fs/proc/task_mmu.c

   1 #include <linux/mm.h>
   2 #include <linux/hugetlb.h>
   3 #include <linux/mount.h>
   4 #include <linux/seq_file.h>
   5 #include <linux/highmem.h>
   6 #include <linux/pagemap.h>
   7 #include <linux/mempolicy.h>
   8
   9 #include <asm/elf.h>
  10 #include <asm/uaccess.h>
  11 #include <asm/tlbflush.h>
  12 #include "internal.h"
  13
  14 char *task_mem(struct mm_struct *mm, char *buffer)
  15 {
  16         unsigned long data, text, lib;
  17         unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
  18
  19         /*
  20          * Note: to minimize their overhead, mm maintains hiwater_vm and
  21          * hiwater_rss only when about to *lower* total_vm or rss.  Any
  22          * collector of these hiwater stats must therefore get total_vm
  23          * and rss too, which will usually be the higher.  Barriers? not
  24          * worth the effort, such snapshots can always be inconsistent.
  25          */
  26         hiwater_vm = total_vm = mm->total_vm;
  27         if (hiwater_vm < mm->hiwater_vm)
  28                 hiwater_vm = mm->hiwater_vm;
  29         hiwater_rss = total_rss = get_mm_rss(mm);
  30         if (hiwater_rss < mm->hiwater_rss)
  31                 hiwater_rss = mm->hiwater_rss;
  32
  33         data = mm->total_vm - mm->shared_vm - mm->stack_vm;
  34         text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
  35         lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
  36         buffer += sprintf(buffer,
  37                 "VmPeak:\t%8lu kB\n"
  38                 "VmSize:\t%8lu kB\n"
  39                 "VmLck:\t%8lu kB\n"
  40                 "VmHWM:\t%8lu kB\n"
  41                 "VmRSS:\t%8lu kB\n"
  42                 "VmData:\t%8lu kB\n"
  43                 "VmStk:\t%8lu kB\n"
  44                 "VmExe:\t%8lu kB\n"
  45                 "VmLib:\t%8lu kB\n"
  46                 "VmPTE:\t%8lu kB\n",
  47                 hiwater_vm << (PAGE_SHIFT-10),
  48                 (total_vm - mm->reserved_vm) << (PAGE_SHIFT-10),
  49                 mm->locked_vm << (PAGE_SHIFT-10),
  50                 hiwater_rss << (PAGE_SHIFT-10),
  51                 total_rss << (PAGE_SHIFT-10),
  52                 data << (PAGE_SHIFT-10),
  53                 mm->stack_vm << (PAGE_SHIFT-10), text, lib,
  54                 (PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10);
  55         return buffer;
  56 }
  57
  58 unsigned long task_vsize(struct mm_struct *mm)
  59 {
  60         return PAGE_SIZE * mm->total_vm;
  61 }
  62
  63 int task_statm(struct mm_struct *mm, int *shared, int *text,
  64                int *data, int *resident)
  65 {
  66         *shared = get_mm_counter(mm, file_rss);
  67         *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
  68                                                                 >> PAGE_SHIFT;
  69         *data = mm->total_vm - mm->shared_vm;
  70         *resident = *shared + get_mm_counter(mm, anon_rss);
  71         return mm->total_vm;
  72 }
  73
  74 int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
  75 {
  76         struct vm_area_struct * vma;
  77         int result = -ENOENT;
  78         struct task_struct *task = get_proc_task(inode);
  79         struct mm_struct * mm = NULL;
  80
  81         if (task) {
  82                 mm = get_task_mm(task);
  83                 put_task_struct(task);
  84         }
  85         if (!mm)
  86                 goto out;
  87         down_read(&mm->mmap_sem);
  88
  89         vma = mm->mmap;
  90         while (vma) {
  91                 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file)
  92                         break;
  93                 vma = vma->vm_next;
  94         }
  95
  96         if (vma) {
  97                 *mnt = mntget(vma->vm_file->f_vfsmnt);
  98                 *dentry = dget(vma->vm_file->f_dentry);
  99                 result = 0;
 100         }
 101
 102         up_read(&mm->mmap_sem);
 103         mmput(mm);
 104 out:
 105         return result;
 106 }
 107
 108 static void pad_len_spaces(struct seq_file *m, int len)
 109 {
 110         len = 25 + sizeof(void*) * 6 - len;
 111         if (len < 1)
 112                 len = 1;
 113         seq_printf(m, "%*c", len, ' ');
 114 }
 115
 116 struct mem_size_stats
 117 {
 118         unsigned long resident;
 119         unsigned long shared_clean;
 120         unsigned long shared_dirty;
 121         unsigned long private_clean;
 122         unsigned long private_dirty;
 123 };
 124
 125 __attribute__((weak)) const char *arch_vma_name(struct vm_area_struct *vma)
 126 {
 127         return NULL;
 128 }
 129
 130 static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
 131 {
 132         struct proc_maps_private *priv = m->private;
 133         struct task_struct *task = priv->task;
 134         struct vm_area_struct *vma = v;
 135         struct mm_struct *mm = vma->vm_mm;
 136         struct file *file = vma->vm_file;
 137         int flags = vma->vm_flags;
 138         unsigned long ino = 0;
 139         dev_t dev = 0;
 140         int len;
 141
 142         if (file) {
 143                 struct inode *inode = vma->vm_file->f_dentry->d_inode;
 144                 dev = inode->i_sb->s_dev;
 145                 ino = inode->i_ino;
 146         }
 147
 148         seq_printf(m, "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
 149                         vma->vm_start,
 150                         vma->vm_end,
 151                         flags & VM_READ ? 'r' : '-',
 152                         flags & VM_WRITE ? 'w' : '-',
 153                         flags & VM_EXEC ? 'x' : '-',
 154                         flags & VM_MAYSHARE ? 's' : 'p',
 155                         vma->vm_pgoff << PAGE_SHIFT,
 156                         MAJOR(dev), MINOR(dev), ino, &len);
 157
 158         /*
 159          * Print the dentry name for named mappings, and a
 160          * special [heap] marker for the heap:
 161          */
 162         if (file) {
 163                 pad_len_spaces(m, len);
 164                 seq_path(m, file->f_vfsmnt, file->f_dentry, "\n");
 165         } else {
 166                 const char *name = arch_vma_name(vma);
 167                 if (!name) {
 168                         if (mm) {
 169                                 if (vma->vm_start <= mm->start_brk &&
 170                                                 vma->vm_end >= mm->brk) {
 171                                         name = "[heap]";
 172                                 } else if (vma->vm_start <= mm->start_stack &&
 173                                            vma->vm_end >= mm->start_stack) {
 174                                         name = "[stack]";
 175                                 }
 176                         } else {
 177                                 name = "[vdso]";
 178                         }
 179                 }
 180                 if (name) {
 181                         pad_len_spaces(m, len);
 182                         seq_puts(m, name);
 183                 }
 184         }
 185         seq_putc(m, '\n');
 186
 187         if (mss)
 188                 seq_printf(m,
 189                            "Size:          %8lu kB\n"
 190                            "Rss:           %8lu kB\n"
 191                            "Shared_Clean:  %8lu kB\n"
 192                            "Shared_Dirty:  %8lu kB\n"
 193                            "Private_Clean: %8lu kB\n"
 194                            "Private_Dirty: %8lu kB\n",
 195                            (vma->vm_end - vma->vm_start) >> 10,
 196                            mss->resident >> 10,
 197                            mss->shared_clean  >> 10,
 198                            mss->shared_dirty  >> 10,
 199                            mss->private_clean >> 10,
 200                            mss->private_dirty >> 10);
 201
 202         if (m->count < m->size)  /* vma is copied successfully */
 203                 m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
 204         return 0;
 205 }
 206
 207 static int show_map(struct seq_file *m, void *v)
 208 {
 209         return show_map_internal(m, v, NULL);
 210 }
 211
 212 static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 213                                 unsigned long addr, unsigned long end,
 214                                 struct mem_size_stats *mss)
 215 {
 216         pte_t *pte, ptent;
 217         spinlock_t *ptl;
 218         struct page *page;
 219
 220         pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
 221         do {
 222                 ptent = *pte;
 223                 if (!pte_present(ptent))
 224                         continue;
 225
 226                 mss->resident += PAGE_SIZE;
 227
 228                 page = vm_normal_page(vma, addr, ptent);
 229                 if (!page)
 230                         continue;
 231
 232                 if (page_mapcount(page) >= 2) {
 233                         if (pte_dirty(ptent))
 234                                 mss->shared_dirty += PAGE_SIZE;
 235                         else
 236                                 mss->shared_clean += PAGE_SIZE;
 237                 } else {
 238                         if (pte_dirty(ptent))
 239                                 mss->private_dirty += PAGE_SIZE;
 240                         else
 241                                 mss->private_clean += PAGE_SIZE;
 242                 }
 243         } while (pte++, addr += PAGE_SIZE, addr != end);
 244         pte_unmap_unlock(pte - 1, ptl);
 245         cond_resched();
 246 }
 247
 248 static inline void smaps_pmd_range(struct vm_area_struct *vma, pud_t *pud,
 249                                 unsigned long addr, unsigned long end,
 250                                 struct mem_size_stats *mss)
 251 {
 252         pmd_t *pmd;
 253         unsigned long next;
 254
 255         pmd = pmd_offset(pud, addr);
 256         do {
 257                 next = pmd_addr_end(addr, end);
 258                 if (pmd_none_or_clear_bad(pmd))
 259                         continue;
 260                 smaps_pte_range(vma, pmd, addr, next, mss);
 261         } while (pmd++, addr = next, addr != end);
 262 }
 263
 264 static inline void smaps_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
 265                                 unsigned long addr, unsigned long end,
 266                                 struct mem_size_stats *mss)
 267 {
 268         pud_t *pud;
 269         unsigned long next;
 270
 271         pud = pud_offset(pgd, addr);
 272         do {
 273                 next = pud_addr_end(addr, end);
 274                 if (pud_none_or_clear_bad(pud))
 275                         continue;
 276                 smaps_pmd_range(vma, pud, addr, next, mss);
 277         } while (pud++, addr = next, addr != end);
 278 }
 279
 280 static inline void smaps_pgd_range(struct vm_area_struct *vma,
 281                                 unsigned long addr, unsigned long end,
 282                                 struct mem_size_stats *mss)
 283 {
 284         pgd_t *pgd;
 285         unsigned long next;
 286
 287         pgd = pgd_offset(vma->vm_mm, addr);
 288         do {
 289                 next = pgd_addr_end(addr, end);
 290                 if (pgd_none_or_clear_bad(pgd))
 291                         continue;
 292                 smaps_pud_range(vma, pgd, addr, next, mss);
 293         } while (pgd++, addr = next, addr != end);
 294 }
 295
 296 static int show_smap(struct seq_file *m, void *v)
 297 {
 298         struct vm_area_struct *vma = v;
 299         struct mem_size_stats mss;
 300
 301         memset(&mss, 0, sizeof mss);
 302         if (vma->vm_mm && !is_vm_hugetlb_page(vma))
 303                 smaps_pgd_range(vma, vma->vm_start, vma->vm_end, &mss);
 304         return show_map_internal(m, v, &mss);
 305 }
 306
 307 static void *m_start(struct seq_file *m, loff_t *pos)
 308 {
 309         struct proc_maps_private *priv = m->private;
 310         unsigned long last_addr = m->version;
 311         struct mm_struct *mm;
 312         struct vm_area_struct *vma, *tail_vma = NULL;
 313         loff_t l = *pos;
 314
 315         /* Clear the per syscall fields in priv */
 316         priv->task = NULL;
 317         priv->tail_vma = NULL;
 318
 319         /*
 320          * We remember last_addr rather than next_addr to hit with
 321          * mmap_cache most of the time. We have zero last_addr at
 322          * the beginning and also after lseek. We will have -1 last_addr
 323          * after the end of the vmas.
 324          */
 325
 326         if (last_addr == -1UL)
 327                 return NULL;
 328
 329         priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
 330         if (!priv->task)
 331                 return NULL;
 332
 333         mm = get_task_mm(priv->task);
 334         if (!mm)
 335                 return NULL;
 336
 337         priv->tail_vma = tail_vma = get_gate_vma(priv->task);
 338         down_read(&mm->mmap_sem);
 339
 340         /* Start with last addr hint */
 341         if (last_addr && (vma = find_vma(mm, last_addr))) {
 342                 vma = vma->vm_next;
 343                 goto out;
 344         }
 345
 346         /*
 347          * Check the vma index is within the range and do
 348          * sequential scan until m_index.
 349          */
 350         vma = NULL;
 351         if ((unsigned long)l < mm->map_count) {
 352                 vma = mm->mmap;
 353                 while (l-- && vma)
 354                         vma = vma->vm_next;
 355                 goto out;
 356         }
 357
 358         if (l != mm->map_count)
 359                 tail_vma = NULL; /* After gate vma */
 360
 361 out:
 362         if (vma)
 363                 return vma;
 364
 365         /* End of vmas has been reached */
 366         m->version = (tail_vma != NULL)? 0: -1UL;
 367         up_read(&mm->mmap_sem);
 368         mmput(mm);
 369         return tail_vma;
 370 }
 371
 372 static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma)
 373 {
 374         if (vma && vma != priv->tail_vma) {
 375                 struct mm_struct *mm = vma->vm_mm;
 376                 up_read(&mm->mmap_sem);
 377                 mmput(mm);
 378         }
 379 }
 380
 381 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 382 {
 383         struct proc_maps_private *priv = m->private;
 384         struct vm_area_struct *vma = v;
 385         struct vm_area_struct *tail_vma = priv->tail_vma;
 386
 387         (*pos)++;
 388         if (vma && (vma != tail_vma) && vma->vm_next)
 389                 return vma->vm_next;
 390         vma_stop(priv, vma);
 391         return (vma != tail_vma)? tail_vma: NULL;
 392 }
 393
 394 static void m_stop(struct seq_file *m, void *v)
 395 {
 396         struct proc_maps_private *priv = m->private;
 397         struct vm_area_struct *vma = v;
 398
 399         vma_stop(priv, vma);
 400         if (priv->task)
 401                 put_task_struct(priv->task);
 402 }
 403
 404 static struct seq_operations proc_pid_maps_op = {
 405         .start  = m_start,
 406         .next   = m_next,
 407         .stop   = m_stop,
 408         .show   = show_map
 409 };
 410
 411 static struct seq_operations proc_pid_smaps_op = {
 412         .start  = m_start,
 413         .next   = m_next,
 414         .stop   = m_stop,
 415         .show   = show_smap
 416 };
 417
 418 static int do_maps_open(struct inode *inode, struct file *file,
 419                         struct seq_operations *ops)
 420 {
 421         struct proc_maps_private *priv;
 422         int ret = -ENOMEM;
 423         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 424         if (priv) {
 425                 priv->pid = proc_pid(inode);
 426                 ret = seq_open(file, ops);
 427                 if (!ret) {
 428                         struct seq_file *m = file->private_data;
 429                         m->private = priv;
 430                 } else {
 431                         kfree(priv);
 432                 }
 433         }
 434         return ret;
 435 }
 436
 437 static int maps_open(struct inode *inode, struct file *file)
 438 {
 439         return do_maps_open(inode, file, &proc_pid_maps_op);
 440 }
 441
 442 struct file_operations proc_maps_operations = {
 443         .open           = maps_open,
 444         .read           = seq_read,
 445         .llseek         = seq_lseek,
 446         .release        = seq_release_private,
 447 };
 448
 449 #ifdef CONFIG_NUMA
 450 extern int show_numa_map(struct seq_file *m, void *v);
 451
 452 static struct seq_operations proc_pid_numa_maps_op = {
 453         .start  = m_start,
 454         .next   = m_next,
 455         .stop   = m_stop,
 456         .show   = show_numa_map
 457 };
 458
 459 static int numa_maps_open(struct inode *inode, struct file *file)
 460 {
 461         return do_maps_open(inode, file, &proc_pid_numa_maps_op);
 462 }
 463
 464 struct file_operations proc_numa_maps_operations = {
 465         .open           = numa_maps_open,
 466         .read           = seq_read,
 467         .llseek         = seq_lseek,
 468         .release        = seq_release_private,
 469 };
 470 #endif
 471
 472 static int smaps_open(struct inode *inode, struct file *file)
 473 {
 474         return do_maps_open(inode, file, &proc_pid_smaps_op);
 475 }
 476
 477 struct file_operations proc_smaps_operations = {
 478         .open           = smaps_open,
 479         .read           = seq_read,
 480         .llseek         = seq_lseek,
 481         .release        = seq_release_private,
 482 };