alloc_distance(void)
*/
void __init numa_set_distance(int from, int to, int distance)
{
- if (!numa_distance) {
- pr_warn_once("Warning: distance table not allocated yet\n");
- return;
- }
-
- if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
+ if (from >= MAX_NUMNODES || to >= MAX_NUMNODES ||
from < 0 || to < 0) {
pr_warn_once("Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
from, to, distance);
@@ -329,7 +270,7 @@ void __init numa_set_distance(int from, int to, int distance)
return;
}

- numa_distance[from * numa_distance_cnt + to] = distance;
+ numa_distance[from][to] = distance;
}

/**
@@ -337,9 +278,9 @@ void __init numa_set_distance(int from, int to, int distance)
*/
int __node_distance(int from, int to)
{
- if (from >= numa_distance_cnt || to >= numa_distance_cnt)
+ if (from >= MAX_NUMNODES || to >= MAX_NUMNODES)
return from == to ? LOCAL_DISTANCE : REMOTE_DISTANCE;
- return numa_distance[from * numa_distance_cnt + to];
+ return numa_distance[from][to];
}
EXPORT_SYMBOL(__node_distance);

@@ -379,11 +320,6 @@ static int __init numa_init(int (*init_func)(void))
nodes_clear(numa_nodes_parsed);
nodes_clear(node_possible_map);
nodes_clear(node_online_map);
- numa_free_distance();
-
- ret = numa_alloc_distance();
- if (ret < 0)
- return ret;

ret = init_func();
if (ret < 0)
--
2.5.0