Commit bbfceef4 authored by Matt Tolentino's avatar Matt Tolentino Committed by Linus Torvalds
Browse files

[PATCH] add x86-64 specific support for sparsemem 



This patch adds in the necessary support for sparsemem such that x86-64
kernels may use sparsemem as an alternative to discontigmem for NUMA
kernels.  Note that this does no preclude one from continuing to build NUMA
kernels using discontigmem, but merely allows the option to build NUMA
kernels with sparsemem.

Interestingly, the use of sparsemem in lieu of discontigmem in NUMA kernels
results in reduced text size for otherwise equivalent kernels as shown in
the example builds below:

   text	   data	    bss	    dec	    hex	filename
2371036	 765884	1237108	4374028	 42be0c	vmlinux.discontig
2366549	 776484	1302772	4445805	 43d66d	vmlinux.sparse

Signed-off-by: default avatarMatt Tolentino <matthew.e.tolentino@intel.com>
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 2b97690f

arch/x86_64/kernel/setup.c

+17 −10
Original line number Diff line number Diff line
@@ -40,6 +40,8 @@ 
#include <linux/acpi.h>

#include <linux/kallsyms.h>

#include <linux/edd.h>

#include <linux/mmzone.h>



#include <asm/mtrr.h>

#include <asm/uaccess.h>

#include <asm/system.h>
@@ -378,9 +380,12 @@ static __init void parse_cmdline_early (char ** cmdline_p) 
}



#ifndef CONFIG_NUMA

static void __init contig_initmem_init(void)

static void __init

contig_initmem_init(unsigned long start_pfn, unsigned long end_pfn)

{

	unsigned long bootmap_size, bootmap;



	memory_present(0, start_pfn, end_pfn);

	bootmap_size = bootmem_bootmap_pages(end_pfn)<<PAGE_SHIFT;

	bootmap = find_e820_area(0, end_pfn<<PAGE_SHIFT, bootmap_size);

	if (bootmap == -1L)
@@ -557,7 +562,7 @@ void __init setup_arch(char **cmdline_p) 
#ifdef CONFIG_NUMA

	numa_initmem_init(0, end_pfn); 

#else

	contig_initmem_init(); 

	contig_initmem_init(0, end_pfn);

#endif



	/* Reserve direct mapping */
@@ -618,6 +623,8 @@ void __init setup_arch(char **cmdline_p) 
		}

	}

#endif



	sparse_init();

	paging_init();



	check_ioapic();

arch/x86_64/mm/numa.c

+8 −0
Original line number Diff line number Diff line
@@ -66,6 +66,13 @@ int __init compute_hash_shift(struct node *nodes, int numnodes) 
	return -1; 

}



#ifdef CONFIG_SPARSEMEM

int early_pfn_to_nid(unsigned long pfn)

{

	return phys_to_nid(pfn << PAGE_SHIFT);

}

#endif



/* Initialize bootmem allocator for a node */

void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)

{
@@ -80,6 +87,7 @@ void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long en 
	start_pfn = start >> PAGE_SHIFT;

	end_pfn = end >> PAGE_SHIFT;



	memory_present(nodeid, start_pfn, end_pfn);

	nodedata_phys = find_e820_area(start, end, pgdat_size); 

	if (nodedata_phys == -1L) 

		panic("Cannot find memory pgdat in node %d\n", nodeid);

include/asm-x86_64/bitops.h

+0 −2
Original line number Diff line number Diff line
@@ -411,8 +411,6 @@ static __inline__ int ffs(int x) 
/* find last set bit */

#define fls(x) generic_fls(x)



#define ARCH_HAS_ATOMIC_UNSIGNED 1



#endif /* __KERNEL__ */



#endif /* _X86_64_BITOPS_H */

include/asm-x86_64/sparsemem.h

0 → 100644
+26 −0
Original line number Diff line number Diff line 
#ifndef _ASM_X86_64_SPARSEMEM_H

#define _ASM_X86_64_SPARSEMEM_H 1



#ifdef CONFIG_SPARSEMEM



/*

 * generic non-linear memory support:

 *

 * 1) we will not split memory into more chunks than will fit into the flags

 *    field of the struct page

 *

 * SECTION_SIZE_BITS		2^n: size of each section

 * MAX_PHYSADDR_BITS		2^n: max size of physical address space

 * MAX_PHYSMEM_BITS		2^n: how much memory we can have in that space

 *

 */



#define SECTION_SIZE_BITS	27 /* matt - 128 is convenient right now */

#define MAX_PHYSADDR_BITS	40

#define MAX_PHYSMEM_BITS	40



extern int early_pfn_to_nid(unsigned long pfn);



#endif /* CONFIG_SPARSEMEM */



#endif /* _ASM_X86_64_SPARSEMEM_H */

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