The patch titled
Subject: mm/memory_hotplug.c: spare unnecessary calls to node_set_state
has been added to the -mm tree. Its filename is
mm-memory_hotplug-spare-unnecessary-calls-to-node_set_state.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memory_hotplug-spare-unnecessary-calls-to-node_set_state.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memory_hotplug-spare-unnecessary-calls-to-node_set_state.patch
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------------------------------------------------------
From: Oscar Salvador <osalvador@xxxxxxx>
Subject: mm/memory_hotplug.c: spare unnecessary calls to node_set_state
In node_states_check_changes_online, we check if the node will have to be
set for any of the N_*_MEMORY states after the pages have been onlined.
Later on, we perform the activation in node_states_set_node. Currently,
in node_states_set_node we set the node to N_MEMORY unconditionally.
This means that we call node_set_state for N_MEMORY every time pages go
online, but we only need to do it if the node has not yet been set for
N_MEMORY.
Fix this by checking status_change_nid.
Link: http://lkml.kernel.org/r/20180919100819.25518-2-osalvador@xxxxxxxxxxxxxxxxxx
Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>
Reviewed-by: Pavel Tatashin <pavel.tatashin@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: <yasu.isimatu@xxxxxxxxx>
Cc: Mathieu Malaterre <malat@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory_hotplug.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/memory_hotplug.c~mm-memory_hotplug-spare-unnecessary-calls-to-node_set_state
+++ a/mm/memory_hotplug.c
@@ -753,7 +753,8 @@ static void node_states_set_node(int nod
if (arg->status_change_nid_high >= 0)
node_set_state(node, N_HIGH_MEMORY);
- node_set_state(node, N_MEMORY);
+ if (arg->status_change_nid >= 0)
+ node_set_state(node, N_MEMORY);
}
static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn,
_
Patches currently in -mm which might be from osalvador@xxxxxxx are
mm-page_alloc-clean-up-check_for_memory.patch
mm-memory_hotplug-spare-unnecessary-calls-to-node_set_state.patch
mm-memory_hotplug-tidy-up-node_states_clear_node.patch
mm-memory_hotplug-simplify-node_states_check_changes_online.patch
mm-memory_hotplug-simplify-node_states_check_changes_online-v2.patch
mm-memory_hotplug-clean-up-node_states_check_changes_offline.patch
mm-memory_hotplug-clean-up-node_states_check_changes_offline-v2.patch
