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 v2 1/4] mm/memory_hotplug: Spare unnecessary calls to node_set_state
Date: Fri, 21 Sep 2018 15:26:31 +0200 [thread overview]
Message-ID: <20180921132634.10103-2-osalvador@techadventures.net> (raw)
In-Reply-To: <20180921132634.10103-1-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>
Reviewed-by: Pavel Tatashin <pavel.tatashin@microsoft.com>
---
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
next prev parent reply other threads:[~2018-09-21 13:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 13:26 [PATCH v2 0/4] Refactor node_states_check_changes_online/offline Oscar Salvador
2018-09-21 13:26 ` Oscar Salvador [this message]
2018-09-21 13:26 ` [PATCH v2 2/4] mm/memory_hotplug: Tidy up node_states_clear_node Oscar Salvador
2018-09-21 13:26 ` [PATCH v2 3/4] mm/memory_hotplug: Simplify node_states_check_changes_online Oscar Salvador
2018-09-21 14:25 ` Pasha Tatashin
2018-09-21 13:26 ` [PATCH v2 4/4] mm/memory_hotplug: Clean up node_states_check_changes_offline Oscar Salvador
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