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Subject[PATCH 4/6] Have x86_64 use add_active_range() and free_area_init_nodes
Date

Size zones and holes in an architecture independent manner for x86_64.

This has only been boot tested on an x86_64 with NUMA and SRAT.


arch/x86_64/Kconfig | 3 ++
arch/x86_64/kernel/e820.c | 18 ++++++++++++
arch/x86_64/mm/init.c | 60 +---------------------------------------
arch/x86_64/mm/numa.c | 15 +++++-----
include/asm-x86_64/e820.h | 1
include/asm-x86_64/proto.h | 2 -
6 files changed, 32 insertions(+), 67 deletions(-)
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.17-rc1-103-x86_use_init_nodes/arch/x86_64/Kconfig linux-2.6.17-rc1-104-x86_64_use_init_nodes/arch/x86_64/Kconfig
--- linux-2.6.17-rc1-103-x86_use_init_nodes/arch/x86_64/Kconfig 2006-04-03 04:22:10.000000000 +0100
+++ linux-2.6.17-rc1-104-x86_64_use_init_nodes/arch/x86_64/Kconfig 2006-04-10 10:54:38.000000000 +0100
@@ -73,6 +73,9 @@ config ARCH_MAY_HAVE_PC_FDC
bool
default y

+config ARCH_POPULATES_NODE_MAP
+ def_bool y
+
config DMI
bool
default y
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.17-rc1-103-x86_use_init_nodes/arch/x86_64/kernel/e820.c linux-2.6.17-rc1-104-x86_64_use_init_nodes/arch/x86_64/kernel/e820.c
--- linux-2.6.17-rc1-103-x86_use_init_nodes/arch/x86_64/kernel/e820.c 2006-04-03 04:22:10.000000000 +0100
+++ linux-2.6.17-rc1-104-x86_64_use_init_nodes/arch/x86_64/kernel/e820.c 2006-04-10 10:54:38.000000000 +0100
@@ -220,6 +220,24 @@ e820_hole_size(unsigned long start_pfn,
return ((end - start) - ram) >> PAGE_SHIFT;
}

+/* Walk the e820 map and register active regions */
+unsigned long __init
+e820_register_active_regions(void)
+{
+ int i;
+ unsigned long start_pfn, end_pfn;
+ for (i = 0; i < e820.nr_map; i++) {
+ struct e820entry *ei = &e820.map[i];
+ if (ei->type != E820_RAM)
+ continue;
+
+ start_pfn = round_up(ei->addr, PAGE_SIZE);
+ end_pfn = round_down(ei->addr + ei->size, PAGE_SIZE);
+
+ add_active_range(0, start_pfn, end_pfn);
+ }
+}
+
/*
* Mark e820 reserved areas as busy for the resource manager.
*/
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.17-rc1-103-x86_use_init_nodes/arch/x86_64/mm/init.c linux-2.6.17-rc1-104-x86_64_use_init_nodes/arch/x86_64/mm/init.c
--- linux-2.6.17-rc1-103-x86_use_init_nodes/arch/x86_64/mm/init.c 2006-04-03 04:22:10.000000000 +0100
+++ linux-2.6.17-rc1-104-x86_64_use_init_nodes/arch/x86_64/mm/init.c 2006-04-10 10:54:38.000000000 +0100
@@ -405,69 +405,13 @@ void __cpuinit zap_low_mappings(int cpu)
__flush_tlb_all();
}

-/* Compute zone sizes for the DMA and DMA32 zones in a node. */
-__init void
-size_zones(unsigned long *z, unsigned long *h,
- unsigned long start_pfn, unsigned long end_pfn)
-{
- int i;
- unsigned long w;
-
- for (i = 0; i < MAX_NR_ZONES; i++)
- z[i] = 0;
-
- if (start_pfn < MAX_DMA_PFN)
- z[ZONE_DMA] = MAX_DMA_PFN - start_pfn;
- if (start_pfn < MAX_DMA32_PFN) {
- unsigned long dma32_pfn = MAX_DMA32_PFN;
- if (dma32_pfn > end_pfn)
- dma32_pfn = end_pfn;
- z[ZONE_DMA32] = dma32_pfn - start_pfn;
- }
- z[ZONE_NORMAL] = end_pfn - start_pfn;
-
- /* Remove lower zones from higher ones. */
- w = 0;
- for (i = 0; i < MAX_NR_ZONES; i++) {
- if (z[i])
- z[i] -= w;
- w += z[i];
- }
-
- /* Compute holes */
- w = start_pfn;
- for (i = 0; i < MAX_NR_ZONES; i++) {
- unsigned long s = w;
- w += z[i];
- h[i] = e820_hole_size(s, w);
- }
-
- /* Add the space pace needed for mem_map to the holes too. */
- for (i = 0; i < MAX_NR_ZONES; i++)
- h[i] += (z[i] * sizeof(struct page)) / PAGE_SIZE;
-
- /* The 16MB DMA zone has the kernel and other misc mappings.
- Account them too */
- if (h[ZONE_DMA]) {
- h[ZONE_DMA] += dma_reserve;
- if (h[ZONE_DMA] >= z[ZONE_DMA]) {
- printk(KERN_WARNING
- "Kernel too large and filling up ZONE_DMA?\n");
- h[ZONE_DMA] = z[ZONE_DMA];
- }
- }
-}
-
#ifndef CONFIG_NUMA
void __init paging_init(void)
{
- unsigned long zones[MAX_NR_ZONES], holes[MAX_NR_ZONES];
-
memory_present(0, 0, end_pfn);
sparse_init();
- size_zones(zones, holes, 0, end_pfn);
- free_area_init_node(0, NODE_DATA(0), zones,
- __pa(PAGE_OFFSET) >> PAGE_SHIFT, holes);
+ e820_register_active_regions();
+ free_area_init_nodes(MAX_DMA_PFN, MAX_DMA32_PFN, end_pfn, end_pfn);
}
#endif

diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.17-rc1-103-x86_use_init_nodes/arch/x86_64/mm/numa.c linux-2.6.17-rc1-104-x86_64_use_init_nodes/arch/x86_64/mm/numa.c
--- linux-2.6.17-rc1-103-x86_use_init_nodes/arch/x86_64/mm/numa.c 2006-04-03 04:22:10.000000000 +0100
+++ linux-2.6.17-rc1-104-x86_64_use_init_nodes/arch/x86_64/mm/numa.c 2006-04-10 10:54:38.000000000 +0100
@@ -149,13 +149,12 @@ void __init setup_node_bootmem(int nodei
void __init setup_node_zones(int nodeid)
{
unsigned long start_pfn, end_pfn, memmapsize, limit;
- unsigned long zones[MAX_NR_ZONES];
- unsigned long holes[MAX_NR_ZONES];

start_pfn = node_start_pfn(nodeid);
end_pfn = node_end_pfn(nodeid);
+ add_active_range(nodeid, start_pfn, end_pfn);

- Dprintk(KERN_INFO "Setting up node %d %lx-%lx\n",
+ Dprintk(KERN_INFO "Setting up memmap for node %d %lx-%lx\n",
nodeid, start_pfn, end_pfn);

/* Try to allocate mem_map at end to not fill up precious <4GB
@@ -167,10 +166,6 @@ void __init setup_node_zones(int nodeid)
memmapsize, SMP_CACHE_BYTES,
round_down(limit - memmapsize, PAGE_SIZE),
limit);
-
- size_zones(zones, holes, start_pfn, end_pfn);
- free_area_init_node(nodeid, NODE_DATA(nodeid), zones,
- start_pfn, holes);
}

void __init numa_init_array(void)
@@ -312,12 +307,18 @@ static void __init arch_sparse_init(void
void __init paging_init(void)
{
int i;
+ unsigned long max_normal_pfn = 0;

arch_sparse_init();

for_each_online_node(i) {
setup_node_zones(i);
+ if (max_normal_pfn < node_end_pfn(i))
+ max_normal_pfn = node_end_pfn(i);
}
+
+ free_area_init_nodes(MAX_DMA_PFN, MAX_DMA32_PFN, max_normal_pfn,
+ max_normal_pfn);
}

/* [numa=off] */
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.17-rc1-103-x86_use_init_nodes/include/asm-x86_64/e820.h linux-2.6.17-rc1-104-x86_64_use_init_nodes/include/asm-x86_64/e820.h
--- linux-2.6.17-rc1-103-x86_use_init_nodes/include/asm-x86_64/e820.h 2006-04-03 04:22:10.000000000 +0100
+++ linux-2.6.17-rc1-104-x86_64_use_init_nodes/include/asm-x86_64/e820.h 2006-04-10 10:54:38.000000000 +0100
@@ -53,6 +53,7 @@ extern void e820_bootmem_free(pg_data_t
extern void e820_setup_gap(void);
extern unsigned long e820_hole_size(unsigned long start_pfn,
unsigned long end_pfn);
+extern unsigned long e820_register_active_regions(void);

extern void __init parse_memopt(char *p, char **end);
extern void __init parse_memmapopt(char *p, char **end);
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.17-rc1-103-x86_use_init_nodes/include/asm-x86_64/proto.h linux-2.6.17-rc1-104-x86_64_use_init_nodes/include/asm-x86_64/proto.h
--- linux-2.6.17-rc1-103-x86_use_init_nodes/include/asm-x86_64/proto.h 2006-04-03 04:22:10.000000000 +0100
+++ linux-2.6.17-rc1-104-x86_64_use_init_nodes/include/asm-x86_64/proto.h 2006-04-10 10:54:38.000000000 +0100
@@ -24,8 +24,6 @@ extern void mtrr_bp_init(void);
#define mtrr_bp_init() do {} while (0)
#endif
extern void init_memory_mapping(unsigned long start, unsigned long end);
-extern void size_zones(unsigned long *z, unsigned long *h,
- unsigned long start_pfn, unsigned long end_pfn);

extern void system_call(void);
extern int kernel_syscall(void);
-
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