The patch titled
Add populated_map to account for memoryless nodes
has been added to the -mm tree. Its filename is
add-populated_map-to-account-for-memoryless-nodes.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Add populated_map to account for memoryless nodes
From: Nishanth Aravamudan <nacc@xxxxxxxxxx>
Split up Lee and Anton's original patch
(http://marc.info/?l=linux-mm&m=118133042025995&w=2), to allow for the
populated_map changes to go in on their own.
Add a populated_map nodemask to indicate a node has memory or not. We have
run into a number of issues (in practice and in code) with assumptions
about every node having memory. Having this nodemask allows us to fix
these issues; in particular, THISNODE allocations will come from the node
specified, only, and the INTERLEAVE policy will be able to do the right
thing with memoryless nodes.
Signed-off-by: Nishanth Aravamudan <nacc@xxxxxxxxxx>
Cc: Lee Schermerhorn <lee.schermerhorn@xxxxxx>
Cc: Anton Blanchard <anton@xxxxxxxxx>
Acked-by: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/nodemask.h | 10 ++++++++++
mm/page_alloc.c | 10 ++++++++++
2 files changed, 20 insertions(+)
diff -puN include/linux/nodemask.h~add-populated_map-to-account-for-memoryless-nodes include/linux/nodemask.h
--- a/include/linux/nodemask.h~add-populated_map-to-account-for-memoryless-nodes
+++ a/include/linux/nodemask.h
@@ -64,12 +64,16 @@
*
* int node_online(node) Is some node online?
* int node_possible(node) Is some node possible?
+ * int node_populated(node) Is some node populated?
*
* int any_online_node(mask) First online node in mask
*
* node_set_online(node) set bit 'node' in node_online_map
* node_set_offline(node) clear bit 'node' in node_online_map
*
+ * node_set_populated(node) set bit 'node' in node_populated_map
+ * node_not_populated(node) clear bit 'node' in node_populated_map
+ *
* for_each_node(node) for-loop node over node_possible_map
* for_each_online_node(node) for-loop node over node_online_map
*
@@ -344,12 +348,14 @@ static inline void __nodes_remap(nodemas
extern nodemask_t node_online_map;
extern nodemask_t node_possible_map;
+extern nodemask_t node_populated_map;
#if MAX_NUMNODES > 1
#define num_online_nodes() nodes_weight(node_online_map)
#define num_possible_nodes() nodes_weight(node_possible_map)
#define node_online(node) node_isset((node), node_online_map)
#define node_possible(node) node_isset((node), node_possible_map)
+#define node_populated(node) node_isset((node), node_populated_map)
#define first_online_node first_node(node_online_map)
#define next_online_node(nid) next_node((nid), node_online_map)
extern int nr_node_ids;
@@ -358,6 +364,7 @@ extern int nr_node_ids;
#define num_possible_nodes() 1
#define node_online(node) ((node) == 0)
#define node_possible(node) ((node) == 0)
+#define node_populated(node) ((node) == 0)
#define first_online_node 0
#define next_online_node(nid) (MAX_NUMNODES)
#define nr_node_ids 1
@@ -375,6 +382,9 @@ extern int nr_node_ids;
#define node_set_online(node) set_bit((node), node_online_map.bits)
#define node_set_offline(node) clear_bit((node), node_online_map.bits)
+#define node_set_populated(node) set_bit((node), node_populated_map.bits)
+#define node_not_populated(node) clear_bit((node), node_populated_map.bits)
+
#define for_each_node(node) for_each_node_mask((node), node_possible_map)
#define for_each_online_node(node) for_each_node_mask((node), node_online_map)
diff -puN mm/page_alloc.c~add-populated_map-to-account-for-memoryless-nodes mm/page_alloc.c
--- a/mm/page_alloc.c~add-populated_map-to-account-for-memoryless-nodes
+++ a/mm/page_alloc.c
@@ -54,6 +54,9 @@ nodemask_t node_online_map __read_mostly
EXPORT_SYMBOL(node_online_map);
nodemask_t node_possible_map __read_mostly = NODE_MASK_ALL;
EXPORT_SYMBOL(node_possible_map);
+nodemask_t node_populated_map __read_mostly = NODE_MASK_NONE;
+EXPORT_SYMBOL(node_populated_map);
+
unsigned long totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
long nr_swap_pages;
@@ -1967,6 +1970,13 @@ static void build_zonelists(pg_data_t *p
/* calculate node order -- i.e., DMA last! */
build_zonelists_in_zone_order(pgdat, j);
}
+
+ /*
+ * record populated zones for use when INTERLEAVE'ing or using
+ * GFP_THISNODE
+ */
+ if (pgdat->node_present_pages)
+ node_set_populated(local_node);
}
/* Construct the zonelist performance cache - see further mmzone.h */
_
Patches currently in -mm which might be from nacc@xxxxxxxxxx are
hugetlb-remove-unnecessary-nid-initialization.patch
gfph-gfp_thisnode-can-go-to-other-nodes-if-some-are-unpopulated.patch
add-populated_map-to-account-for-memoryless-nodes.patch
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