lkml.org 
[lkml]   [2009]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/mm] x86, mm: Fix node_possible_map logic
Commit-ID:  7c43769a9776141ec23ca81a1bdd5a9c0512f165
Gitweb: http://git.kernel.org/tip/7c43769a9776141ec23ca81a1bdd5a9c0512f165
Author: Yinghai Lu <yinghai@kernel.org>
AuthorDate: Fri, 15 May 2009 13:59:37 -0700
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Mon, 18 May 2009 09:21:04 +0200

x86, mm: Fix node_possible_map logic

Recently there were some changes to the meaning of node_possible_map,
and it is quite strange:

- the node without memory would be set in node_possible_map
- but some node with less NODE_MIN_SIZE will be kicked out of node_possible_map.

fix it by adding strict_setup_node_bootmem().

Also, remove unparse_node().

so result will be:

1. cpu_to_node() will return online node only (nearest one)
2. apicid_to_node() still returns the node that could be not online but is set
in node_possible_map.
3. node_possible_map will include nodes that mem on it are less NODE_MIN_SIZE

v2: after move_cpus_to_node change.

[ Impact: get node_possible_map right ]

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Tested-by: Jack Steiner <steiner@sgi.com>
LKML-Reference: <4A0C49BE.6080800@kernel.org>
[ v3: various small cleanups and comment clarifications ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
arch/x86/include/asm/numa_64.h | 7 +++++++
arch/x86/mm/numa_64.c | 13 ++++++++++---
arch/x86/mm/srat_64.c | 29 ++---------------------------
3 files changed, 19 insertions(+), 30 deletions(-)
diff --git a/arch/x86/include/asm/numa_64.h b/arch/x86/include/asm/numa_64.h
index 7feff06..c4ae822 100644
--- a/arch/x86/include/asm/numa_64.h
+++ b/arch/x86/include/asm/numa_64.h
@@ -24,6 +24,13 @@ extern void setup_node_bootmem(int nodeid, unsigned long start,
unsigned long end);

#ifdef CONFIG_NUMA
+/*
+ * Too small node sizes may confuse the VM badly. Usually they
+ * result from BIOS bugs. So dont recognize nodes as standalone
+ * NUMA entities that have less than this amount of RAM listed:
+ */
+#define NODE_MIN_SIZE (4*1024*1024)
+
extern void __init init_cpu_to_node(void);
extern void __cpuinit numa_set_node(int cpu, int node);
extern void __cpuinit numa_clear_node(int cpu);
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index a6a93c3..459913b 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -179,18 +179,25 @@ static void * __init early_node_mem(int nodeid, unsigned long start,
}

/* Initialize bootmem allocator for a node */
-void __init setup_node_bootmem(int nodeid, unsigned long start,
- unsigned long end)
+void __init
+setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
{
unsigned long start_pfn, last_pfn, bootmap_pages, bootmap_size;
+ const int pgdat_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
unsigned long bootmap_start, nodedata_phys;
void *bootmap;
- const int pgdat_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
int nid;

if (!end)
return;

+ /*
+ * Don't confuse VM with a node that doesn't have the
+ * minimum amount of memory:
+ */
+ if (end && (end - start) < NODE_MIN_SIZE)
+ return;
+
start = roundup(start, ZONE_ALIGN);

printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid,
diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index b0dbbd4..2dfcbf9 100644
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -36,10 +36,6 @@ static int num_node_memblks __initdata;
static struct bootnode node_memblk_range[NR_NODE_MEMBLKS] __initdata;
static int memblk_nodeid[NR_NODE_MEMBLKS] __initdata;

-/* Too small nodes confuse the VM badly. Usually they result
- from BIOS bugs. */
-#define NODE_MIN_SIZE (4*1024*1024)
-
static __init int setup_node(int pxm)
{
return acpi_map_pxm_to_node(pxm);
@@ -338,17 +334,6 @@ static int __init nodes_cover_memory(const struct bootnode *nodes)
return 1;
}

-static void __init unparse_node(int node)
-{
- int i;
- node_clear(node, nodes_parsed);
- node_clear(node, cpu_nodes_parsed);
- for (i = 0; i < MAX_LOCAL_APIC; i++) {
- if (apicid_to_node[i] == node)
- apicid_to_node[i] = NUMA_NO_NODE;
- }
-}
-
void __init acpi_numa_arch_fixup(void) {}

/* Use the information discovered above to actually set up the nodes. */
@@ -360,18 +345,8 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
return -1;

/* First clean up the node list */
- for (i = 0; i < MAX_NUMNODES; i++) {
+ for (i = 0; i < MAX_NUMNODES; i++)
cutoff_node(i, start, end);
- /*
- * don't confuse VM with a node that doesn't have the
- * minimum memory.
- */
- if (nodes[i].end &&
- (nodes[i].end - nodes[i].start) < NODE_MIN_SIZE) {
- unparse_node(i);
- node_set_offline(i);
- }
- }

if (!nodes_cover_memory(nodes)) {
bad_srat();
@@ -404,7 +379,7 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)

if (node == NUMA_NO_NODE)
continue;
- if (!node_isset(node, node_possible_map))
+ if (!node_online(node))
numa_clear_node(i);
}
numa_init_array();

\
 
 \ /
  Last update: 2009-05-18 09:43    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean