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mm: introduce helper function mem_init_print_info() to simplify mem_init()

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Introduce helper function mem_init_print_info() to simplify mem_init()
across different architectures, which also unifies the format and
information printed.

Function mem_init_print_info() calculates memory statistics information
without walking each page, so it should be a little faster on some
architectures.

Also introduce another helper get_num_physpages() to kill the global
variable num_physpages.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michel Lespinasse <walken@google.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jiang Liu 2013-07-03 15:03:41 -07:00 committed by Linus Torvalds
parent a214a8c68b
commit 7ee3d4e8cd
2 changed files with 64 additions and 0 deletions
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12
include/linux/mm.h
View File

@ -1323,6 +1323,7 @@ extern void free_highmem_page(struct page *page);
#endif
extern void adjust_managed_page_count(struct page *page, long count);
extern void mem_init_print_info(const char *str);
/* Free the reserved page into the buddy system, so it gets managed. */
static inline void __free_reserved_page(struct page *page)
@ -1358,6 +1359,17 @@ static inline unsigned long free_initmem_default(int poison)
poison, "unused kernel");
}
static inline unsigned long get_num_physpages(void)
{
int nid;
unsigned long phys_pages = 0;
for_each_online_node(nid)
phys_pages += node_present_pages(nid);
return phys_pages;
}
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
/*
* With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its

52
mm/page_alloc.c
View File

@ -61,6 +61,7 @@
#include <linux/hugetlb.h>
#include <linux/sched/rt.h>
#include <asm/sections.h>
#include <asm/tlbflush.h>
#include <asm/div64.h>
#include "internal.h"
@ -5246,6 +5247,57 @@ void free_highmem_page(struct page *page)
}
#endif
void __init mem_init_print_info(const char *str)
{
unsigned long physpages, codesize, datasize, rosize, bss_size;
unsigned long init_code_size, init_data_size;
physpages = get_num_physpages();
codesize = _etext - _stext;
datasize = _edata - _sdata;
rosize = __end_rodata - __start_rodata;
bss_size = __bss_stop - __bss_start;
init_data_size = __init_end - __init_begin;
init_code_size = _einittext - _sinittext;
/*
* Detect special cases and adjust section sizes accordingly:
* 1) .init.* may be embedded into .data sections
* 2) .init.text.* may be out of [__init_begin, __init_end],
* please refer to arch/tile/kernel/vmlinux.lds.S.
* 3) .rodata.* may be embedded into .text or .data sections.
*/
#define adj_init_size(start, end, size, pos, adj) \
if (start <= pos && pos < end && size > adj) \
size -= adj;
adj_init_size(__init_begin, __init_end, init_data_size,
_sinittext, init_code_size);
adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size);
adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size);
adj_init_size(_stext, _etext, codesize, __start_rodata, rosize);
adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize);
#undef adj_init_size
printk("Memory: %luK/%luK available "
"(%luK kernel code, %luK rwdata, %luK rodata, "
"%luK init, %luK bss, %luK reserved"
#ifdef CONFIG_HIGHMEM
", %luK highmem"
#endif
"%s%s)\n",
nr_free_pages() << (PAGE_SHIFT-10), physpages << (PAGE_SHIFT-10),
codesize >> 10, datasize >> 10, rosize >> 10,
(init_data_size + init_code_size) >> 10, bss_size >> 10,
(physpages - totalram_pages) << (PAGE_SHIFT-10),
#ifdef CONFIG_HIGHMEM
totalhigh_pages << (PAGE_SHIFT-10),
#endif
str ? ", " : "", str ? str : "");
}
/**
* set_dma_reserve - set the specified number of pages reserved in the first zone
* @new_dma_reserve: The number of pages to mark reserved