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authorMichal Hocko <mhocko@suse.com>2017-07-06 15:37:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-06 16:24:32 -0700
commit9037a9934349b0e180896fc8cacaf1819418ba03 (patch)
treeafbd5f9c4cfd3c61c1788c03199dc5bf9619dd2a /mm
parent1b862aecfbd419cdc4553645bf86d07554279bed (diff)
mm, memory_hotplug: split up register_one_node()
Memory hotplug (add_memory_resource) has to reinitialize node infrastructure if the node is offline (one which went through the complete add_memory(); remove_memory() cycle). That involves node registration to the kobj infrastructure (register_node), the proper association with cpus (register_cpu_under_node) and finally creation of node<->memblock symlinks (link_mem_sections). The last part requires to know node_start_pfn and node_spanned_pages which we currently have but a leter patch will postpone this initialization to the onlining phase which happens later. In fact we do not need to rely on the early pgdat initialization even now because the currently hot added pfn range is currently known. Split register_one_node into core which does all the common work for the boot time NUMA initialization and the hotplug (__register_one_node). register_one_node keeps the full initialization while hotplug calls __register_one_node and manually calls link_mem_sections for the proper range. This shouldn't introduce any functional change. Link: http://lkml.kernel.org/r/20170515085827.16474-6-mhocko@kernel.org Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Andi Kleen <ak@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Daniel Kiper <daniel.kiper@oracle.com> Cc: David Rientjes <rientjes@google.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Igor Mammedov <imammedo@redhat.com> Cc: Jerome Glisse <jglisse@redhat.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Reza Arbab <arbab@linux.vnet.ibm.com> Cc: Tobias Regnery <tobias.regnery@gmail.com> Cc: Toshi Kani <toshi.kani@hpe.com> Cc: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: Xishi Qiu <qiuxishi@huawei.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memory_hotplug.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index c0147d3024eb..caa58338d121 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1388,7 +1388,22 @@ int __ref add_memory_resource(int nid, struct resource *res, bool online)
node_set_online(nid);
if (new_node) {
- ret = register_one_node(nid);
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+
+ ret = __register_one_node(nid);
+ if (ret)
+ goto register_fail;
+
+ /*
+ * link memory sections under this node. This is already
+ * done when creatig memory section in register_new_memory
+ * but that depends to have the node registered so offline
+ * nodes have to go through register_node.
+ * TODO clean up this mess.
+ */
+ ret = link_mem_sections(nid, start_pfn, nr_pages);
+register_fail:
/*
* If sysfs file of new node can't create, cpu on the node
* can't be hot-added. There is no rollback way now.