Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7ea1530ab3fdfa85441061909cc8040e84776fd4
Commit: 7ea1530ab3fdfa85441061909cc8040e84776fd4
Parent: 13808910713a98cc1159291e62cdfec92cc94d05
Author: Christoph Lameter <[EMAIL PROTECTED]>
AuthorDate: Tue Oct 16 01:25:29 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Oct 16 09:42:58 2007 -0700
Memoryless nodes: introduce mask of nodes with memory
It is necessary to know if nodes have memory since we have recently begun to
add support for memoryless nodes. For that purpose we introduce a two new
node states: N_HIGH_MEMORY and N_NORMAL_MEMORY.
A node has its bit in N_HIGH_MEMORY set if it has any memory regardless of
the
type of mmemory. If a node has memory then it has at least one zone defined
in its pgdat structure that is located in the pgdat itself.
A node has its bit in N_NORMAL_MEMORY set if it has a lower zone than
ZONE_HIGHMEM. This means it is possible to allocate memory that is not
subject to kmap.
N_HIGH_MEMORY and N_NORMAL_MEMORY can then be used in various places to
insure
that we do the right thing when we encounter a memoryless node.
[EMAIL PROTECTED]: build fix]
[EMAIL PROTECTED]: update N_HIGH_MEMORY node state for memory hotadd]
[EMAIL PROTECTED]: Fix memory hotplug + sparsemem build]
Signed-off-by: Lee Schermerhorn <[EMAIL PROTECTED]>
Signed-off-by: Nishanth Aravamudan <[EMAIL PROTECTED]>
Signed-off-by: Christoph Lameter <[EMAIL PROTECTED]>
Acked-by: Bob Picco <[EMAIL PROTECTED]>
Cc: KAMEZAWA Hiroyuki <[EMAIL PROTECTED]>
Cc: Mel Gorman <[EMAIL PROTECTED]>
Signed-off-by: Yasunori Goto <[EMAIL PROTECTED]>
Signed-off-by: Paul Mundt <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
include/linux/nodemask.h | 10 ++++++++--
mm/memory_hotplug.c | 7 ++++---
mm/page_alloc.c | 25 +++++++++++++++++++++++--
3 files changed, 35 insertions(+), 7 deletions(-)
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 583e6b8..ccee962 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -341,8 +341,14 @@ static inline void __nodes_remap(nodemask_t *dstp, const
nodemask_t *srcp,
* Bitmasks that are kept for all the nodes.
*/
enum node_states {
- N_POSSIBLE, /* The node could become online at some point */
- N_ONLINE, /* The node is online */
+ N_POSSIBLE, /* The node could become online at some point */
+ N_ONLINE, /* The node is online */
+ N_NORMAL_MEMORY, /* The node has regular memory */
+#ifdef CONFIG_HIGHMEM
+ N_HIGH_MEMORY, /* The node has regular or high memory */
+#else
+ N_HIGH_MEMORY = N_NORMAL_MEMORY,
+#endif
NR_NODE_STATES
};
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index df9d554..9c12ae5 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -217,6 +217,10 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
zone->zone_pgdat->node_present_pages += onlined_pages;
setup_per_zone_pages_min();
+ if (onlined_pages) {
+ kswapd_run(zone_to_nid(zone));
+ node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
+ }
if (need_zonelists_rebuild)
build_all_zonelists();
@@ -271,9 +275,6 @@ int add_memory(int nid, u64 start, u64 size)
if (!pgdat)
return -ENOMEM;
new_pgdat = 1;
- ret = kswapd_run(nid);
- if (ret)
- goto error;
}
/* call arch's memory hotadd */
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0cc5b3e..07dfd89 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2080,14 +2080,35 @@ static void build_zonelist_cache(pg_data_t *pgdat)
#endif /* CONFIG_NUMA */
+/* Any regular memory on that node ? */
+static void check_for_regular_memory(pg_data_t *pgdat)
+{
+#ifdef CONFIG_HIGHMEM
+ enum zone_type zone_type;
+
+ for (zone_type = 0; zone_type <= ZONE_NORMAL; zone_type++) {
+ struct zone *zone = &pgdat->node_zones[zone_type];
+ if (zone->present_pages)
+ node_set_state(zone_to_nid(zone), N_NORMAL_MEMORY);
+ }
+#endif
+}
+
/* return values int ....just for stop_machine_run() */
static int __build_all_zonelists(void *dummy)
{
int nid;
for_each_online_node(nid) {
- build_zonelists(NODE_DATA(nid));
- build_zonelist_cache(NODE_DATA(nid));
+ pg_data_t *pgdat = NODE_DATA(nid);
+
+ build_zonelists(pgdat);
+ build_zonelist_cache(pgdat);
+
+ /* Any memory on that node */
+ if (pgdat->node_present_pages)
+ node_set_state(nid, N_HIGH_MEMORY);
+ check_for_regular_memory(pgdat);
}
return 0;
}
-
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