[patch] memblk_online_map 2.5.45 (4/5)

[Matthew Dobson <colpatch@us.ibm.com>]

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Matthew Dobson wrote:
> Matthew Dobson wrote:
> 
>>
>> Linus,
>>     This series of patches creates a directory-based Topology in sysfs 
>> (driverfs).  This includes the per-node meminfo patch you wanted, as 
>> well as UP/SMP/NUMA topology.
>>     There were discussions between myself, Andrew, Rusty, and Patrick, 
>> and these are what we agreed on.
>>
>> (1/5) Core sysfs Topology:
>>     This patch creates the generic structures that are (will be)
>>     embedded in the per-arch structures.  Also creates calls to
>>     register these generic structures (CPUs, MemBlks, & Nodes).
>>
>>     Note that without arch-specific structures in which to embed
>>     these structures, and an arch-specific initialization routine,
>>     these functions/structures remain unused.
>>
>> (2/5) i386 sysfs Topology
>>     This patch creates the i386 specific files/functions/structures
>>     to implement driverfs Topology.  These structures have the
>>     generic CPU/MemBlk/Node structures embedded in them.
>>
>>     This patch also creates the arch-specific initialization routine
>>     to instantiate the topology.
>>
>> (3/5) per-node (NUMA) meminfo for sysfs Topology
>>     This patch adds code to DriverFS Topology to expose per-node
>>     memory statistics.
>>     This information is exposed via the nodeX/meminfo file.
>>
>>     The patch also adds 2 helper functions to gather per-node memory
>>     info.
>>
>> (4/5) memblk_online_map
>>     This patch creates a memblk_online_map, much like
>>     cpu_online_map.  It also creates the standard helper functions,
>>     ie: memblk_online(), num_online_memblks(), memblk_set_online(),
>>     memblk_set_offline().
>>
>>     This is used by driverFS topology to keep track of which memory
>>     blocks are in the system and online.
>>
>> (5/5) node_online_map
>>     This patch creates a node_online_map, much like cpu_online_map.
>>     It also creates the standard helper functions, ie:
>>     node_online(), num_online_nodes(), node_set_online(),
>>     node_set_offline().
>>
>>     This is used by driverFS topology to keep track of which Nodes
>>     are in the system and online.
>>
>> Cheers!
>>
>> -Matt

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diff -Nur --exclude-from=/usr/src/.dontdiff linux-2.5.45-base/arch/i386/mach-generic/topology.c linux-2.5.45-memblk_online_map/arch/i386/mach-generic/topology.c
--- linux-2.5.45-base/arch/i386/mach-generic/topology.c	Wed Oct 30 17:54:32 2002
+++ linux-2.5.45-memblk_online_map/arch/i386/mach-generic/topology.c	Wed Oct 30 18:02:17 2002
@@ -48,7 +48,7 @@
 		arch_register_node(i);
 	for (i = 0; i < NR_CPUS; i++)
 		if (cpu_possible(i)) arch_register_cpu(i);
-	for (i = 0; i < numnodes; i++)
+	for (i = 0; i < num_online_memblks(); i++)
 		arch_register_memblk(i);
 	return 0;
 }
diff -Nur --exclude-from=/usr/src/.dontdiff linux-2.5.45-base/include/linux/mmzone.h linux-2.5.45-memblk_online_map/include/linux/mmzone.h
--- linux-2.5.45-base/include/linux/mmzone.h	Wed Oct 30 16:41:34 2002
+++ linux-2.5.45-memblk_online_map/include/linux/mmzone.h	Wed Oct 30 18:02:17 2002
@@ -279,6 +279,38 @@
 
 #endif /* !CONFIG_DISCONTIGMEM */
 
+
+extern DECLARE_BITMAP(memblk_online_map, MAX_NR_MEMBLKS);
+
+#if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_NUMA)
+
+#define memblk_online(memblk)		test_bit(memblk, memblk_online_map)
+#define memblk_set_online(memblk)	set_bit(memblk, memblk_online_map)
+#define memblk_set_offline(memblk)	clear_bit(memblk, memblk_online_map)
+static inline unsigned int num_online_memblks(void)
+{
+	int i, num = 0;
+
+	for(i = 0; i < MAX_NR_MEMBLKS; i++){
+		if (memblk_online(i))
+			num++;
+	}
+	return num;
+}
+
+#else /* !CONFIG_DISCONTIGMEM && !CONFIG_NUMA */
+
+#define memblk_online(memblk) \
+	({ BUG_ON((memblk) != 0); test_bit(memblk, memblk_online_map); })
+#define memblk_set_online(memblk) \
+	({ BUG_ON((memblk) != 0); set_bit(memblk, memblk_online_map); })
+#define memblk_set_offline(memblk) \
+	({ BUG_ON((memblk) != 0); clear_bit(memblk, memblk_online_map); })
+#define num_online_memblks()		1
+
+#endif /* CONFIG_DISCONTIGMEM || CONFIG_NUMA */
+
+
 #define MAP_ALIGN(x)	((((x) % sizeof(struct page)) == 0) ? (x) : ((x) + \
 		sizeof(struct page) - ((x) % sizeof(struct page))))
 
diff -Nur --exclude-from=/usr/src/.dontdiff linux-2.5.45-base/mm/page_alloc.c linux-2.5.45-memblk_online_map/mm/page_alloc.c
--- linux-2.5.45-base/mm/page_alloc.c	Wed Oct 30 17:56:28 2002
+++ linux-2.5.45-memblk_online_map/mm/page_alloc.c	Wed Oct 30 18:02:17 2002
@@ -29,6 +29,9 @@
 #include <linux/slab.h>
 #include <linux/notifier.h>
 
+#include <asm/topology.h>
+
+DECLARE_BITMAP(memblk_online_map, MAX_NR_MEMBLKS);
 struct pglist_data *pgdat_list;
 unsigned long totalram_pages;
 unsigned long totalhigh_pages;
@@ -1163,6 +1166,7 @@
 	pgdat->node_mem_map = node_mem_map;
 
 	free_area_init_core(pgdat, zones_size, zholes_size);
+	memblk_set_online(__node_to_memblk(nid));
 
 	calculate_zone_bitmap(pgdat, zones_size);
 }