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cpu-hotplug,memory-hotplug: clear cpu_to_node() when offlining the node 

When the node is offlined, there is no memory/cpu on the node.  If a
sleep task runs on a cpu of this node, it will be migrated to the cpu on
the other node.  So we can clear cpu-to-node mapping.

[akpm@linux-foundation.org: numa_clear_node() and numa_set_node() can no longer be __cpuinit]
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wen Congyang 2013-02-22 16:33:31 -08:00 committed by Linus Torvalds
parent 76bba1423f
commit e13fe8695c
3 changed files with 33 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/include/asm/numa.h
View File

@ -57,8 +57,8 @@ static inline int numa_cpu_node(int cpu)
#endif
#ifdef CONFIG_NUMA
extern void __cpuinit numa_set_node(int cpu, int node);
extern void __cpuinit numa_clear_node(int cpu);
extern void numa_set_node(int cpu, int node);
extern void numa_clear_node(int cpu);
extern void __init init_cpu_to_node(void);
extern void __cpuinit numa_add_cpu(int cpu);
extern void __cpuinit numa_remove_cpu(int cpu);

4
arch/x86/mm/numa.c
View File

@ -78,7 +78,7 @@ EXPORT_SYMBOL(node_to_cpumask_map);
DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
void __cpuinit numa_set_node(int cpu, int node)
void numa_set_node(int cpu, int node)
{
int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
@ -101,7 +101,7 @@ void __cpuinit numa_set_node(int cpu, int node)
set_cpu_numa_node(cpu, node);
}
void __cpuinit numa_clear_node(int cpu)
void numa_clear_node(int cpu)
{
numa_set_node(cpu, NUMA_NO_NODE);
}

30
mm/memory_hotplug.c
View File

@ -1705,6 +1705,34 @@ static int check_cpu_on_node(void *data)
return 0;
}
static void unmap_cpu_on_node(void *data)
{
#ifdef CONFIG_ACPI_NUMA
struct pglist_data *pgdat = data;
int cpu;
for_each_possible_cpu(cpu)
if (cpu_to_node(cpu) == pgdat->node_id)
numa_clear_node(cpu);
#endif
}
static int check_and_unmap_cpu_on_node(void *data)
{
int ret = check_cpu_on_node(data);
if (ret)
return ret;
/*
* the node will be offlined when we come here, so we can clear
* the cpu_to_node() now.
*/
unmap_cpu_on_node(data);
return 0;
}
/* offline the node if all memory sections of this node are removed */
void try_offline_node(int nid)
{
@ -1731,7 +1759,7 @@ void try_offline_node(int nid)
return;
}
if (stop_machine(check_cpu_on_node, pgdat, NULL))
if (stop_machine(check_and_unmap_cpu_on_node, pgdat, NULL))
return;
/*