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