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Subject[PATCH] x86: 32 bit use e820_register_active_regions
Date

so 32bit is more like 64bit, and more smart with combining e820 and numa.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

Index: linux-2.6/arch/x86/kernel/setup_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_32.c
+++ linux-2.6/arch/x86/kernel/setup_32.c
@@ -406,11 +406,12 @@ static void __init zone_sizes_init(void)
max_zone_pfns[ZONE_DMA] =
virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+ remove_all_active_ranges();
#ifdef CONFIG_HIGHMEM
max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
- add_active_range(0, 0, highend_pfn);
+ e820_register_active_regions(0, 0, highend_pfn);
#else
- add_active_range(0, 0, max_low_pfn);
+ e820_register_active_regions(0, 0, max_low_pfn);
#endif

free_area_init_nodes(max_zone_pfns);
@@ -583,6 +584,7 @@ static void __init relocate_initrd(void)

void __init setup_bootmem_allocator(void)
{
+ int i;
unsigned long bootmap_size, bootmap;
/*
* Initialize the boot-time allocator (with low memory only):
@@ -604,7 +606,8 @@ void __init setup_bootmem_allocator(void
min_low_pfn<<PAGE_SHIFT, max_low_pfn<<PAGE_SHIFT);
printk(KERN_INFO " bootmap %08lx - %08lx\n",
bootmap, bootmap + bootmap_size);
- register_bootmem_low_pages(max_low_pfn);
+ for_each_online_node(i)
+ free_bootmem_with_active_regions(i, max_low_pfn);
early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);

#ifdef CONFIG_ACPI_SLEEP
@@ -745,11 +748,20 @@ void __init setup_arch(char **cmdline_p)
if (efi_enabled)
efi_init();

+ e820_register_active_regions(0, 0, -1UL);
+ /*
+ * partially used pages are not usable - thus
+ * we are rounding upwards:
+ */
+ max_pfn = e820_end_of_ram();
+
/* update e820 for memory not covered by WB MTRRs */
- find_max_pfn();
mtrr_bp_init();
- if (mtrr_trim_uncached_memory(max_pfn))
- find_max_pfn();
+ if (mtrr_trim_uncached_memory(max_pfn)) {
+ remove_all_active_ranges();
+ e820_register_active_regions(0, 0, -1UL);
+ max_pfn = e820_end_of_ram();
+ }

max_low_pfn = setup_memory();

Index: linux-2.6/arch/x86/mm/discontig_32.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/discontig_32.c
+++ linux-2.6/arch/x86/mm/discontig_32.c
@@ -120,10 +120,9 @@ int __init get_memcfg_numa_flat(void)
{
printk("NUMA - single node, flat memory mode\n");

- /* Run the memory configuration and find the top of memory. */
- find_max_pfn();
node_start_pfn[0] = 0;
node_end_pfn[0] = max_pfn;
+ e820_register_active_regions(0, 0, max_pfn);
memory_present(0, 0, max_pfn);
node_remap_size[0] = node_memmap_size_bytes(0, 0, max_pfn);

@@ -315,6 +314,11 @@ unsigned long __init setup_memory(void)
* this space and use it to adjust the boundary between ZONE_NORMAL
* and ZONE_HIGHMEM.
*/
+
+ /* call find_max_low_pfn at first, it could update max_pfn */
+ system_max_low_pfn = max_low_pfn = find_max_low_pfn();
+
+ remove_all_active_ranges();
get_memcfg_numa();

kva_pages = round_up(calculate_numa_remap_pages(), PTRS_PER_PTE);
@@ -322,7 +326,6 @@ unsigned long __init setup_memory(void)
/* partially used pages are not usable - thus round upwards */
system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end);

- system_max_low_pfn = max_low_pfn = find_max_low_pfn();
kva_target_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE);
do {
kva_start_pfn = find_e820_area(kva_target_pfn<<PAGE_SHIFT,
@@ -380,7 +383,6 @@ unsigned long __init setup_memory(void)

void __init zone_sizes_init(void)
{
- int nid;
unsigned long max_zone_pfns[MAX_NR_ZONES];
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
max_zone_pfns[ZONE_DMA] =
@@ -390,15 +392,6 @@ void __init zone_sizes_init(void)
max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
#endif

- /* If SRAT has not registered memory, register it now */
- if (find_max_pfn_with_active_regions() == 0) {
- for_each_online_node(nid) {
- if (node_has_online_mem(nid))
- add_active_range(nid, node_start_pfn[nid],
- node_end_pfn[nid]);
- }
- }
-
free_area_init_nodes(max_zone_pfns);
return;
}
Index: linux-2.6/arch/x86/kernel/numaq_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/numaq_32.c
+++ linux-2.6/arch/x86/kernel/numaq_32.c
@@ -32,6 +32,7 @@
#include <asm/topology.h>
#include <asm/processor.h>
#include <asm/mpspec.h>
+#include <asm/e820.h>

#define MB_TO_PAGES(addr) ((addr) << (20 - PAGE_SHIFT))

@@ -61,6 +62,8 @@ static void __init smp_dump_qct(void)
node_end_pfn[node] = MB_TO_PAGES(
eq->hi_shrd_mem_start + eq->hi_shrd_mem_size);

+ e820_register_active_regions(node, node_start_pfn[node],
+ node_end_pfn[node]);
memory_present(node,
node_start_pfn[node], node_end_pfn[node]);
node_remap_size[node] = node_memmap_size_bytes(node,
Index: linux-2.6/arch/x86/kernel/e820_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/e820_32.c
+++ linux-2.6/arch/x86/kernel/e820_32.c
@@ -207,69 +207,6 @@ void __init init_iomem_resources(struct
}
}

-/*
- * Find the highest page frame number we have available
- */
-void __init find_max_pfn(void)
-{
- int i;
-
- max_pfn = 0;
-
- for (i = 0; i < e820.nr_map; i++) {
- unsigned long start, end;
- /* RAM? */
- if (e820.map[i].type != E820_RAM)
- continue;
- start = PFN_UP(e820.map[i].addr);
- end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
- if (start >= end)
- continue;
- if (end > max_pfn)
- max_pfn = end;
- }
-}
-
-/*
- * Register fully available low RAM pages with the bootmem allocator.
- */
-void __init register_bootmem_low_pages(unsigned long max_low_pfn)
-{
- int i;
-
- for (i = 0; i < e820.nr_map; i++) {
- unsigned long curr_pfn, last_pfn, size;
- /*
- * Reserve usable low memory
- */
- if (e820.map[i].type != E820_RAM)
- continue;
- /*
- * We are rounding up the start address of usable memory:
- */
- curr_pfn = PFN_UP(e820.map[i].addr);
- if (curr_pfn >= max_low_pfn)
- continue;
- /*
- * ... and at the end of the usable range downwards:
- */
- last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
-
- if (last_pfn > max_low_pfn)
- last_pfn = max_low_pfn;
-
- /*
- * .. finally, did all the rounding and playing
- * around just make the area go away?
- */
- if (last_pfn <= curr_pfn)
- continue;
-
- size = last_pfn - curr_pfn;
- free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
- }
-}
-
void __init limit_regions(unsigned long long size)
{
unsigned long long current_addr;
@@ -360,8 +297,9 @@ static int __init parse_memmap(char *arg
* size before original memory map is
* reset.
*/
- find_max_pfn();
- saved_max_pfn = max_pfn;
+ e820_register_active_regions(0, 0, -1UL);
+ saved_max_pfn = e820_end_of_ram();
+ remove_all_active_ranges();
#endif
e820.nr_map = 0;
user_defined_memmap = 1;
Index: linux-2.6/arch/x86/kernel/srat_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/srat_32.c
+++ linux-2.6/arch/x86/kernel/srat_32.c
@@ -31,6 +31,7 @@
#include <asm/srat.h>
#include <asm/topology.h>
#include <asm/smp.h>
+#include <asm/e820.h>

/*
* proximity macros and definitions
@@ -244,7 +245,8 @@ static int __init acpi20_parse_srat(stru
printk("chunk %d nid %d start_pfn %08lx end_pfn %08lx\n",
j, chunk->nid, chunk->start_pfn, chunk->end_pfn);
node_read_chunk(chunk->nid, chunk);
- add_active_range(chunk->nid, chunk->start_pfn, chunk->end_pfn);
+ e820_register_active_regions(chunk->nid, chunk->start_pfn,
+ min(chunk->end_pfn, max_pfn));
}

for_each_online_node(nid) {
Index: linux-2.6/include/asm-x86/e820_32.h
===================================================================
--- linux-2.6.orig/include/asm-x86/e820_32.h
+++ linux-2.6/include/asm-x86/e820_32.h
@@ -21,8 +21,6 @@
extern void setup_memory_map(void);
extern void finish_e820_parsing(void);

-extern void find_max_pfn(void);
-extern void register_bootmem_low_pages(unsigned long max_low_pfn);
extern void limit_regions(unsigned long long size);
extern void init_iomem_resources(struct resource *code_resource,
struct resource *data_resource,

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