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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2006-07-07 00:26:02 +0900
committerRalf Baechle <ralf@linux-mips.org>2006-07-13 21:26:08 +0100
commit565200a14641eb7ab7b96a726441f2e4d663d15c (patch)
treee9008e42975537314440c21b93b3d4a1f873f577 /arch/mips
parent7de58fab9ccb63b4194ce39cf163a7491921d037 (diff)
downloadop-kernel-dev-565200a14641eb7ab7b96a726441f2e4d663d15c.zip
op-kernel-dev-565200a14641eb7ab7b96a726441f2e4d663d15c.tar.gz
[MIPS] Do not count pages in holes with sparsemem
With some memory model other than FLATMEM, the single node can contains some holes so there might be many invalid pages. For example, with two 256M memory and one 256M hole, some variables (num_physpage, totalpages, nr_kernel_pages, nr_all_pages, etc.) will indicate that there are 768MB on this system. This is not desired because, for example, alloc_large_system_hash() allocates too many entries. Use free_area_init_node() with counted zholes_size[] instead of free_area_init(). For num_physpages, use number of ram pages instead of max_low_pfn. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/mm/init.c65
1 files changed, 40 insertions, 25 deletions
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 802bdd3..c52497b 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -139,10 +139,36 @@ void __init fixrange_init(unsigned long start, unsigned long end,
#ifndef CONFIG_NEED_MULTIPLE_NODES
extern void pagetable_init(void);
+static int __init page_is_ram(unsigned long pagenr)
+{
+ int i;
+
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ unsigned long addr, end;
+
+ if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+ /* not usable memory */
+ continue;
+
+ addr = PFN_UP(boot_mem_map.map[i].addr);
+ end = PFN_DOWN(boot_mem_map.map[i].addr +
+ boot_mem_map.map[i].size);
+
+ if (pagenr >= addr && pagenr < end)
+ return 1;
+ }
+
+ return 0;
+}
+
void __init paging_init(void)
{
- unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+ unsigned long zones_size[] = { [0 ... MAX_NR_ZONES - 1] = 0 };
unsigned long max_dma, high, low;
+#ifndef CONFIG_FLATMEM
+ unsigned long zholes_size[] = { [0 ... MAX_NR_ZONES - 1] = 0 };
+ unsigned long i, j, pfn;
+#endif
pagetable_init();
@@ -174,29 +200,16 @@ void __init paging_init(void)
zones_size[ZONE_HIGHMEM] = high - low;
#endif
+#ifdef CONFIG_FLATMEM
free_area_init(zones_size);
-}
-
-static inline int page_is_ram(unsigned long pagenr)
-{
- int i;
-
- for (i = 0; i < boot_mem_map.nr_map; i++) {
- unsigned long addr, end;
-
- if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
- /* not usable memory */
- continue;
-
- addr = PFN_UP(boot_mem_map.map[i].addr);
- end = PFN_DOWN(boot_mem_map.map[i].addr +
- boot_mem_map.map[i].size);
-
- if (pagenr >= addr && pagenr < end)
- return 1;
- }
-
- return 0;
+#else
+ pfn = 0;
+ for (i = 0; i < MAX_NR_ZONES; i++)
+ for (j = 0; j < zones_size[i]; j++, pfn++)
+ if (!page_is_ram(pfn))
+ zholes_size[i]++;
+ free_area_init_node(0, NODE_DATA(0), zones_size, 0, zholes_size);
+#endif
}
static struct kcore_list kcore_mem, kcore_vmalloc;
@@ -213,9 +226,9 @@ void __init mem_init(void)
#ifdef CONFIG_DISCONTIGMEM
#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
#endif
- max_mapnr = num_physpages = highend_pfn;
+ max_mapnr = highend_pfn;
#else
- max_mapnr = num_physpages = max_low_pfn;
+ max_mapnr = max_low_pfn;
#endif
high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
@@ -229,6 +242,7 @@ void __init mem_init(void)
if (PageReserved(pfn_to_page(tmp)))
reservedpages++;
}
+ num_physpages = ram;
#ifdef CONFIG_HIGHMEM
for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
@@ -247,6 +261,7 @@ void __init mem_init(void)
totalhigh_pages++;
}
totalram_pages += totalhigh_pages;
+ num_physpages += totalhigh_pages;
#endif
codesize = (unsigned long) &_etext - (unsigned long) &_text;
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