61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
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/* mmu.c: mmu memory info files
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*
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* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/spinlock.h>
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#include <linux/vmalloc.h>
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#include <linux/highmem.h>
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#include <asm/pgtable.h>
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#include "internal.h"
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void get_vmalloc_info(struct vmalloc_info *vmi)
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{
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struct vm_struct *vma;
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unsigned long free_area_size;
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unsigned long prev_end;
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vmi->used = 0;
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if (!vmlist) {
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vmi->largest_chunk = VMALLOC_TOTAL;
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}
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else {
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vmi->largest_chunk = 0;
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prev_end = VMALLOC_START;
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read_lock(&vmlist_lock);
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for (vma = vmlist; vma; vma = vma->next) {
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unsigned long addr = (unsigned long) vma->addr;
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/*
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* Some archs keep another range for modules in vmlist
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*/
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if (addr < VMALLOC_START)
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continue;
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if (addr >= VMALLOC_END)
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break;
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vmi->used += vma->size;
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free_area_size = addr - prev_end;
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if (vmi->largest_chunk < free_area_size)
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vmi->largest_chunk = free_area_size;
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prev_end = vma->size + addr;
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}
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if (VMALLOC_END - prev_end > vmi->largest_chunk)
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vmi->largest_chunk = VMALLOC_END - prev_end;
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read_unlock(&vmlist_lock);
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}
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}
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