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authorChristoph Lameter <clameter@sgi.com>2007-10-16 01:25:29 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:58 -0700
commit7ea1530ab3fdfa85441061909cc8040e84776fd4 (patch)
treef3af0f8ed40a6df90bdbb9396d6163d59798a821 /mm/memory_hotplug.c
parent13808910713a98cc1159291e62cdfec92cc94d05 (diff)
downloadlwn-7ea1530ab3fdfa85441061909cc8040e84776fd4.tar.gz
lwn-7ea1530ab3fdfa85441061909cc8040e84776fd4.zip
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. [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>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index df9d554bea30..9c12ae5e3695 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 */