1/* 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) {
53			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
63			vmi->used += vma->size;
64
65			free_area_size = addr - prev_end;
66			if (vmi->largest_chunk < free_area_size)
67				vmi->largest_chunk = free_area_size;
68
69			prev_end = vma->size + addr;
70		}
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}
78