Commit 076422d2 authored by Amul Shah's avatar Amul Shah Committed by Andi Kleen
Browse files

[PATCH] x86-64: Allocate the NUMA hash function nodemap dynamically 



Remove the statically allocated memory to NUMA node hash map in favor of a
dynamically allocated memory to node hash map (it is cache aligned).

This patch has the nice side effect in that it allows the hash map to grow
for systems with large amounts of memory (256GB - 1TB), but suffer from
having small PCI space tacked onto the boot node (which is somewhere
between 192MB to 512MB on the ES7000).

Signed-off-by: default avatarAmul Shah <amul.shah@unisys.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Rohit Seth <rohitseth@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
parent 0812a579

arch/x86_64/kernel/e820.c

+7 −0
Original line number Diff line number Diff line
@@ -83,6 +83,13 @@ static inline int bad_addr(unsigned long *addrp, unsigned long size) 
		return 1;

	}



#ifdef CONFIG_NUMA

	/* NUMA memory to node map */

	if (last >= nodemap_addr && addr < nodemap_addr + nodemap_size) {

		*addrp = nodemap_addr + nodemap_size;

		return 1;

	}

#endif

	/* XXX ramdisk image here? */ 

	return 0;

}

arch/x86_64/kernel/setup.c

+5 −0
Original line number Diff line number Diff line
@@ -444,6 +444,11 @@ void __init setup_arch(char **cmdline_p) 
	/* reserve ebda region */

	if (ebda_addr)

		reserve_bootmem_generic(ebda_addr, ebda_size);

#ifdef CONFIG_NUMA

	/* reserve nodemap region */

	if (nodemap_addr)

		reserve_bootmem_generic(nodemap_addr, nodemap_size);

#endif



#ifdef CONFIG_SMP

	/*

arch/x86_64/mm/numa.c

+65 −9
Original line number Diff line number Diff line
@@ -36,6 +36,8 @@ unsigned char apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = { 
cpumask_t node_to_cpumask[MAX_NUMNODES] __read_mostly;



int numa_off __initdata;

unsigned long __initdata nodemap_addr;

unsigned long __initdata nodemap_size;





/*
@@ -52,15 +54,13 @@ populate_memnodemap(const struct bootnode *nodes, int numnodes, int shift) 
	int res = -1;

	unsigned long addr, end;



	if (shift >= 64)

		return -1;

	memset(memnodemap, 0xff, sizeof(memnodemap));

	memset(memnodemap, 0xff, memnodemapsize);

	for (i = 0; i < numnodes; i++) {

		addr = nodes[i].start;

		end = nodes[i].end;

		if (addr >= end)

			continue;

		if ((end >> shift) >= NODEMAPSIZE)

		if ((end >> shift) >= memnodemapsize)

			return 0;

		do {

			if (memnodemap[addr >> shift] != 0xff)
@@ -73,13 +73,68 @@ populate_memnodemap(const struct bootnode *nodes, int numnodes, int shift) 
	return res;

}



int __init compute_hash_shift(struct bootnode *nodes, int numnodes)

static int __init allocate_cachealigned_memnodemap(void)

{

	unsigned long pad, pad_addr;



	memnodemap = memnode.embedded_map;

	if (memnodemapsize <= 48) {

		printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n",

		       nodemap_addr, nodemap_addr + nodemap_size);

		return 0;

	}



	pad = L1_CACHE_BYTES - 1;

	pad_addr = 0x8000;

	nodemap_size = pad + memnodemapsize;

	nodemap_addr = find_e820_area(pad_addr, end_pfn<<PAGE_SHIFT,

				      nodemap_size);

	if (nodemap_addr == -1UL) {

		printk(KERN_ERR

		       "NUMA: Unable to allocate Memory to Node hash map\n");

		nodemap_addr = nodemap_size = 0;

		return -1;

	}

	pad_addr = (nodemap_addr + pad) & ~pad;

	memnodemap = phys_to_virt(pad_addr);



	printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n",

	       nodemap_addr, nodemap_addr + nodemap_size);

	return 0;

}



/*

 * The LSB of all start and end addresses in the node map is the value of the

 * maximum possible shift.

 */

static int __init

extract_lsb_from_nodes (const struct bootnode *nodes, int numnodes)

{

	int shift = 20;

	int i;

	unsigned long start, end;

	unsigned long bitfield = 0, memtop = 0;



	while (populate_memnodemap(nodes, numnodes, shift + 1) >= 0)

		shift++;

	for (i = 0; i < numnodes; i++) {

		start = nodes[i].start;

		end = nodes[i].end;

		if (start >= end)

			continue;

		bitfield |= start | end;

		if (end > memtop)

			memtop = end;

	}

	i = find_first_bit(&bitfield, sizeof(unsigned long)*8);

	memnodemapsize = (memtop >> i)+1;

	return i;

}



int __init compute_hash_shift(struct bootnode *nodes, int numnodes)

{

	int shift;



	shift = extract_lsb_from_nodes(nodes, numnodes);

	if (allocate_cachealigned_memnodemap())

		return -1;

	printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n",

		shift);
@@ -290,6 +345,7 @@ void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn) 
	       end_pfn << PAGE_SHIFT); 

		/* setup dummy node covering all memory */ 

	memnode_shift = 63; 

	memnodemap = memnode.embedded_map;

	memnodemap[0] = 0;

	nodes_clear(node_online_map);

	node_set_online(0);

include/asm-x86_64/e820.h

+1 −0
Original line number Diff line number Diff line
@@ -56,6 +56,7 @@ extern void finish_e820_parsing(void); 
extern struct e820map e820;



extern unsigned ebda_addr, ebda_size;

extern unsigned long nodemap_addr, nodemap_size;

#endif/*!__ASSEMBLY__*/



#endif/*__E820_HEADER*/

include/asm-x86_64/mmzone.h

+7 −6
Original line number Diff line number Diff line
@@ -11,24 +11,25 @@ 


#include <asm/smp.h>



/* Should really switch to dynamic allocation at some point */

#define NODEMAPSIZE 0x4fff



/* Simple perfect hash to map physical addresses to node numbers */

struct memnode {

	int shift;

	u8 map[NODEMAPSIZE];

} ____cacheline_aligned;

	unsigned int mapsize;

	u8 *map;

	u8 embedded_map[64-16];

} ____cacheline_aligned; /* total size = 64 bytes */

extern struct memnode memnode;

#define memnode_shift memnode.shift

#define memnodemap memnode.map

#define memnodemapsize memnode.mapsize



extern struct pglist_data *node_data[];



static inline __attribute__((pure)) int phys_to_nid(unsigned long addr) 

{ 

	unsigned nid; 

	VIRTUAL_BUG_ON((addr >> memnode_shift) >= NODEMAPSIZE);

	VIRTUAL_BUG_ON(!memnodemap);

	VIRTUAL_BUG_ON((addr >> memnode_shift) >= memnodemapsize);

	nid = memnodemap[addr >> memnode_shift]; 

	VIRTUAL_BUG_ON(nid >= MAX_NUMNODES || !node_data[nid]); 

	return nid;

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