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authorWen Congyang <wency@cn.fujitsu.com>2013-02-23 01:33:31 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-24 02:50:13 +0100
commite13fe8695c57fed678877a9f3f8e99fc637ff4fb (patch)
tree2e5cc485c71054cec7a09920db376443e621eca2 /mm/memory_hotplug.c
parentcpu-hotplug, memory-hotplug: try offlining the node when hotremoving a cpu (diff)
downloadlinux-e13fe8695c57fed678877a9f3f8e99fc637ff4fb.tar.xz
linux-e13fe8695c57fed678877a9f3f8e99fc637ff4fb.zip
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>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c30
1 files changed, 29 insertions, 1 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 17e1447077ab..a9072a16a160 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -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;
/*