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hotplug: update nodemasks management 

Update nodemasks management for N_MEMORY.

[lliubbo@gmail.com: fix build]
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Hillf Danton <dhillf@gmail.com>
Cc: Lin Feng <linfeng@cn.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Lai Jiangshan 2012-12-12 13:51:49 -08:00 committed by Linus Torvalds
parent 4b0ef1fe8a
commit 6715ddf945
3 changed files with 77 additions and 16 deletions
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5
Documentation/memory-hotplug.txt
View File

@ -390,6 +390,7 @@ struct memory_notify {
unsigned long start_pfn;
unsigned long nr_pages;
int status_change_nid_normal;
int status_change_nid_high;
int status_change_nid;
}
@ -397,7 +398,9 @@ start_pfn is start_pfn of online/offline memory.
nr_pages is # of pages of online/offline memory.
status_change_nid_normal is set node id when N_NORMAL_MEMORY of nodemask
is (will be) set/clear, if this is -1, then nodemask status is not changed.
status_change_nid is set node id when N_HIGH_MEMORY of nodemask is (will be)
status_change_nid_high is set node id when N_HIGH_MEMORY of nodemask
is (will be) set/clear, if this is -1, then nodemask status is not changed.
status_change_nid is set node id when N_MEMORY of nodemask is (will be)
set/clear. It means a new(memoryless) node gets new memory by online and a
node loses all memory. If this is -1, then nodemask status is not changed.
If status_changed_nid* >= 0, callback should create/discard structures for the

1
include/linux/memory.h
View File

@ -54,6 +54,7 @@ struct memory_notify {
unsigned long start_pfn;
unsigned long nr_pages;
int status_change_nid_normal;
int status_change_nid_high;
int status_change_nid;
};

87
mm/memory_hotplug.c
View File

@ -595,13 +595,15 @@ static void node_states_check_changes_online(unsigned long nr_pages,
enum zone_type zone_last = ZONE_NORMAL;
/*
* If we have HIGHMEM, node_states[N_NORMAL_MEMORY] contains nodes
* which have 0...ZONE_NORMAL, set zone_last to ZONE_NORMAL.
* If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY]
* contains nodes which have zones of 0...ZONE_NORMAL,
* set zone_last to ZONE_NORMAL.
*
* If we don't have HIGHMEM, node_states[N_NORMAL_MEMORY] contains nodes
* which have 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE.
* If we don't have HIGHMEM nor movable node,
* node_states[N_NORMAL_MEMORY] contains nodes which have zones of
* 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE.
*/
if (N_HIGH_MEMORY == N_NORMAL_MEMORY)
if (N_MEMORY == N_NORMAL_MEMORY)
zone_last = ZONE_MOVABLE;
/*
@ -615,12 +617,34 @@ static void node_states_check_changes_online(unsigned long nr_pages,
else
arg->status_change_nid_normal = -1;
#ifdef CONFIG_HIGHMEM
/*
* If we have movable node, node_states[N_HIGH_MEMORY]
* contains nodes which have zones of 0...ZONE_HIGHMEM,
* set zone_last to ZONE_HIGHMEM.
*
* If we don't have movable node, node_states[N_NORMAL_MEMORY]
* contains nodes which have zones of 0...ZONE_MOVABLE,
* set zone_last to ZONE_MOVABLE.
*/
zone_last = ZONE_HIGHMEM;
if (N_MEMORY == N_HIGH_MEMORY)
zone_last = ZONE_MOVABLE;
if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY))
arg->status_change_nid_high = nid;
else
arg->status_change_nid_high = -1;
#else
arg->status_change_nid_high = arg->status_change_nid_normal;
#endif
/*
* if the node don't have memory befor online, we will need to
* set the node to node_states[N_HIGH_MEMORY] after the memory
* set the node to node_states[N_MEMORY] after the memory
* is online.
*/
if (!node_state(nid, N_HIGH_MEMORY))
if (!node_state(nid, N_MEMORY))
arg->status_change_nid = nid;
else
arg->status_change_nid = -1;
@ -631,7 +655,10 @@ static void node_states_set_node(int node, struct memory_notify *arg)
if (arg->status_change_nid_normal >= 0)
node_set_state(node, N_NORMAL_MEMORY);
node_set_state(node, N_HIGH_MEMORY);
if (arg->status_change_nid_high >= 0)
node_set_state(node, N_HIGH_MEMORY);
node_set_state(node, N_MEMORY);
}
@ -1099,13 +1126,15 @@ static void node_states_check_changes_offline(unsigned long nr_pages,
enum zone_type zt, zone_last = ZONE_NORMAL;
/*
* If we have HIGHMEM, node_states[N_NORMAL_MEMORY] contains nodes
* which have 0...ZONE_NORMAL, set zone_last to ZONE_NORMAL.
* If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY]
* contains nodes which have zones of 0...ZONE_NORMAL,
* set zone_last to ZONE_NORMAL.
*
* If we don't have HIGHMEM, node_states[N_NORMAL_MEMORY] contains nodes
* which have 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE.
* If we don't have HIGHMEM nor movable node,
* node_states[N_NORMAL_MEMORY] contains nodes which have zones of
* 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE.
*/
if (N_HIGH_MEMORY == N_NORMAL_MEMORY)
if (N_MEMORY == N_NORMAL_MEMORY)
zone_last = ZONE_MOVABLE;
/*
@ -1122,6 +1151,30 @@ static void node_states_check_changes_offline(unsigned long nr_pages,
else
arg->status_change_nid_normal = -1;
#ifdef CONFIG_HIGHMEM
/*
* If we have movable node, node_states[N_HIGH_MEMORY]
* contains nodes which have zones of 0...ZONE_HIGHMEM,
* set zone_last to ZONE_HIGHMEM.
*
* If we don't have movable node, node_states[N_NORMAL_MEMORY]
* contains nodes which have zones of 0...ZONE_MOVABLE,
* set zone_last to ZONE_MOVABLE.
*/
zone_last = ZONE_HIGHMEM;
if (N_MEMORY == N_HIGH_MEMORY)
zone_last = ZONE_MOVABLE;
for (; zt <= zone_last; zt++)
present_pages += pgdat->node_zones[zt].present_pages;
if (zone_idx(zone) <= zone_last && nr_pages >= present_pages)
arg->status_change_nid_high = zone_to_nid(zone);
else
arg->status_change_nid_high = -1;
#else
arg->status_change_nid_high = arg->status_change_nid_normal;
#endif
/*
* node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE
*/
@ -1146,9 +1199,13 @@ static void node_states_clear_node(int node, struct memory_notify *arg)
if (arg->status_change_nid_normal >= 0)
node_clear_state(node, N_NORMAL_MEMORY);
if ((N_HIGH_MEMORY != N_NORMAL_MEMORY) &&
(arg->status_change_nid >= 0))
if ((N_MEMORY != N_NORMAL_MEMORY) &&
(arg->status_change_nid_high >= 0))
node_clear_state(node, N_HIGH_MEMORY);
if ((N_MEMORY != N_HIGH_MEMORY) &&
(arg->status_change_nid >= 0))
node_clear_state(node, N_MEMORY);
}
static int __ref __offline_pages(unsigned long start_pfn,