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                 "StaBrk:\t%08lx kB\n"
  48                 "Brk:\t%08lx kB\n"
  49                 "StaStk:\t%08lx kB\n"
  50                 ,
  51                 hiwater_vm << (PAGE_SHIFT-10),
  52                 (total_vm - mm->reserved_vm) << (PAGE_SHIFT-10),
  53                 mm->locked_vm << (PAGE_SHIFT-10),
  54                 hiwater_rss << (PAGE_SHIFT-10),
  55                 total_rss << (PAGE_SHIFT-10),
  56                 data << (PAGE_SHIFT-10),
  57                 mm->stack_vm << (PAGE_SHIFT-10), text, lib,
  58                 (PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10,
  59                 mm->start_brk, mm->brk, mm->start_stack);
  60 #ifdef __i386__
  61         if (!nx_enabled)
  62                 buffer += sprintf(buffer,
  63                         "ExecLim:\t%08lx\n", mm->context.exec_limit);
  64 #endif
  65         return buffer;
  66 }
  67
  68 unsigned long task_vsize(struct mm_struct *mm)
  69 {
  70         return PAGE_SIZE * mm->total_vm;
  71 }
  72
  73 int task_statm(struct mm_struct *mm, int *shared, int *text,
  74                int *data, int *resident)
  75 {
  76         *shared = get_mm_counter(mm, file_rss);
  77         *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
  78                                                                 >> PAGE_SHIFT;
  79         *data = mm->total_vm - mm->shared_vm;
  80         *resident = *shared + get_mm_counter(mm, anon_rss);
  81         return mm->total_vm;
  82 }
  83
  84 int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
  85 {
  86         struct vm_area_struct * vma;
  87         int result = -ENOENT;
  88         struct task_struct *task = proc_task(inode);
  89         struct mm_struct * mm = get_task_mm(task);
  90
  91         if (!mm)
  92                 goto out;
  93         down_read(&mm->mmap_sem);
  94
  95         vma = mm->mmap;
  96         while (vma) {
  97                 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file)
  98                         break;
  99                 vma = vma->vm_next;
 100         }
 101
 102         if (vma) {
 103                 *mnt = mntget(vma->vm_file->f_vfsmnt);
 104                 *dentry = dget(vma->vm_file->f_dentry);
 105                 result = 0;
 106         }
 107
 108         up_read(&mm->mmap_sem);
 109         mmput(mm);
 110 out:
 111         return result;
 112 }
 113
 114 static void pad_len_spaces(struct seq_file *m, int len)
 115 {
 116         len = 25 + sizeof(void*) * 6 - len;
 117         if (len < 1)
 118                 len = 1;
 119         seq_printf(m, "%*c", len, ' ');
 120 }
 121
 122 struct mem_size_stats
 123 {
 124         unsigned long resident;
 125         unsigned long shared_clean;
 126         unsigned long shared_dirty;
 127         unsigned long private_clean;
 128         unsigned long private_dirty;
 129 };
 130
 131 static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
 132 {
 133         struct task_struct *task = m->private;
 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
 154 #ifdef __i386__
 155                                 || (!nx_enabled &&
 156                                 (vma->vm_start < task->mm->context.exec_limit))
 157 #endif
 158                         )
 159                                 ? 'x' : '-',
 160                         flags & VM_MAYSHARE ? 's' : 'p',
 161                         vma->vm_pgoff << PAGE_SHIFT,
 162                         MAJOR(dev), MINOR(dev), ino, &len);
 163
 164         /*
 165          * Print the dentry name for named mappings, and a
 166          * special [heap] marker for the heap:
 167          */
 168         if (file) {
 169                 pad_len_spaces(m, len);
 170                 seq_path(m, file->f_vfsmnt, file->f_dentry, "\n");
 171         } else {
 172                 if (mm) {
 173                         if (vma->vm_end == mm->brk) {
 174                                 pad_len_spaces(m, len);
 175                                 seq_puts(m, "[heap]");
 176                         } else if (vma->vm_start <= mm->start_stack &&
 177                                         vma->vm_end >= mm->start_stack) {
 178
 179                                         pad_len_spaces(m, len);
 180                                         seq_puts(m, "[stack]");
 181                                 }
 182 #ifdef __i386__
 183                         else if (vma->vm_start ==
 184                                 (unsigned long)mm->context.vdso) {
 185                                 pad_len_spaces(m, len);
 186                                 seq_puts(m, "[vdso]");
 187                         }
 188 #endif
 189                 } else {
 190                         pad_len_spaces(m, len);
 191                         seq_puts(m, "[vdso]");
 192                 }
 193         }
 194         seq_putc(m, '\n');
 195
 196         if (mss)
 197                 seq_printf(m,
 198                            "Size:          %8lu kB\n"
 199                            "Rss:           %8lu kB\n"
 200                            "Shared_Clean:  %8lu kB\n"
 201                            "Shared_Dirty:  %8lu kB\n"
 202                            "Private_Clean: %8lu kB\n"
 203                            "Private_Dirty: %8lu kB\n",
 204                            (vma->vm_end - vma->vm_start) >> 10,
 205                            mss->resident >> 10,
 206                            mss->shared_clean  >> 10,
 207                            mss->shared_dirty  >> 10,
 208                            mss->private_clean >> 10,
 209                            mss->private_dirty >> 10);
 210
 211         if (m->count < m->size)  /* vma is copied successfully */
 212                 m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
 213         return 0;
 214 }
 215
 216 static int show_map(struct seq_file *m, void *v)
 217 {
 218         return show_map_internal(m, v, NULL);
 219 }
 220
 221 static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 222                                 unsigned long addr, unsigned long end,
 223                                 struct mem_size_stats *mss)
 224 {
 225         pte_t *pte, ptent;
 226         spinlock_t *ptl;
 227         struct page *page;
 228
 229         pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
 230         do {
 231                 ptent = *pte;
 232                 if (!pte_present(ptent))
 233                         continue;
 234
 235                 mss->resident += PAGE_SIZE;
 236
 237                 page = vm_normal_page(vma, addr, ptent);
 238                 if (!page)
 239                         continue;
 240
 241                 if (page_mapcount(page) >= 2) {
 242                         if (pte_dirty(ptent))
 243                                 mss->shared_dirty += PAGE_SIZE;
 244                         else
 245                                 mss->shared_clean += PAGE_SIZE;
 246                 } else {
 247                         if (pte_dirty(ptent))
 248                                 mss->private_dirty += PAGE_SIZE;
 249                         else
 250                                 mss->private_clean += PAGE_SIZE;
 251                 }
 252         } while (pte++, addr += PAGE_SIZE, addr != end);
 253         pte_unmap_unlock(pte - 1, ptl);
 254         cond_resched();
 255 }
 256
 257 static inline void smaps_pmd_range(struct vm_area_struct *vma, pud_t *pud,
 258                                 unsigned long addr, unsigned long end,
 259                                 struct mem_size_stats *mss)
 260 {
 261         pmd_t *pmd;
 262         unsigned long next;
 263
 264         pmd = pmd_offset(pud, addr);
 265         do {
 266                 next = pmd_addr_end(addr, end);
 267                 if (pmd_none_or_clear_bad(pmd))
 268                         continue;
 269                 smaps_pte_range(vma, pmd, addr, next, mss);
 270         } while (pmd++, addr = next, addr != end);
 271 }
 272
 273 static inline void smaps_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
 274                                 unsigned long addr, unsigned long end,
 275                                 struct mem_size_stats *mss)
 276 {
 277         pud_t *pud;
 278         unsigned long next;
 279
 280         pud = pud_offset(pgd, addr);
 281         do {
 282                 next = pud_addr_end(addr, end);
 283                 if (pud_none_or_clear_bad(pud))
 284                         continue;
 285                 smaps_pmd_range(vma, pud, addr, next, mss);
 286         } while (pud++, addr = next, addr != end);
 287 }
 288
 289 static inline void smaps_pgd_range(struct vm_area_struct *vma,
 290                                 unsigned long addr, unsigned long end,
 291                                 struct mem_size_stats *mss)
 292 {
 293         pgd_t *pgd;
 294         unsigned long next;
 295
 296         pgd = pgd_offset(vma->vm_mm, addr);
 297         do {
 298                 next = pgd_addr_end(addr, end);
 299                 if (pgd_none_or_clear_bad(pgd))
 300                         continue;
 301                 smaps_pud_range(vma, pgd, addr, next, mss);
 302         } while (pgd++, addr = next, addr != end);
 303 }
 304
 305 static int show_smap(struct seq_file *m, void *v)
 306 {
 307         struct vm_area_struct *vma = v;
 308         struct mem_size_stats mss;
 309
 310         memset(&mss, 0, sizeof mss);
 311         if (vma->vm_mm && !is_vm_hugetlb_page(vma))
 312                 smaps_pgd_range(vma, vma->vm_start, vma->vm_end, &mss);
 313         return show_map_internal(m, v, &mss);
 314 }
 315
 316 static void *m_start(struct seq_file *m, loff_t *pos)
 317 {
 318         struct task_struct *task = m->private;
 319         unsigned long last_addr = m->version;
 320         struct mm_struct *mm;
 321         struct vm_area_struct *vma, *tail_vma;
 322         loff_t l = *pos;
 323
 324         /*
 325          * We remember last_addr rather than next_addr to hit with
 326          * mmap_cache most of the time. We have zero last_addr at
 327          * the beginning and also after lseek. We will have -1 last_addr
 328          * after the end of the vmas.
 329          */
 330
 331         if (last_addr == -1UL)
 332                 return NULL;
 333
 334         mm = mm_for_maps(task);
 335         if (!mm)
 336                 return NULL;
 337
 338         tail_vma = get_gate_vma(task);
 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 m_stop(struct seq_file *m, void *v)
 373 {
 374         struct task_struct *task = m->private;
 375         struct vm_area_struct *vma = v;
 376         if (vma && vma != get_gate_vma(task)) {
 377                 struct mm_struct *mm = vma->vm_mm;
 378                 up_read(&mm->mmap_sem);
 379                 mmput(mm);
 380         }
 381 }
 382
 383 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 384 {
 385         struct task_struct *task = m->private;
 386         struct vm_area_struct *vma = v;
 387         struct vm_area_struct *tail_vma = get_gate_vma(task);
 388
 389         (*pos)++;
 390         if (vma && (vma != tail_vma) && vma->vm_next)
 391                 return vma->vm_next;
 392         m_stop(m, v);
 393         return (vma != tail_vma)? tail_vma: NULL;
 394 }
 395
 396 struct seq_operations proc_pid_maps_op = {
 397         .start  = m_start,
 398         .next   = m_next,
 399         .stop   = m_stop,
 400         .show   = show_map
 401 };
 402
 403 struct seq_operations proc_pid_smaps_op = {
 404         .start  = m_start,
 405         .next   = m_next,
 406         .stop   = m_stop,
 407         .show   = show_smap
 408 };
 409
 410 #ifdef CONFIG_NUMA
 411 extern int show_numa_map(struct seq_file *m, void *v);
 412
 413 struct seq_operations proc_pid_numa_maps_op = {
 414         .start  = m_start,
 415         .next   = m_next,
 416         .stop   = m_stop,
 417         .show   = show_numa_map
 418 };
 419 #endif