[RFC PATCH 2/5] mm/memory_hotplug: Avoid node_set/clear_state(N_HIGH_MEMORY) when !CONFIG_HIGHMEM
From: Oscar Salvador <hidden>
Date: 2018-08-22 09:32:47
Also in:
lkml
Subsystem:
memory hot(un)plug, memory management, the rest · Maintainers:
David Hildenbrand, Oscar Salvador, Andrew Morton, Linus Torvalds
From: Oscar Salvador <osalvador@suse.de> Currently, when !CONFIG_HIGHMEM, status_change_nid_high is being set to status_change_nid_normal, but on such systems, N_HIGH_MEMORY equals N_NORMAL_MEMORY. That means that if status_change_nid_normal is not -1, we will perform two calls to node_set_state for the same memory type. Set status_change_nid_high to -1 for !CONFIG_HIGHMEM, so we skip the double call in node_states_set_node. The same goes for node_clear_state. Signed-off-by: Oscar Salvador <osalvador@suse.de> --- mm/memory_hotplug.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 4a89915e1467..1cfd0b5a9cc7 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c@@ -724,7 +724,11 @@ static void node_states_check_changes_online(unsigned long nr_pages, else arg->status_change_nid_high = -1; #else - arg->status_change_nid_high = arg->status_change_nid_normal; + /* + * When !CONFIG_HIGHMEM, N_HIGH_MEMORY equals N_NORMAL_MEMORY + * so setting the node for N_NORMAL_MEMORY is enough. + */ + arg->status_change_nid_high = -1; #endif /*
@@ -1547,7 +1551,11 @@ static void node_states_check_changes_offline(unsigned long nr_pages, else arg->status_change_nid_high = -1; #else - arg->status_change_nid_high = arg->status_change_nid_normal; + /* + * When !CONFIG_HIGHMEM, N_HIGH_MEMORY equals N_NORMAL_MEMORY + * so clearing the node for N_NORMAL_MEMORY is enough. + */ + arg->status_change_nid_high = -1; #endif /*
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2.13.6