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 <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
---
memhotplug-dave/arch/i386/Kconfig | 5 ++
memhotplug-dave/arch/i386/mm/discontig.c | 59 ++++++++++++++++---------------
memhotplug-dave/include/linux/bootmem.h | 9 ++++
memhotplug-dave/mm/page_alloc.c | 6 ++-
4 files changed, 50 insertions(+), 29 deletions(-)
diff -puN arch/i386/Kconfig~FROM-MM-alloc_remap-i386 arch/i386/Kconfig
--- memhotplug/arch/i386/Kconfig~FROM-MM-alloc_remap-i386 2005-03-25 08:17:11.000000000 -0800
+++ memhotplug-dave/arch/i386/Kconfig 2005-03-25 08:17:11.000000000 -0800
@@ -787,6 +787,11 @@ 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 -puN arch/i386/mm/discontig.c~FROM-MM-alloc_remap-i386 arch/i386/mm/discontig.c
--- memhotplug/arch/i386/mm/discontig.c~FROM-MM-alloc_remap-i386 2005-03-25 08:17:11.000000000 -0800
+++ memhotplug-dave/arch/i386/mm/discontig.c 2005-03-25 08:17:11.000000000 -0800
@@ -108,6 +108,9 @@ unsigned long node_remap_offset[MAX_NUMN
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
@@ -163,6 +166,21 @@ static void __init allocate_pgdat(int ni
}
}
+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;
@@ -170,8 +188,6 @@ 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,
@@ -188,11 +204,6 @@ static unsigned long calculate_numa_rema
unsigned long pfn;
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.
@@ -225,8 +236,8 @@ static unsigned long calculate_numa_rema
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;
@@ -279,12 +290,18 @@ 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));
@@ -347,23 +364,9 @@ 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;
}
diff -puN include/linux/bootmem.h~FROM-MM-alloc_remap-i386 include/linux/bootmem.h
--- memhotplug/include/linux/bootmem.h~FROM-MM-alloc_remap-i386 2005-03-25 08:17:11.000000000 -0800
+++ memhotplug-dave/include/linux/bootmem.h 2005-03-25 08:17:11.000000000 -0800
@@ -67,6 +67,15 @@ extern void * __init __alloc_bootmem_nod
__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;
diff -puN mm/page_alloc.c~FROM-MM-alloc_remap-i386 mm/page_alloc.c
--- memhotplug/mm/page_alloc.c~FROM-MM-alloc_remap-i386 2005-03-25 08:17:11.000000000 -0800
+++ memhotplug-dave/mm/page_alloc.c 2005-03-25 08:17:11.000000000 -0800
@@ -1729,6 +1729,7 @@ static void __init free_area_init_core(s
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)
@@ -1737,7 +1738,10 @@ static void __init alloc_node_mem_map(st
/* 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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