Commit 6f167ec7 authored by Dave Hansen's avatar Dave Hansen Committed by Linus Torvalds
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[PATCH] sparsemem base: simple NUMA remap space allocator 



Introduce a simple allocator for the NUMA remap space.  This space is very
scarce, used for structures which are best allocated node local.

This mechanism is also used on non-NUMA ia64 systems with a vmem_map to keep
the pgdat->node_mem_map initialized in a consistent place for all
architectures.

Issues:
o alloc_remap takes a node_id where we might expect a pgdat which was intended
  to allow us to allocate the pgdat's using this mechanism; which we do not yet
  do.  Could have alloc_remap_node() and alloc_remap_nid() for this purpose.

Signed-off-by: default avatarAndy Whitcroft <apw@shadowen.org>
Signed-off-by: default avatarDave Hansen <haveblue@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c2ebaa42

arch/i386/Kconfig

+5 −0
Original line number Diff line number Diff line
@@ -803,6 +803,11 @@ config NEED_NODE_MEMMAP_SIZE 
	depends on DISCONTIGMEM

	default y



config HAVE_ARCH_ALLOC_REMAP

	bool

	depends on NUMA

	default y



config HIGHPTE

	bool "Allocate 3rd-level pagetables from highmem"

	depends on HIGHMEM4G || HIGHMEM64G

arch/i386/mm/discontig.c

+31 −28
Original line number Diff line number Diff line
@@ -108,6 +108,9 @@ unsigned long node_remap_offset[MAX_NUMNODES]; 
void *node_remap_start_vaddr[MAX_NUMNODES];

void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);



void *node_remap_end_vaddr[MAX_NUMNODES];

void *node_remap_alloc_vaddr[MAX_NUMNODES];



/*

 * FLAT - support for basic PC memory model with discontig enabled, essentially

 *        a single node with all available processors in it with a flat
@@ -178,6 +181,21 @@ static void __init allocate_pgdat(int nid) 
	}

}



void *alloc_remap(int nid, unsigned long size)

{

	void *allocation = node_remap_alloc_vaddr[nid];



	size = ALIGN(size, L1_CACHE_BYTES);



	if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid])

		return 0;



	node_remap_alloc_vaddr[nid] += size;

	memset(allocation, 0, size);



	return allocation;

}



void __init remap_numa_kva(void)

{

	void *vaddr;
@@ -185,8 +203,6 @@ void __init remap_numa_kva(void) 
	int node;



	for_each_online_node(node) {

		if (node == 0)

			continue;

		for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) {

			vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT);

			set_pmd_pfn((ulong) vaddr,
@@ -202,11 +218,6 @@ static unsigned long calculate_numa_remap_pages(void) 
	unsigned long size, reserve_pages = 0;



	for_each_online_node(nid) {

		if (nid == 0)

			continue;

		if (!node_remap_size[nid])

			continue;



		/*

		 * The acpi/srat node info can show hot-add memroy zones

		 * where memory could be added but not currently present.
@@ -226,8 +237,8 @@ static unsigned long calculate_numa_remap_pages(void) 
		printk("Reserving %ld pages of KVA for lmem_map of node %d\n",

				size, nid);

		node_remap_size[nid] = size;

		reserve_pages += size;

		node_remap_offset[nid] = reserve_pages;

		reserve_pages += size;

		printk("Shrinking node %d from %ld pages to %ld pages\n",

			nid, node_end_pfn[nid], node_end_pfn[nid] - size);

		node_end_pfn[nid] -= size;
@@ -280,12 +291,18 @@ unsigned long __init setup_memory(void) 
			(ulong) pfn_to_kaddr(max_low_pfn));

	for_each_online_node(nid) {

		node_remap_start_vaddr[nid] = pfn_to_kaddr(

			(highstart_pfn + reserve_pages) - node_remap_offset[nid]);

				highstart_pfn + node_remap_offset[nid]);

		/* Init the node remap allocator */

		node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +

			(node_remap_size[nid] * PAGE_SIZE);

		node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +

			ALIGN(sizeof(pg_data_t), PAGE_SIZE);



		allocate_pgdat(nid);

		printk ("node %d will remap to vaddr %08lx - %08lx\n", nid,

			(ulong) node_remap_start_vaddr[nid],

			(ulong) pfn_to_kaddr(highstart_pfn + reserve_pages

			    - node_remap_offset[nid] + node_remap_size[nid]));

			(ulong) pfn_to_kaddr(highstart_pfn

			   + node_remap_offset[nid] + node_remap_size[nid]));

	}

	printk("High memory starts at vaddr %08lx\n",

			(ulong) pfn_to_kaddr(highstart_pfn));
@@ -348,23 +365,9 @@ void __init zone_sizes_init(void) 
		}



		zholes_size = get_zholes_size(nid);

		/*

		 * We let the lmem_map for node 0 be allocated from the

		 * normal bootmem allocator, but other nodes come from the

		 * remapped KVA area - mbligh

		 */

		if (!nid)

			free_area_init_node(nid, NODE_DATA(nid),

					zones_size, start, zholes_size);

		else {

			unsigned long lmem_map;

			lmem_map = (unsigned long)node_remap_start_vaddr[nid];

			lmem_map += sizeof(pg_data_t) + PAGE_SIZE - 1;

			lmem_map &= PAGE_MASK;

			NODE_DATA(nid)->node_mem_map = (struct page *)lmem_map;

			free_area_init_node(nid, NODE_DATA(nid), zones_size,

				start, zholes_size);

		}



		free_area_init_node(nid, NODE_DATA(nid), zones_size, start,

				zholes_size);

	}

	return;

}

include/linux/bootmem.h

+9 −0
Original line number Diff line number Diff line
@@ -67,6 +67,15 @@ extern void * __init __alloc_bootmem_node (pg_data_t *pgdat, unsigned long size, 
	__alloc_bootmem_node((pgdat), (x), PAGE_SIZE, 0)

#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */



#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP

extern void *alloc_remap(int nid, unsigned long size);

#else

static inline void *alloc_remap(int nid, unsigned long size)

{

	return NULL;

}

#endif



extern unsigned long __initdata nr_kernel_pages;

extern unsigned long __initdata nr_all_pages;

mm/page_alloc.c

+5 −1
Original line number Diff line number Diff line
@@ -1936,6 +1936,7 @@ static void __init free_area_init_core(struct pglist_data *pgdat, 
static void __init alloc_node_mem_map(struct pglist_data *pgdat)

{

	unsigned long size;

	struct page *map;



	/* Skip empty nodes */

	if (!pgdat->node_spanned_pages)
@@ -1944,7 +1945,10 @@ static void __init alloc_node_mem_map(struct pglist_data *pgdat) 
	/* ia64 gets its own node_mem_map, before this, without bootmem */

	if (!pgdat->node_mem_map) {

		size = (pgdat->node_spanned_pages + 1) * sizeof(struct page);

		pgdat->node_mem_map = alloc_bootmem_node(pgdat, size);

		map = alloc_remap(pgdat->node_id, size);

		if (!map)

			map = alloc_bootmem_node(pgdat, size);

		pgdat->node_mem_map = map;

	}

#ifndef CONFIG_DISCONTIGMEM

	/*

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