The patch titled
Subject: mm/memory_hotplug: just build zonelist for newly added node
has been added to the -mm tree. Its filename is
mm-memory_hotplug-just-build-zonelist-for-new-added-node.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-just-build-zonelist-for-new-added-node.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-just-build-zonelist-for-new-added-node.patch
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: mm/memory_hotplug: just build zonelist for newly added node
9adb62a5df9c0fbef7 ("mm/hotplug: correctly setup fallback zonelists when
creating new pgdat") tries to build the correct zonelist for a newly added
node, while it is not necessary to rebuild it for already exist nodes.
In build_zonelists(), it will iterate on nodes with memory. For a newly
added node, it will have memory until node_states_set_node() is called in
online_pages().
This patch avoids rebuilding the zonelists for already existing nodes.
Link: http://lkml.kernel.org/r/20170626035822.50155-1-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Jiang Liu <liuj97@xxxxxxxxx>
Cc: Xishi Qiu <qiuxishi@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff -puN mm/page_alloc.c~mm-memory_hotplug-just-build-zonelist-for-new-added-node mm/page_alloc.c
--- a/mm/page_alloc.c~mm-memory_hotplug-just-build-zonelist-for-new-added-node
+++ a/mm/page_alloc.c
@@ -5205,15 +5205,17 @@ static int __build_all_zonelists(void *d
memset(node_load, 0, sizeof(node_load));
#endif
- if (self && !node_online(self->node_id)) {
+ /* This node is hotadded and no memory preset yet.
+ * So just build zonelists is fine, no need to touch other nodes.
+ */
+ if (self && !node_online(self->node_id))
build_zonelists(self);
- }
+ else
+ for_each_online_node(nid) {
+ pg_data_t *pgdat = NODE_DATA(nid);
- for_each_online_node(nid) {
- pg_data_t *pgdat = NODE_DATA(nid);
-
- build_zonelists(pgdat);
- }
+ build_zonelists(pgdat);
+ }
/*
* Initialize the boot_pagesets that are going to be used
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
mm-slub-remove-a-redundant-assignment-in-___slab_alloc.patch
mm-slub-reset-cpu_slabs-pointer-in-deactivate_slab.patch
mm-slub-pack-red_left_pad-with-another-int-to-save-a-word.patch
mm-slub-wrap-cpu_slab-partial-in-config_slub_cpu_partial.patch
mm-slub-wrap-kmem_cache-cpu_partial-in-config-config_slub_cpu_partial.patch
mm-nobootmem-return-0-when-start_pfn-equals-end_pfn.patch
mm-memory_hotplug-do-not-associate-hotadded-memory-to-zones-until-online-fix.patch
mm-memory_hotplug-do-not-associate-hotadded-memory-to-zones-until-online-fix-2.patch
mm-memory_hotplug-just-build-zonelist-for-new-added-node.patch
mm-page_alloc-return-0-in-case-this-node-has-no-page-within-the-zone.patch
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