1 /* mmu.c: mmu memory info files
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
11 #include <linux/spinlock.h>
12 #include <linux/vmalloc.h>
13 #include <linux/highmem.h>
14 #include <asm/pgtable.h>
17 void get_vmalloc_info(struct vmalloc_info
*vmi
)
19 struct vm_struct
*vma
;
20 unsigned long free_area_size
;
21 unsigned long prev_end
;
26 vmi
->largest_chunk
= VMALLOC_TOTAL
;
29 vmi
->largest_chunk
= 0;
31 prev_end
= VMALLOC_START
;
33 read_lock(&vmlist_lock
);
35 for (vma
= vmlist
; vma
; vma
= vma
->next
) {
36 unsigned long addr
= (unsigned long) vma
->addr
;
39 * Some archs keep another range for modules in vmlist
41 if (addr
< VMALLOC_START
)
43 if (addr
>= VMALLOC_END
)
46 vmi
->used
+= vma
->size
;
48 free_area_size
= addr
- prev_end
;
49 if (vmi
->largest_chunk
< free_area_size
)
50 vmi
->largest_chunk
= free_area_size
;
52 prev_end
= vma
->size
+ addr
;
55 if (VMALLOC_END
- prev_end
> vmi
->largest_chunk
)
56 vmi
->largest_chunk
= VMALLOC_END
- prev_end
;
58 read_unlock(&vmlist_lock
);
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