test/debug/vmobjinfo.c

   1 /*
   2  * VMOBJINFO.C
   3  *
   4  * cc -I/usr/src/sys vmobjinfo.c -o ~/bin/vmobjinfo -lkvm
   5  *
   6  * Dump all vm_object's in the system
   7  *
   8  * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
   9  *
  10  * This code is derived from software contributed to The DragonFly Project
  11  * by Matthew Dillon <dillon@backplane.com>
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  *
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in
  21  *    the documentation and/or other materials provided with the
  22  *    distribution.
  23  * 3. Neither the name of The DragonFly Project nor the names of its
  24  *    contributors may be used to endorse or promote products derived
  25  *    from this software without specific, prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  30  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  31  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  32  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  33  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  34  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  35  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  36  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  37  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #define _KERNEL_STRUCTURES
  42 #include <sys/param.h>
  43 #include <sys/user.h>
  44 #include <sys/malloc.h>
  45 #include <sys/signalvar.h>
  46 #include <sys/namecache.h>
  47 #include <sys/mount.h>
  48 #include <sys/vnode.h>
  49 #include <sys/buf.h>
  50
  51 #include <vm/vm.h>
  52 #include <vm/vm_page.h>
  53 #include <vm/vm_kern.h>
  54 #include <vm/vm_object.h>
  55 #include <vm/swap_pager.h>
  56 #include <vm/vnode_pager.h>
  57
  58 #include <vfs/ufs/quota.h>
  59 #include <vfs/ufs/inode.h>
  60
  61 #include <stdio.h>
  62 #include <stdlib.h>
  63 #include <string.h>
  64 #include <fcntl.h>
  65 #include <kvm.h>
  66 #include <nlist.h>
  67 #include <getopt.h>
  68 #include <ctype.h>
  69
  70 TAILQ_HEAD(object_q, vm_object);
  71
  72 struct nlist Nl[] = {
  73     { "_vm_object_lists" },
  74     { "_nswdev" },
  75     { "_dmmax" },
  76     { NULL }
  77 };
  78
  79 int VerboseOpt;
  80 int nswdev;
  81 int dmmax;
  82 int memfds = -1;
  83 int *swapfds;
  84 char pgbuf[PAGE_SIZE];
  85
  86 static void scan_vmobjs(kvm_t *kd, struct object_q *obj_list);
  87 static void dump_swap(kvm_t *kd, struct swblock *swbp);
  88 static void dump_memq(kvm_t *kd, struct vm_page *pgp);
  89 static void kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes);
  90 static off_t devoffset(long blkno, int *whichp);
  91
  92 int
  93 main(int ac, char **av)
  94 {
  95     struct object_q obj_list[VMOBJ_HSIZE];
  96     kvm_t *kd;
  97     int i;
  98     int nswap;
  99     int ch;
 100     const char *corefile = NULL;
 101     const char *sysfile = NULL;
 102
 103     while ((ch = getopt(ac, av, "M:N:v")) != -1) {
 104         switch(ch) {
 105         case 'M':
 106             corefile = optarg;
 107             break;
 108         case 'N':
 109             sysfile = optarg;
 110             break;
 111         case 'v':
 112             ++VerboseOpt;
 113             break;
 114         default:
 115             fprintf(stderr, "%s [-M core] [-N system]\n", av[0]);
 116             exit(1);
 117         }
 118     }
 119     if ((kd = kvm_open(sysfile, corefile, NULL, O_RDONLY, "kvm:")) == NULL) {
 120         perror("kvm_open");
 121         exit(1);
 122     }
 123     if (kvm_nlist(kd, Nl) != 0) {
 124         perror("kvm_nlist");
 125         exit(1);
 126     }
 127     kkread(kd, Nl[1].n_value, &nswdev, sizeof(nswdev));
 128     kkread(kd, Nl[2].n_value, &dmmax, sizeof(dmmax));
 129
 130     if (VerboseOpt) {
 131         swapfds = calloc(sizeof(int), nswdev);
 132         for (i = 0; i < nswdev && i < ac - optind; ++i) {
 133                 printf("open %s\n", av[optind + i]);
 134                 swapfds[i] = open(av[optind + i], O_RDONLY);
 135         }
 136         while (i < nswdev) {
 137                 swapfds[i] = -1;
 138                 ++i;
 139         }
 140         memfds = open("/dev/mem", O_RDONLY);
 141     }
 142
 143     kkread(kd, Nl[0].n_value, obj_list, sizeof(obj_list));
 144     for (i = 0; i < VMOBJ_HSIZE; ++i)
 145             scan_vmobjs(kd, &obj_list[i]);
 146     return(0);
 147 }
 148
 149 static void
 150 scan_vmobjs(kvm_t *kd, struct object_q *obj_list)
 151 {
 152     struct vm_object *op;
 153     struct vm_object obj;
 154
 155     op = TAILQ_FIRST(obj_list);
 156     while (op) {
 157         kkread(kd, (long)op, &obj, sizeof(obj));
 158
 159         printf("%p type=%d size=%016jx handle=%p swblocks=%d\n",
 160                 op, obj.type, (intmax_t)obj.size, obj.handle,
 161                 obj.swblock_count);
 162         printf("\t\t   ref_count=%d backing_obj=%p\n",
 163                 obj.ref_count, obj.backing_object);
 164
 165         if (VerboseOpt) {
 166                 dump_swap(kd, obj.swblock_root.rbh_root);
 167                 if (obj.type == OBJT_DEFAULT || obj.type == OBJT_SWAP)
 168                         dump_memq(kd, obj.rb_memq.rbh_root);
 169         }
 170
 171         op = TAILQ_NEXT(&obj, object_list);
 172     }
 173 }
 174
 175 static void
 176 dump_swap(kvm_t *kd, struct swblock *swbp)
 177 {
 178         struct swblock swb;
 179         int which;
 180         int i;
 181         int j;
 182         int k;
 183         int fd;
 184         off_t off;
 185
 186         if (swbp == NULL)
 187                 return;
 188         kkread(kd, (long)swbp, &swb, sizeof(swb));
 189         dump_swap(kd, swb.swb_entry.rbe_left);
 190
 191         for (i = 0; i < SWAP_META_PAGES; ++i) {
 192                 printf("    %016lx: ", (swb.swb_index + i) * 4096L);
 193                 if (swb.swb_pages[i] == SWAPBLK_NONE) {
 194                         printf(" (unassigned)\n");
 195                         continue;
 196                 }
 197                 printf(" %ld\n", swb.swb_pages[i]);
 198                 off = devoffset(swb.swb_pages[i], &which);
 199                 if (swapfds[which] >= 0) {
 200                         lseek(swapfds[which], off, 0);
 201                         if (read(swapfds[which], pgbuf, sizeof(pgbuf)) <= 0)
 202                                 printf("\t(read failed)\n");
 203                         else
 204                         for (j = 0; j < PAGE_SIZE; j += 16) {
 205                                 printf("\t%04x ", j);
 206                                 for (k = 0; k < 16; ++k) {
 207                                         printf(" %02x", (uint8_t)pgbuf[j+k]);
 208                                         if (k == 7)
 209                                                 printf(" ");
 210                                 }
 211                                 printf("  ");
 212                                 for (k = 0; k < 16; ++k) {
 213                                         if (isprint((uint8_t)pgbuf[j+k]))
 214                                                 printf("%c", pgbuf[j+k]);
 215                                         else
 216                                                 printf(".");
 217                                 }
 218                                 printf("\n");
 219                         }
 220                 }
 221         }
 222
 223         dump_swap(kd, swb.swb_entry.rbe_right);
 224 }
 225
 226 static void
 227 dump_memq(kvm_t *kd, struct vm_page *pgp)
 228 {
 229         struct vm_page pg;
 230         int j;
 231         int k;
 232
 233         if (pgp == NULL)
 234                 return;
 235         kkread(kd, (long)pgp, &pg, sizeof(pg));
 236         dump_memq(kd, pg.rb_entry.rbe_left);
 237         printf("    %016lx: %016jx (physical)\n",
 238                pg.pindex * 4096L, (intmax_t)pg.phys_addr);
 239         lseek(memfds, pg.phys_addr, 0);
 240         if (read(memfds, pgbuf, sizeof(pgbuf)) <= 0) {
 241                 printf("\t(read failed)\n");
 242         } else {
 243                 for (j = 0; j < PAGE_SIZE; j += 16) {
 244                         printf("\t%04x ", j);
 245                         for (k = 0; k < 16; ++k) {
 246                                 printf(" %02x", (uint8_t)pgbuf[j+k]);
 247                                 if (k == 7)
 248                                         printf(" ");
 249                         }
 250                         printf("  ");
 251                         for (k = 0; k < 16; ++k) {
 252                                 if (isprint((uint8_t)pgbuf[j+k]))
 253                                         printf("%c", pgbuf[j+k]);
 254                                 else
 255                                         printf(".");
 256                         }
 257                         printf("\n");
 258                 }
 259         }
 260
 261         dump_memq(kd, pg.rb_entry.rbe_right);
 262 }
 263
 264 static void
 265 kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes)
 266 {
 267     if (kvm_read(kd, addr, buf, nbytes) != nbytes) {
 268         perror("kvm_read");
 269         exit(1);
 270     }
 271 }
 272
 273 static off_t
 274 devoffset(long blkno, int *whichp)
 275 {
 276         off_t off;
 277         long seg;
 278
 279         if (nswdev > 1) {
 280                 off = blkno % dmmax;
 281                 seg = blkno / dmmax;
 282                 *whichp = seg % nswdev;
 283                 seg /= nswdev;
 284                 off = (off_t)(seg * dmmax + off) << PAGE_SHIFT;
 285         } else {
 286                 *whichp = 0;
 287                 off = blkno * PAGE_SIZE;
 288         }
 289 }