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From: Oscar Salvador <osalvador@techadventures.net>
To: akpm@linux-foundation.org
Cc: mhocko@suse.com, dan.j.williams@intel.com, david@redhat.com,
	Pavel.Tatashin@microsoft.com, Jonathan.Cameron@huawei.com,
	yasu.isimatu@gmail.com, malat@debian.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, Oscar Salvador <osalvador@suse.de>
Subject: [PATCH 1/5] mm/memory_hotplug: Spare unnecessary calls to node_set_state
Date: Wed, 19 Sep 2018 12:08:15 +0200	[thread overview]
Message-ID: <20180919100819.25518-2-osalvador@techadventures.net> (raw)
In-Reply-To: <20180919100819.25518-1-osalvador@techadventures.net>

From: Oscar Salvador <osalvador@suse.de>

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.

Signed-off-by: Oscar Salvador <osalvador@suse.de>
---
 mm/memory_hotplug.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 38d94b703e9d..63facfc57224 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -753,7 +753,8 @@ static void node_states_set_node(int node, struct memory_notify *arg)
 	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,
-- 
2.13.6


  reply	other threads:[~2018-09-19 10:09 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-19 10:08 [PATCH 0/5] Refactor node_states_check_changes_online/offline Oscar Salvador
2018-09-19 10:08 ` Oscar Salvador [this message]
2018-09-20 20:53   ` [PATCH 1/5] mm/memory_hotplug: Spare unnecessary calls to node_set_state Pasha Tatashin
2018-09-19 10:08 ` [PATCH 2/5] mm/memory_hotplug: Avoid node_set/clear_state(N_HIGH_MEMORY) when !CONFIG_HIGHMEM Oscar Salvador
2018-09-20 20:59   ` Pasha Tatashin
2018-09-21 10:31     ` Oscar Salvador
2018-09-19 10:08 ` [PATCH 3/5] mm/memory_hotplug: Tidy up node_states_clear_node Oscar Salvador
2018-09-20 23:40   ` Pasha Tatashin
2018-09-19 10:08 ` [PATCH 4/5] mm/memory_hotplug: Simplify node_states_check_changes_online Oscar Salvador
2018-09-21  0:15   ` Pasha Tatashin
2018-09-21 10:30     ` Oscar Salvador
2018-09-19 10:08 ` [PATCH 5/5] mm/memory_hotplug: Clean up node_states_check_changes_offline Oscar Salvador
2018-09-21  0:38   ` Pasha Tatashin

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