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authorDave Hansen <haveblue@us.ibm.com>2005-06-23 00:07:39 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-23 09:45:01 -0700
commit6f167ec721108c9282d54424516a12c805e3c306 (patch)
treef7094a2524611ede76b32e4cc3c07987b7b0e275 /arch
parentc2ebaa425e6630adcbf757b004d257dd4204925b (diff)
downloadop-kernel-dev-6f167ec721108c9282d54424516a12c805e3c306.zip
op-kernel-dev-6f167ec721108c9282d54424516a12c805e3c306.tar.gz
[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: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/i386/Kconfig5
-rw-r--r--arch/i386/mm/discontig.c59
2 files changed, 36 insertions, 28 deletions
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index dfd904f..35ca3a1 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -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
diff --git a/arch/i386/mm/discontig.c b/arch/i386/mm/discontig.c
index 85d2fcb..dcc71f96 100644
--- a/arch/i386/mm/discontig.c
+++ b/arch/i386/mm/discontig.c
@@ -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;
}
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