4 * cc -I/usr/src/sys vmpageinfo.c -o /usr/local/bin/vmpageinfo -lkvm
8 * Validate the vm_page_buckets[] hash array against the vm_page_array
11 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
13 * This code is derived from software contributed to The DragonFly Project
14 * by Matthew Dillon <dillon@backplane.com>
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in
24 * the documentation and/or other materials provided with the
26 * 3. Neither the name of The DragonFly Project nor the names of its
27 * contributors may be used to endorse or promote products derived
28 * from this software without specific, prior written permission.
30 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
31 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
32 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
33 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
34 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
35 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
36 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
38 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
39 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
40 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 * $DragonFly: src/test/debug/vmpageinfo.c,v 1.1 2004/11/09 21:50:12 dillon Exp $
46 #define _KERNEL_STRUCTURES_
47 #include <sys/param.h>
49 #include <sys/malloc.h>
50 #include <sys/signalvar.h>
51 #include <sys/vnode.h>
52 #include <sys/namecache.h>
55 #include <vm/vm_page.h>
56 #include <vm/vm_kern.h>
57 #include <vm/vm_page.h>
58 #include <vm/vm_object.h>
59 #include <vm/swap_pager.h>
60 #include <vm/vnode_pager.h>
71 { "_vm_page_buckets" },
72 { "_vm_page_hash_mask" },
74 { "_vm_page_array_size" },
79 struct vm_page **vm_page_buckets;
80 int vm_page_hash_mask;
81 struct vm_page *vm_page_array;
82 int vm_page_array_size;
84 void checkpage(kvm_t *kd, vm_page_t mptr, vm_page_t m, struct vm_object *obj);
85 void kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes);
88 main(int ac, char **av)
90 const char *corefile = NULL;
91 const char *sysfile = NULL;
100 while ((ch = getopt(ac, av, "M:N:d")) != -1) {
112 fprintf(stderr, "%s [-M core] [-N system]\n", av[0]);
119 if ((kd = kvm_open(sysfile, corefile, NULL, O_RDONLY, "kvm:")) == NULL) {
123 if (kvm_nlist(kd, Nl) != 0) {
128 kkread(kd, Nl[0].n_value, &vm_page_buckets, sizeof(vm_page_buckets));
129 kkread(kd, Nl[1].n_value, &vm_page_hash_mask, sizeof(vm_page_hash_mask));
130 kkread(kd, Nl[2].n_value, &vm_page_array, sizeof(vm_page_array));
131 kkread(kd, Nl[3].n_value, &vm_page_array_size, sizeof(vm_page_array_size));
134 * Scan the vm_page_array validating all pages with associated objects
136 for (i = 0; i < vm_page_array_size; ++i) {
138 printf("page %d\r", i);
141 kkread(kd, (u_long)&vm_page_array[i], &m, sizeof(m));
143 kkread(kd, (u_long)m.object, &obj, sizeof(obj));
144 checkpage(kd, &vm_page_array[i], &m, &obj);
151 * Scan the vm_page_buckets array validating all pages found
153 for (i = 0; i <= vm_page_hash_mask; ++i) {
155 printf("index %d\r", i);
158 kkread(kd, (u_long)&vm_page_buckets[i], &mptr, sizeof(mptr));
160 kkread(kd, (u_long)mptr, &m, sizeof(m));
162 kkread(kd, (u_long)m.object, &obj, sizeof(obj));
163 hv = ((uintptr_t)m.object + m.pindex) ^ obj.hash_rand;
164 hv &= vm_page_hash_mask;
166 printf("vm_page_buckets[%d] ((struct vm_page *)%p)"
167 " should be in bucket %d\n", i, mptr, hv);
168 checkpage(kd, mptr, &m, &obj);
170 printf("vm_page_buckets[%d] ((struct vm_page *)%p)"
171 " has no object\n", i, mptr);
182 * A page with an object.
185 checkpage(kvm_t *kd, vm_page_t mptr, vm_page_t m, struct vm_object *obj)
191 hv = ((uintptr_t)m->object + m->pindex) ^ obj->hash_rand;
192 hv &= vm_page_hash_mask;
193 kkread(kd, (u_long)&vm_page_buckets[hv], &scanptr, sizeof(scanptr));
197 kkread(kd, (u_long)scanptr, &scan, sizeof(scan));
198 scanptr = scan.hnext;
202 printf("good checkpage %p bucket %d\n", mptr, hv);
204 printf("vm_page_buckets[%d] ((struct vm_page *)%p)"
205 " page not found in bucket list\n", hv, mptr);
210 kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes)
212 if (kvm_read(kd, addr, buf, nbytes) != nbytes) {