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authorTang Chen <tangchen@cn.fujitsu.com>2014-01-21 15:49:32 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-21 16:19:45 -0800
commita0acda917284183f9b71e2d08b0aa0aea722b321 (patch)
tree70a2f3a7a1afe198eedf5e3e000e5745d57cbd22 /arch
parent05d1d8cb1c7c25b7c7197817b3418524ace61372 (diff)
acpi, numa, mem_hotplug: mark all nodes the kernel resides un-hotpluggable
At very early time, the kernel have to use some memory such as loading the kernel image. We cannot prevent this anyway. So any node the kernel resides in should be un-hotpluggable. Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Reviewed-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: "Rafael J . Wysocki" <rjw@sisk.pl> Cc: Chen Tang <imtangchen@gmail.com> Cc: Gong Chen <gong.chen@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jiang Liu <jiang.liu@huawei.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Larry Woodman <lwoodman@redhat.com> Cc: Len Brown <lenb@kernel.org> Cc: Liu Jiang <jiang.liu@huawei.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Michal Nazarewicz <mina86@mina86.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Taku Izumi <izumi.taku@jp.fujitsu.com> Cc: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Thomas Renninger <trenn@suse.de> Cc: Toshi Kani <toshi.kani@hp.com> Cc: Vasilis Liaskovitis <vasilis.liaskovitis@profitbricks.com> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Cc: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/mm/numa.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 78d6a9e5830..81b2750f366 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -493,6 +493,14 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
struct numa_memblk *mb = &mi->blk[i];
memblock_set_node(mb->start, mb->end - mb->start,
&memblock.memory, mb->nid);
+
+ /*
+ * At this time, all memory regions reserved by memblock are
+ * used by the kernel. Set the nid in memblock.reserved will
+ * mark out all the nodes the kernel resides in.
+ */
+ memblock_set_node(mb->start, mb->end - mb->start,
+ &memblock.reserved, mb->nid);
}
/*
@@ -554,6 +562,30 @@ static void __init numa_init_array(void)
}
}
+static void __init numa_clear_kernel_node_hotplug(void)
+{
+ int i, nid;
+ nodemask_t numa_kernel_nodes;
+ unsigned long start, end;
+ struct memblock_type *type = &memblock.reserved;
+
+ /* Mark all kernel nodes. */
+ for (i = 0; i < type->cnt; i++)
+ node_set(type->regions[i].nid, numa_kernel_nodes);
+
+ /* Clear MEMBLOCK_HOTPLUG flag for memory in kernel nodes. */
+ for (i = 0; i < numa_meminfo.nr_blks; i++) {
+ nid = numa_meminfo.blk[i].nid;
+ if (!node_isset(nid, numa_kernel_nodes))
+ continue;
+
+ start = numa_meminfo.blk[i].start;
+ end = numa_meminfo.blk[i].end;
+
+ memblock_clear_hotplug(start, end - start);
+ }
+}
+
static int __init numa_init(int (*init_func)(void))
{
int i;
@@ -568,6 +600,8 @@ static int __init numa_init(int (*init_func)(void))
memset(&numa_meminfo, 0, sizeof(numa_meminfo));
WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.memory,
MAX_NUMNODES));
+ WARN_ON(memblock_set_node(0, ULLONG_MAX, &memblock.reserved,
+ MAX_NUMNODES));
/* In case that parsing SRAT failed. */
WARN_ON(memblock_clear_hotplug(0, ULLONG_MAX));
numa_reset_distance();
@@ -605,6 +639,16 @@ static int __init numa_init(int (*init_func)(void))
numa_clear_node(i);
}
numa_init_array();
+
+ /*
+ * At very early time, the kernel have to use some memory such as
+ * loading the kernel image. We cannot prevent this anyway. So any
+ * node the kernel resides in should be un-hotpluggable.
+ *
+ * And when we come here, numa_init() won't fail.
+ */
+ numa_clear_kernel_node_hotplug();
+
return 0;
}