blob: 25d2d9c6e329c6b0eb04524cd80d2538cb3f4118 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* mmu.c: mmu memory info files
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/time.h>
15#include <linux/kernel.h>
16#include <linux/string.h>
17#include <linux/mman.h>
18#include <linux/proc_fs.h>
19#include <linux/mm.h>
20#include <linux/mmzone.h>
21#include <linux/pagemap.h>
22#include <linux/swap.h>
23#include <linux/slab.h>
24#include <linux/smp.h>
25#include <linux/seq_file.h>
26#include <linux/hugetlb.h>
27#include <linux/vmalloc.h>
28#include <asm/uaccess.h>
29#include <asm/pgtable.h>
30#include <asm/tlb.h>
31#include <asm/div64.h>
32#include "internal.h"
33
34void get_vmalloc_info(struct vmalloc_info *vmi)
35{
36 struct vm_struct *vma;
37 unsigned long free_area_size;
38 unsigned long prev_end;
39
40 vmi->used = 0;
41
42 if (!vmlist) {
43 vmi->largest_chunk = VMALLOC_TOTAL;
44 }
45 else {
46 vmi->largest_chunk = 0;
47
48 prev_end = VMALLOC_START;
49
50 read_lock(&vmlist_lock);
51
52 for (vma = vmlist; vma; vma = vma->next) {
Hugh Dickins64d13c02005-05-16 21:53:09 -070053 unsigned long addr = (unsigned long) vma->addr;
54
55 /*
56 * Some archs keep another range for modules in vmlist
57 */
58 if (addr < VMALLOC_START)
59 continue;
60 if (addr >= VMALLOC_END)
61 break;
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 vmi->used += vma->size;
64
Hugh Dickins64d13c02005-05-16 21:53:09 -070065 free_area_size = addr - prev_end;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 if (vmi->largest_chunk < free_area_size)
67 vmi->largest_chunk = free_area_size;
68
Hugh Dickins64d13c02005-05-16 21:53:09 -070069 prev_end = vma->size + addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 }
71
72 if (VMALLOC_END - prev_end > vmi->largest_chunk)
73 vmi->largest_chunk = VMALLOC_END - prev_end;
74
75 read_unlock(&vmlist_lock);
76 }
77}