numa_internal.h File Reference

#include <linux/types.h>
#include <asm/numa.h>

Go to the source code of this file.

Data Structures
struct	numa_memblk
struct	numa_meminfo

Functions
void __init	numa_remove_memblk_from (int idx, struct numa_meminfo *mi)
int __init	numa_cleanup_meminfo (struct numa_meminfo *mi)
void __init	numa_reset_distance (void)
void __init	x86_numa_init (void)
void __init	init_alloc_remap (int nid, u64 start, u64 end)

Function Documentation

void __init init_alloc_remap	(	int	nid,
		u64	start,
		u64	end
	)

init_alloc_remap - Initialize remap allocator for a NUMA node : NUMA node to initizlie remap allocator for

NUMA nodes may end up without any lowmem. As allocating pgdat and memmap on a different node with lowmem is inefficient, a special remap allocator is implemented which can be used by alloc_remap().

For each node, the amount of memory which will be necessary for pgdat and memmap is calculated and two memory areas of the size are allocated - one in the node and the other in lowmem; then, the area in the node is remapped to the lowmem area.

As pgdat and memmap must be allocated in lowmem anyway, this doesn't waste lowmem address space; however, the actual lowmem which gets remapped over is wasted. The amount shouldn't be problematic on machines this feature will be used.

Initialization failure isn't fatal. alloc_remap() is used opportunistically and the callers will fall back to other memory allocation mechanisms on failure.

Definition at line 180 of file numa_32.c.

int __init numa_cleanup_meminfo

(

struct numa_meminfo *

mi

)

numa_cleanup_meminfo - Cleanup a numa_meminfo : numa_meminfo to clean up

Sanitize by merging and removing unncessary memblks. Also check for conflicts and clear unused memblks.

RETURNS: 0 on success, -errno on failure.

Definition at line 260 of file numa.c.

void __init numa_remove_memblk_from	(	int	idx,
		struct numa_meminfo *	mi
	)

numa_remove_memblk_from - Remove one numa_memblk from a numa_meminfo : Index of memblk to remove : numa_meminfo to remove memblk from

Remove 'th numa_memblk from by shifting ->blk[] and decrementing ->nr_blks.

Definition at line 169 of file numa.c.

void __init numa_reset_distance

(

void

)

numa_reset_distance - Reset NUMA distance table

The current table is freed. The next numa_set_distance() call will create a new one.

Definition at line 361 of file numa.c.

void __init x86_numa_init

(

void

)

x86_numa_init - Initialize NUMA

Try each configured NUMA initialization method until one succeeds. The last fallback is dummy single node config encomapssing whole memory and never fails.

Definition at line 635 of file numa.c.