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authorChristoph Lameter <clameter@sgi.com>2007-10-16 04:25:29 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 12:42:58 -0400
commit7ea1530ab3fdfa85441061909cc8040e84776fd4 (patch)
treef3af0f8ed40a6df90bdbb9396d6163d59798a821 /include/linux/nodemask.h
parent13808910713a98cc1159291e62cdfec92cc94d05 (diff)
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 'include/linux/nodemask.h')
-rw-r--r--include/linux/nodemask.h10
1 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 583e6b843d2a..ccee962f3559 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,
341 * Bitmasks that are kept for all the nodes. 341 * Bitmasks that are kept for all the nodes.
342 */ 342 */
343enum node_states { 343enum node_states {
344 N_POSSIBLE, /* The node could become online at some point */ 344 N_POSSIBLE, /* The node could become online at some point */
345 N_ONLINE, /* The node is online */ 345 N_ONLINE, /* The node is online */
346 N_NORMAL_MEMORY, /* The node has regular memory */
347#ifdef CONFIG_HIGHMEM
348 N_HIGH_MEMORY, /* The node has regular or high memory */
349#else
350 N_HIGH_MEMORY = N_NORMAL_MEMORY,
351#endif
346 NR_NODE_STATES 352 NR_NODE_STATES
347}; 353};
348 354