projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* mmu.c: mmu memory info files |
| 2 | * | |
| 3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | |
| 4 | * Written by David Howells ([email protected]) | |
| 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 | */ | |
| 87400c04 | 11 | #include <linux/spinlock.h> |
| 1da177e4 | 12 | #include <linux/vmalloc.h> |
| 87400c04 | 13 | #include <linux/highmem.h> |
| 1da177e4 | 14 | #include <asm/pgtable.h> |
| 1da177e4 LT |
15 | #include "internal.h" |
| 16 | ||
| 17 | void get_vmalloc_info(struct vmalloc_info *vmi) | |
| 18 | { | |
| 19 | struct vm_struct *vma; | |
| 20 | unsigned long free_area_size; | |
| 21 | unsigned long prev_end; | |
| 22 | ||
| 23 | vmi->used = 0; | |
| 24 | ||
| 25 | if (!vmlist) { | |
| 26 | vmi->largest_chunk = VMALLOC_TOTAL; | |
| 27 | } | |
| 28 | else { | |
| 29 | vmi->largest_chunk = 0; | |
| 30 | ||
| 31 | prev_end = VMALLOC_START; | |
| 32 | ||
| 33 | read_lock(&vmlist_lock); | |
| 34 | ||
| 35 | for (vma = vmlist; vma; vma = vma->next) { | |
| 64d13c00 HD |
36 | unsigned long addr = (unsigned long) vma->addr; |
| 37 | ||
| 38 | /* | |
| 39 | * Some archs keep another range for modules in vmlist | |
| 40 | */ | |
| 41 | if (addr < VMALLOC_START) | |
| 42 | continue; | |
| 43 | if (addr >= VMALLOC_END) | |
| 44 | break; | |
| 45 | ||
| 1da177e4 LT |
46 | vmi->used += vma->size; |
| 47 | ||
| 64d13c00 | 48 | free_area_size = addr - prev_end; |
| 1da177e4 LT |
49 | if (vmi->largest_chunk < free_area_size) |
| 50 | vmi->largest_chunk = free_area_size; | |
| 51 | ||
| 64d13c00 | 52 | prev_end = vma->size + addr; |
| 1da177e4 LT |
53 | } |
| 54 | ||
| 55 | if (VMALLOC_END - prev_end > vmi->largest_chunk) | |
| 56 | vmi->largest_chunk = VMALLOC_END - prev_end; | |
| 57 | ||
| 58 | read_unlock(&vmlist_lock); | |
| 59 | } | |
| 60 | } |