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Memoryless nodes: introduce mask of nodes with memory

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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.

[akpm@linux-foundation.org: build fix]
[Lee.Schermerhorn@hp.com: update N_HIGH_MEMORY node state for memory hotadd]
[y-goto@jp.fujitsu.com: Fix memory hotplug + sparsemem build]
Signed-off-by: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Acked-by: Bob Picco <bob.picco@hp.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@skynet.ie>
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-10-16 01:25:29 -07:00 committed by Linus Torvalds
parent 1380891071
commit 7ea1530ab3
3 changed files with 35 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
include/linux/nodemask.h
View file

@ -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
};

7
mm/memory_hotplug.c
View file

@ -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 */

25
mm/page_alloc.c
View file

@ -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;
}