lkml.org 
[lkml]   [2018]   [Aug]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH 2/5] mm/memory_hotplug: Avoid node_set/clear_state(N_HIGH_MEMORY) when !CONFIG_HIGHMEM
Date
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

/*
--
2.13.6
\
 
 \ /
  Last update: 2018-08-22 11:33    [W:0.041 / U:0.192 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site