Commit fb01439c authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds
Browse files

[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: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 9c7cd687

arch/x86_64/mm/srat.c

+2 −0
Original line number Diff line number Diff line
@@ -324,6 +324,8 @@ acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma) 
	       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);



#ifdef RESERVE_HOTADD

 	if (ma->flags.hot_pluggable && reserve_hotadd(node, start, end) < 0) {

include/linux/mm.h

+2 −0
Original line number Diff line number Diff line
@@ -970,6 +970,8 @@ extern void add_active_range(unsigned int nid, unsigned long start_pfn, 
					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);

mm/page_alloc.c

+67 −0
Original line number Diff line number Diff line
@@ -131,6 +131,10 @@ static unsigned long __initdata dma_reserve; 
  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
@@ -2094,6 +2098,62 @@ void __init sparse_memory_present_with_active_regions(int nid) 
				early_node_map[i].end_pfn);

}



/**

 * 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
@@ -2121,6 +2181,9 @@ void __init get_pfn_range_for_nid(unsigned int nid, 
		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);

}



/*
@@ -2527,6 +2590,10 @@ 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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