[PATCH] Allow an arch to expand node boundaries
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. Cc: Dave Hansen <haveblue@us.ibm.com> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Andi Kleen <ak@muc.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: "Keith Mannthey" <kmannth@gmail.com> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Yasunori Goto <y-goto@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -324,6 +324,8 @@ acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
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nd->start, nd->end);
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e820_register_active_regions(node, nd->start >> PAGE_SHIFT,
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nd->end >> PAGE_SHIFT);
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push_node_boundaries(node, nd->start >> PAGE_SHIFT,
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nd->end >> PAGE_SHIFT);
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#ifdef RESERVE_HOTADD
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if (ma->flags.hot_pluggable && reserve_hotadd(node, start, end) < 0) {
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@ -970,6 +970,8 @@ extern void add_active_range(unsigned int nid, unsigned long start_pfn,
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unsigned long end_pfn);
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extern void shrink_active_range(unsigned int nid, unsigned long old_end_pfn,
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unsigned long new_end_pfn);
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extern void push_node_boundaries(unsigned int nid, unsigned long start_pfn,
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unsigned long end_pfn);
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extern void remove_all_active_ranges(void);
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extern unsigned long absent_pages_in_range(unsigned long start_pfn,
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unsigned long end_pfn);
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@ -131,6 +131,10 @@ static unsigned long __initdata dma_reserve;
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int __initdata nr_nodemap_entries;
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unsigned long __initdata arch_zone_lowest_possible_pfn[MAX_NR_ZONES];
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unsigned long __initdata arch_zone_highest_possible_pfn[MAX_NR_ZONES];
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#ifdef CONFIG_MEMORY_HOTPLUG_RESERVE
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unsigned long __initdata node_boundary_start_pfn[MAX_NUMNODES];
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unsigned long __initdata node_boundary_end_pfn[MAX_NUMNODES];
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#endif /* CONFIG_MEMORY_HOTPLUG_RESERVE */
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#endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
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#ifdef CONFIG_DEBUG_VM
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@ -2094,6 +2098,62 @@ void __init sparse_memory_present_with_active_regions(int nid)
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early_node_map[i].end_pfn);
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}
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/**
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* push_node_boundaries - Push node boundaries to at least the requested boundary
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* @nid: The nid of the node to push the boundary for
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* @start_pfn: The start pfn of the node
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* @end_pfn: The end pfn of the node
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*
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* In reserve-based hot-add, mem_map is allocated that is unused until hotadd
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* time. Specifically, on x86_64, SRAT will report ranges that can potentially
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* be hotplugged even though no physical memory exists. This function allows
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* an arch to push out the node boundaries so mem_map is allocated that can
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* be used later.
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*/
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#ifdef CONFIG_MEMORY_HOTPLUG_RESERVE
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void __init push_node_boundaries(unsigned int nid,
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unsigned long start_pfn, unsigned long end_pfn)
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{
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printk(KERN_DEBUG "Entering push_node_boundaries(%u, %lu, %lu)\n",
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nid, start_pfn, end_pfn);
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/* Initialise the boundary for this node if necessary */
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if (node_boundary_end_pfn[nid] == 0)
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node_boundary_start_pfn[nid] = -1UL;
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/* Update the boundaries */
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if (node_boundary_start_pfn[nid] > start_pfn)
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node_boundary_start_pfn[nid] = start_pfn;
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if (node_boundary_end_pfn[nid] < end_pfn)
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node_boundary_end_pfn[nid] = end_pfn;
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}
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/* If necessary, push the node boundary out for reserve hotadd */
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static void __init account_node_boundary(unsigned int nid,
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unsigned long *start_pfn, unsigned long *end_pfn)
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{
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printk(KERN_DEBUG "Entering account_node_boundary(%u, %lu, %lu)\n",
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nid, *start_pfn, *end_pfn);
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/* Return if boundary information has not been provided */
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if (node_boundary_end_pfn[nid] == 0)
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return;
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/* Check the boundaries and update if necessary */
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if (node_boundary_start_pfn[nid] < *start_pfn)
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*start_pfn = node_boundary_start_pfn[nid];
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if (node_boundary_end_pfn[nid] > *end_pfn)
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*end_pfn = node_boundary_end_pfn[nid];
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}
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#else
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void __init push_node_boundaries(unsigned int nid,
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unsigned long start_pfn, unsigned long end_pfn) {}
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static void __init account_node_boundary(unsigned int nid,
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unsigned long *start_pfn, unsigned long *end_pfn) {}
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#endif
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/**
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* get_pfn_range_for_nid - Return the start and end page frames for a node
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* @nid: The nid to return the range for. If MAX_NUMNODES, the min and max PFN are returned
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@ -2121,6 +2181,9 @@ void __init get_pfn_range_for_nid(unsigned int nid,
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printk(KERN_WARNING "Node %u active with no memory\n", nid);
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*start_pfn = 0;
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}
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/* Push the node boundaries out if requested */
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account_node_boundary(nid, start_pfn, end_pfn);
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}
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/*
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@ -2527,6 +2590,10 @@ void __init remove_all_active_ranges()
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{
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memset(early_node_map, 0, sizeof(early_node_map));
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nr_nodemap_entries = 0;
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#ifdef CONFIG_MEMORY_HOTPLUG_RESERVE
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memset(node_boundary_start_pfn, 0, sizeof(node_boundary_start_pfn));
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memset(node_boundary_end_pfn, 0, sizeof(node_boundary_end_pfn));
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#endif /* CONFIG_MEMORY_HOTPLUG_RESERVE */
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}
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/* Compare two active node_active_regions */
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