Arch-independent zone-sizing determines the size of a node
(pgdat->node_spanned_pages) based on the physical memory that was registered
by the architecture. However, when CONFIG_MEMORY_HOTPLUG_RESERVE is set,
the architecture expects that the spanned_pages will be much larger and that
mem_map will be allocated that is used lated on memory hot-add.
This patch allows an architecture that sets CONFIG_MEMORY_HOTPLUG_RESERVE
to call push_node_boundaries() which will set the node beginning and end to
at *least* the requested boundary.
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc4-mm3-001_account_holes_range/arch/x86_64/mm/srat.c linux-2.6.18-rc4-mm3-002_push_node_boundaries/arch/x86_64/mm/srat.c
--- linux-2.6.18-rc4-mm3-001_account_holes_range/arch/x86_64/mm/srat.c 2006-09-01 13:29:25.000000000 +0100
+++ linux-2.6.18-rc4-mm3-002_push_node_boundaries/arch/x86_64/mm/srat.c 2006-09-01 13:30:57.000000000 +0100
@@ -334,6 +334,8 @@ acpi_numa_memory_affinity_init(struct ac
nd->start, nd->end);
e820_register_active_regions(node, nd->start >> PAGE_SHIFT,
nd->end >> PAGE_SHIFT);
+ push_node_boundaries(node, nd->start >> PAGE_SHIFT,
+ nd->end >> PAGE_SHIFT);
if (ma->flags.hot_pluggable && !reserve_hotadd(node, start, end) < 0) {
/* Ignore hotadd region. Undo damage */
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc4-mm3-001_account_holes_range/include/linux/mm.h linux-2.6.18-rc4-mm3-002_push_node_boundaries/include/linux/mm.h
--- linux-2.6.18-rc4-mm3-001_account_holes_range/include/linux/mm.h 2006-08-28 15:05:30.000000000 +0100
+++ linux-2.6.18-rc4-mm3-002_push_node_boundaries/include/linux/mm.h 2006-09-01 13:30:57.000000000 +0100
@@ -1007,6 +1007,8 @@ extern void add_active_range(unsigned in
unsigned long end_pfn);
extern void shrink_active_range(unsigned int nid, unsigned long old_end_pfn,
unsigned long new_end_pfn);
+extern void push_node_boundaries(unsigned int nid, unsigned long start_pfn,
+ unsigned long end_pfn);
extern void remove_all_active_ranges(void);
extern unsigned long absent_pages_in_range(unsigned long start_pfn,
unsigned long end_pfn);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.18-rc4-mm3-001_account_holes_range/mm/page_alloc.c linux-2.6.18-rc4-mm3-002_push_node_boundaries/mm/page_alloc.c
--- linux-2.6.18-rc4-mm3-001_account_holes_range/mm/page_alloc.c 2006-09-01 13:29:25.000000000 +0100
+++ linux-2.6.18-rc4-mm3-002_push_node_boundaries/mm/page_alloc.c 2006-09-01 13:30:57.000000000 +0100
@@ -131,6 +131,10 @@ static unsigned long __initdata dma_rese
int __initdata nr_nodemap_entries;
unsigned long __initdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
unsigned long __initdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
+#ifdef CONFIG_MEMORY_HOTPLUG_RESERVE
+ unsigned long __initdata node_boundary_start_pfn[MAX_NUMNODES];
+ unsigned long __initdata node_boundary_end_pfn[MAX_NUMNODES];
+#endif /* CONFIG_MEMORY_HOTPLUG_RESERVE */
#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
#ifdef CONFIG_DEBUG_VM
@@ -2186,6 +2190,62 @@ void __init sparse_memory_present_with_a
}
/**
+ * push_node_boundaries - Push node boundaries to at least the requested boundary
+ * @nid: The nid of the node to push the boundary for
+ * @start_pfn: The start pfn of the node
+ * @end_pfn: The end pfn of the node
+ *
+ * In reserve-based hot-add, mem_map is allocated that is unused until hotadd
+ * time. Specifically, on x86_64, SRAT will report ranges that can potentially
+ * be hotplugged even though no physical memory exists. This function allows
+ * an arch to push out the node boundaries so mem_map is allocated that can
+ * be used later.
+ */
+#ifdef CONFIG_MEMORY_HOTPLUG_RESERVE
+void __init push_node_boundaries(unsigned int nid,
+ unsigned long start_pfn, unsigned long end_pfn)
+{
+ printk(KERN_DEBUG "Entering push_node_boundaries(%u, %lu, %lu)\n",
+ nid, start_pfn, end_pfn);
+
+ /* Initialise the boundary for this node if necessary */
+ if (node_boundary_end_pfn[nid] == 0)
+ node_boundary_start_pfn[nid] = -1UL;
+
+ /* Update the boundaries */
+ if (node_boundary_start_pfn[nid] > start_pfn)
+ node_boundary_start_pfn[nid] = start_pfn;
+ if (node_boundary_end_pfn[nid] < end_pfn)
+ node_boundary_end_pfn[nid] = end_pfn;
+}
+
+/* If necessary, push the node boundary out for reserve hotadd */
+static void __init account_node_boundary(unsigned int nid,
+ unsigned long *start_pfn, unsigned long *end_pfn)
+{
+ printk(KERN_DEBUG "Entering account_node_boundary(%u, %lu, %lu)\n",
+ nid, *start_pfn, *end_pfn);
+
+ /* Return if boundary information has not been provided */
+ if (node_boundary_end_pfn[nid] == 0)
+ return;
+
+ /* Check the boundaries and update if necessary */
+ if (node_boundary_start_pfn[nid] < *start_pfn)
+ *start_pfn = node_boundary_start_pfn[nid];
+ if (node_boundary_end_pfn[nid] > *end_pfn)
+ *end_pfn = node_boundary_end_pfn[nid];
+}
+#else
+void __init push_node_boundaries(unsigned int nid,
+ unsigned long start_pfn, unsigned long end_pfn) {}
+
+static void __init account_node_boundary(unsigned int nid,
+ unsigned long *start_pfn, unsigned long *end_pfn) {}
+#endif
+
+
+/**
* get_pfn_range_for_nid - Return the start and end page frames for a node
* @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned
* @start_pfn: Passed by reference. On return, it will have the node start_pfn
@@ -2212,6 +2272,9 @@ void __init get_pfn_range_for_nid(unsign
printk(KERN_WARNING "Node %u active with no memory\n", nid);
*start_pfn = 0;
}
+
+ /* Push the node boundaries out if requested */
+ account_node_boundary(nid, start_pfn, end_pfn);
}
/*
@@ -2655,6 +2718,10 @@ void __init remove_all_active_ranges()
{
memset(early_node_map, 0, sizeof(early_node_map));
nr_nodemap_entries = 0;
+#ifdef CONFIG_MEMORY_HOTPLUG_RESERVE
+ memset(node_boundary_start_pfn, 0, sizeof(node_boundary_start_pfn));
+ memset(node_boundary_end_pfn, 0, sizeof(node_boundary_end_pfn));
+#endif /* CONFIG_MEMORY_HOTPLUG_RESERVE */
}
/* Compare two active node_active_regions */
-
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