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authorYinghai Lu <yinghai@kernel.org>2009-05-15 13:59:37 -0700
committerIngo Molnar <mingo@elte.hu>2009-05-18 09:21:04 +0200
commit7c43769a9776141ec23ca81a1bdd5a9c0512f165 (patch)
treee24d99a84d76386b0bf910152d1841853857e63f /arch/x86/include/asm/numa_64.h
parent888a589f6be07d624e21e2174d98375e9f95911b (diff)
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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>
Diffstat (limited to 'arch/x86/include/asm/numa_64.h')
-rw-r--r--arch/x86/include/asm/numa_64.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/include/asm/numa_64.h b/arch/x86/include/asm/numa_64.h
index 7feff0648d74..c4ae822e415f 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);