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_path.mnt);
  98                 *dentry = dget(vma->vm_file->f_path.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 static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
 126 {
 127         struct proc_maps_private *priv = m->private;
 128         struct task_struct *task = priv->task;
 129         struct vm_area_struct *vma = v;
 130         struct mm_struct *mm = vma->vm_mm;
 131         struct file *file = vma->vm_file;
 132         int flags = vma->vm_flags;
 133         unsigned long ino = 0;
 134         dev_t dev = 0;
 135         int len;
 136
 137         if (file) {
 138                 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
 139                 dev = inode->i_sb->s_dev;
 140                 ino = inode->i_ino;
 141         }
 142
 143         seq_printf(m, "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
 144                         vma->vm_start,
 145                         vma->vm_end,
 146                         flags & VM_READ ? 'r' : '-',
 147                         flags & VM_WRITE ? 'w' : '-',
 148                         flags & VM_EXEC ? 'x' : '-',
 149                         flags & VM_MAYSHARE ? 's' : 'p',
 150                         vma->vm_pgoff << PAGE_SHIFT,
 151                         MAJOR(dev), MINOR(dev), ino, &len);
 152
 153         /*
 154          * Print the dentry name for named mappings, and a
 155          * special [heap] marker for the heap:
 156          */
 157         if (file) {
 158                 pad_len_spaces(m, len);
 159                 seq_path(m, file->f_path.mnt, file->f_path.dentry, "\n");
 160         } else {
 161                 const char *name = arch_vma_name(vma);
 162                 if (!name) {
 163                         if (mm) {
 164                                 if (vma->vm_start <= mm->start_brk &&
 165                                                 vma->vm_end >= mm->brk) {
 166                                         name = "[heap]";
 167                                 } else if (vma->vm_start <= mm->start_stack &&
 168                                            vma->vm_end >= mm->start_stack) {
 169                                         name = "[stack]";
 170                                 }
 171                         } else {
 172                                 name = "[vdso]";
 173                         }
 174                 }
 175                 if (name) {
 176                         pad_len_spaces(m, len);
 177                         seq_puts(m, name);
 178                 }
 179         }
 180         seq_putc(m, '\n');
 181
 182         if (mss)
 183                 seq_printf(m,
 184                            "Size:          %8lu kB\n"
 185                            "Rss:           %8lu kB\n"
 186                            "Shared_Clean:  %8lu kB\n"
 187                            "Shared_Dirty:  %8lu kB\n"
 188                            "Private_Clean: %8lu kB\n"
 189                            "Private_Dirty: %8lu kB\n",
 190                            (vma->vm_end - vma->vm_start) >> 10,
 191                            mss->resident >> 10,
 192                            mss->shared_clean  >> 10,
 193                            mss->shared_dirty  >> 10,
 194                            mss->private_clean >> 10,
 195                            mss->private_dirty >> 10);
 196
 197         if (m->count < m->size)  /* vma is copied successfully */
 198                 m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
 199         return 0;
 200 }
 201
 202 static int show_map(struct seq_file *m, void *v)
 203 {
 204         return show_map_internal(m, v, NULL);
 205 }
 206
 207 static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 208                                 unsigned long addr, unsigned long end,
 209                                 struct mem_size_stats *mss)
 210 {
 211         pte_t *pte, ptent;
 212         spinlock_t *ptl;
 213         struct page *page;
 214
 215         pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
 216         do {
 217                 ptent = *pte;
 218                 if (!pte_present(ptent))
 219                         continue;
 220
 221                 mss->resident += PAGE_SIZE;
 222
 223                 page = vm_normal_page(vma, addr, ptent);
 224                 if (!page)
 225                         continue;
 226
 227                 if (page_mapcount(page) >= 2) {
 228                         if (pte_dirty(ptent))
 229                                 mss->shared_dirty += PAGE_SIZE;
 230                         else
 231                                 mss->shared_clean += PAGE_SIZE;
 232                 } else {
 233                         if (pte_dirty(ptent))
 234                                 mss->private_dirty += PAGE_SIZE;
 235                         else
 236                                 mss->private_clean += PAGE_SIZE;
 237                 }
 238         } while (pte++, addr += PAGE_SIZE, addr != end);
 239         pte_unmap_unlock(pte - 1, ptl);
 240         cond_resched();
 241 }
 242
 243 static inline void smaps_pmd_range(struct vm_area_struct *vma, pud_t *pud,
 244                                 unsigned long addr, unsigned long end,
 245                                 struct mem_size_stats *mss)
 246 {
 247         pmd_t *pmd;
 248         unsigned long next;
 249
 250         pmd = pmd_offset(pud, addr);
 251         do {
 252                 next = pmd_addr_end(addr, end);
 253                 if (pmd_none_or_clear_bad(pmd))
 254                         continue;
 255                 smaps_pte_range(vma, pmd, addr, next, mss);
 256         } while (pmd++, addr = next, addr != end);
 257 }
 258
 259 static inline void smaps_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
 260                                 unsigned long addr, unsigned long end,
 261                                 struct mem_size_stats *mss)
 262 {
 263         pud_t *pud;
 264         unsigned long next;
 265
 266         pud = pud_offset(pgd, addr);
 267         do {
 268                 next = pud_addr_end(addr, end);
 269                 if (pud_none_or_clear_bad(pud))
 270                         continue;
 271                 smaps_pmd_range(vma, pud, addr, next, mss);
 272         } while (pud++, addr = next, addr != end);
 273 }
 274
 275 static inline void smaps_pgd_range(struct vm_area_struct *vma,
 276                                 unsigned long addr, unsigned long end,
 277                                 struct mem_size_stats *mss)
 278 {
 279         pgd_t *pgd;
 280         unsigned long next;
 281
 282         pgd = pgd_offset(vma->vm_mm, addr);
 283         do {
 284                 next = pgd_addr_end(addr, end);
 285                 if (pgd_none_or_clear_bad(pgd))
 286                         continue;
 287                 smaps_pud_range(vma, pgd, addr, next, mss);
 288         } while (pgd++, addr = next, addr != end);
 289 }
 290
 291 static int show_smap(struct seq_file *m, void *v)
 292 {
 293         struct vm_area_struct *vma = v;
 294         struct mem_size_stats mss;
 295
 296         memset(&mss, 0, sizeof mss);
 297         if (vma->vm_mm && !is_vm_hugetlb_page(vma))
 298                 smaps_pgd_range(vma, vma->vm_start, vma->vm_end, &mss);
 299         return show_map_internal(m, v, &mss);
 300 }
 301
 302 static void *m_start(struct seq_file *m, loff_t *pos)
 303 {
 304         struct proc_maps_private *priv = m->private;
 305         unsigned long last_addr = m->version;
 306         struct mm_struct *mm;
 307         struct vm_area_struct *vma, *tail_vma = NULL;
 308         loff_t l = *pos;
 309
 310         /* Clear the per syscall fields in priv */
 311         priv->task = NULL;
 312         priv->tail_vma = NULL;
 313
 314         /*
 315          * We remember last_addr rather than next_addr to hit with
 316          * mmap_cache most of the time. We have zero last_addr at
 317          * the beginning and also after lseek. We will have -1 last_addr
 318          * after the end of the vmas.
 319          */
 320
 321         if (last_addr == -1UL)
 322                 return NULL;
 323
 324         priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
 325         if (!priv->task)
 326                 return NULL;
 327
 328         mm = get_task_mm(priv->task);
 329         if (!mm)
 330                 return NULL;
 331
 332         priv->tail_vma = tail_vma = get_gate_vma(priv->task);
 333         down_read(&mm->mmap_sem);
 334
 335         /* Start with last addr hint */
 336         if (last_addr && (vma = find_vma(mm, last_addr))) {
 337                 vma = vma->vm_next;
 338                 goto out;
 339         }
 340
 341         /*
 342          * Check the vma index is within the range and do
 343          * sequential scan until m_index.
 344          */
 345         vma = NULL;
 346         if ((unsigned long)l < mm->map_count) {
 347                 vma = mm->mmap;
 348                 while (l-- && vma)
 349                         vma = vma->vm_next;
 350                 goto out;
 351         }
 352
 353         if (l != mm->map_count)
 354                 tail_vma = NULL; /* After gate vma */
 355
 356 out:
 357         if (vma)
 358                 return vma;
 359
 360         /* End of vmas has been reached */
 361         m->version = (tail_vma != NULL)? 0: -1UL;
 362         up_read(&mm->mmap_sem);
 363         mmput(mm);
 364         return tail_vma;
 365 }
 366
 367 static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma)
 368 {
 369         if (vma && vma != priv->tail_vma) {
 370                 struct mm_struct *mm = vma->vm_mm;
 371                 up_read(&mm->mmap_sem);
 372                 mmput(mm);
 373         }
 374 }
 375
 376 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 377 {
 378         struct proc_maps_private *priv = m->private;
 379         struct vm_area_struct *vma = v;
 380         struct vm_area_struct *tail_vma = priv->tail_vma;
 381
 382         (*pos)++;
 383         if (vma && (vma != tail_vma) && vma->vm_next)
 384                 return vma->vm_next;
 385         vma_stop(priv, vma);
 386         return (vma != tail_vma)? tail_vma: NULL;
 387 }
 388
 389 static void m_stop(struct seq_file *m, void *v)
 390 {
 391         struct proc_maps_private *priv = m->private;
 392         struct vm_area_struct *vma = v;
 393
 394         vma_stop(priv, vma);
 395         if (priv->task)
 396                 put_task_struct(priv->task);
 397 }
 398
 399 static struct seq_operations proc_pid_maps_op = {
 400         .start  = m_start,
 401         .next   = m_next,
 402         .stop   = m_stop,
 403         .show   = show_map
 404 };
 405
 406 static struct seq_operations proc_pid_smaps_op = {
 407         .start  = m_start,
 408         .next   = m_next,
 409         .stop   = m_stop,
 410         .show   = show_smap
 411 };
 412
 413 static int do_maps_open(struct inode *inode, struct file *file,
 414                         struct seq_operations *ops)
 415 {
 416         struct proc_maps_private *priv;
 417         int ret = -ENOMEM;
 418         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 419         if (priv) {
 420                 priv->pid = proc_pid(inode);
 421                 ret = seq_open(file, ops);
 422                 if (!ret) {
 423                         struct seq_file *m = file->private_data;
 424                         m->private = priv;
 425                 } else {
 426                         kfree(priv);
 427                 }
 428         }
 429         return ret;
 430 }
 431
 432 static int maps_open(struct inode *inode, struct file *file)
 433 {
 434         return do_maps_open(inode, file, &proc_pid_maps_op);
 435 }
 436
 437 const struct file_operations proc_maps_operations = {
 438         .open           = maps_open,
 439         .read           = seq_read,
 440         .llseek         = seq_lseek,
 441         .release        = seq_release_private,
 442 };
 443
 444 #ifdef CONFIG_NUMA
 445 extern int show_numa_map(struct seq_file *m, void *v);
 446
 447 static struct seq_operations proc_pid_numa_maps_op = {
 448         .start  = m_start,
 449         .next   = m_next,
 450         .stop   = m_stop,
 451         .show   = show_numa_map
 452 };
 453
 454 static int numa_maps_open(struct inode *inode, struct file *file)
 455 {
 456         return do_maps_open(inode, file, &proc_pid_numa_maps_op);
 457 }
 458
 459 const struct file_operations proc_numa_maps_operations = {
 460         .open           = numa_maps_open,
 461         .read           = seq_read,
 462         .llseek         = seq_lseek,
 463         .release        = seq_release_private,
 464 };
 465 #endif
 466
 467 static int smaps_open(struct inode *inode, struct file *file)
 468 {
 469         return do_maps_open(inode, file, &proc_pid_smaps_op);
 470 }
 471
 472 const struct file_operations proc_smaps_operations = {
 473         .open           = smaps_open,
 474         .read           = seq_read,
 475         .llseek         = seq_lseek,
 476         .release        = seq_release_private,
 477 };