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 = proc_task(inode);
  79         struct mm_struct * mm = get_task_mm(task);
  80
  81         if (!mm)
  82                 goto out;
  83         down_read(&mm->mmap_sem);
  84
  85         vma = mm->mmap;
  86         while (vma) {
  87                 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file)
  88                         break;
  89                 vma = vma->vm_next;
  90         }
  91
  92         if (vma) {
  93                 *mnt = mntget(vma->vm_file->f_vfsmnt);
  94                 *dentry = dget(vma->vm_file->f_dentry);
  95                 result = 0;
  96         }
  97
  98         up_read(&mm->mmap_sem);
  99         mmput(mm);
 100 out:
 101         return result;
 102 }
 103
 104 static void pad_len_spaces(struct seq_file *m, int len)
 105 {
 106         len = 25 + sizeof(void*) * 6 - len;
 107         if (len < 1)
 108                 len = 1;
 109         seq_printf(m, "%*c", len, ' ');
 110 }
 111
 112 struct mem_size_stats
 113 {
 114         unsigned long resident;
 115         unsigned long shared_clean;
 116         unsigned long shared_dirty;
 117         unsigned long private_clean;
 118         unsigned long private_dirty;
 119 };
 120
 121 static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
 122 {
 123         struct task_struct *task = m->private;
 124         struct vm_area_struct *vma = v;
 125         struct mm_struct *mm = vma->vm_mm;
 126         struct file *file = vma->vm_file;
 127         int flags = vma->vm_flags;
 128         unsigned long ino = 0;
 129         dev_t dev = 0;
 130         int len;
 131
 132         if (file) {
 133                 struct inode *inode = vma->vm_file->f_dentry->d_inode;
 134                 dev = inode->i_sb->s_dev;
 135                 ino = inode->i_ino;
 136         }
 137
 138         seq_printf(m, "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
 139                         vma->vm_start,
 140                         vma->vm_end,
 141                         flags & VM_READ ? 'r' : '-',
 142                         flags & VM_WRITE ? 'w' : '-',
 143                         flags & VM_EXEC ? 'x' : '-',
 144                         flags & VM_MAYSHARE ? 's' : 'p',
 145                         vma->vm_pgoff << PAGE_SHIFT,
 146                         MAJOR(dev), MINOR(dev), ino, &len);
 147
 148         /*
 149          * Print the dentry name for named mappings, and a
 150          * special [heap] marker for the heap:
 151          */
 152         if (file) {
 153                 pad_len_spaces(m, len);
 154                 seq_path(m, file->f_vfsmnt, file->f_dentry, "\n");
 155         } else {
 156                 if (mm) {
 157                         if (vma->vm_start <= mm->start_brk &&
 158                                                 vma->vm_end >= mm->brk) {
 159                                 pad_len_spaces(m, len);
 160                                 seq_puts(m, "[heap]");
 161                         } else {
 162                                 if (vma->vm_start <= mm->start_stack &&
 163                                         vma->vm_end >= mm->start_stack) {
 164
 165                                         pad_len_spaces(m, len);
 166                                         seq_puts(m, "[stack]");
 167                                 }
 168                         }
 169                 } else {
 170                         pad_len_spaces(m, len);
 171                         seq_puts(m, "[vdso]");
 172                 }
 173         }
 174         seq_putc(m, '\n');
 175
 176         if (mss)
 177                 seq_printf(m,
 178                            "Size:          %8lu kB\n"
 179                            "Rss:           %8lu kB\n"
 180                            "Shared_Clean:  %8lu kB\n"
 181                            "Shared_Dirty:  %8lu kB\n"
 182                            "Private_Clean: %8lu kB\n"
 183                            "Private_Dirty: %8lu kB\n",
 184                            (vma->vm_end - vma->vm_start) >> 10,
 185                            mss->resident >> 10,
 186                            mss->shared_clean  >> 10,
 187                            mss->shared_dirty  >> 10,
 188                            mss->private_clean >> 10,
 189                            mss->private_dirty >> 10);
 190
 191         if (m->count < m->size)  /* vma is copied successfully */
 192                 m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
 193         return 0;
 194 }
 195
 196 static int show_map(struct seq_file *m, void *v)
 197 {
 198         return show_map_internal(m, v, NULL);
 199 }
 200
 201 static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 202                                 unsigned long addr, unsigned long end,
 203                                 struct mem_size_stats *mss)
 204 {
 205         pte_t *pte, ptent;
 206         spinlock_t *ptl;
 207         unsigned long pfn;
 208         struct page *page;
 209
 210         pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
 211         do {
 212                 ptent = *pte;
 213                 if (!pte_present(ptent))
 214                         continue;
 215
 216                 mss->resident += PAGE_SIZE;
 217                 pfn = pte_pfn(ptent);
 218                 if (!pfn_valid(pfn))
 219                         continue;
 220
 221                 page = pfn_to_page(pfn);
 222                 if (page_count(page) >= 2) {
 223                         if (pte_dirty(ptent))
 224                                 mss->shared_dirty += PAGE_SIZE;
 225                         else
 226                                 mss->shared_clean += PAGE_SIZE;
 227                 } else {
 228                         if (pte_dirty(ptent))
 229                                 mss->private_dirty += PAGE_SIZE;
 230                         else
 231                                 mss->private_clean += PAGE_SIZE;
 232                 }
 233         } while (pte++, addr += PAGE_SIZE, addr != end);
 234         pte_unmap_unlock(pte - 1, ptl);
 235         cond_resched();
 236 }
 237
 238 static inline void smaps_pmd_range(struct vm_area_struct *vma, pud_t *pud,
 239                                 unsigned long addr, unsigned long end,
 240                                 struct mem_size_stats *mss)
 241 {
 242         pmd_t *pmd;
 243         unsigned long next;
 244
 245         pmd = pmd_offset(pud, addr);
 246         do {
 247                 next = pmd_addr_end(addr, end);
 248                 if (pmd_none_or_clear_bad(pmd))
 249                         continue;
 250                 smaps_pte_range(vma, pmd, addr, next, mss);
 251         } while (pmd++, addr = next, addr != end);
 252 }
 253
 254 static inline void smaps_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
 255                                 unsigned long addr, unsigned long end,
 256                                 struct mem_size_stats *mss)
 257 {
 258         pud_t *pud;
 259         unsigned long next;
 260
 261         pud = pud_offset(pgd, addr);
 262         do {
 263                 next = pud_addr_end(addr, end);
 264                 if (pud_none_or_clear_bad(pud))
 265                         continue;
 266                 smaps_pmd_range(vma, pud, addr, next, mss);
 267         } while (pud++, addr = next, addr != end);
 268 }
 269
 270 static inline void smaps_pgd_range(struct vm_area_struct *vma,
 271                                 unsigned long addr, unsigned long end,
 272                                 struct mem_size_stats *mss)
 273 {
 274         pgd_t *pgd;
 275         unsigned long next;
 276
 277         pgd = pgd_offset(vma->vm_mm, addr);
 278         do {
 279                 next = pgd_addr_end(addr, end);
 280                 if (pgd_none_or_clear_bad(pgd))
 281                         continue;
 282                 smaps_pud_range(vma, pgd, addr, next, mss);
 283         } while (pgd++, addr = next, addr != end);
 284 }
 285
 286 static int show_smap(struct seq_file *m, void *v)
 287 {
 288         struct vm_area_struct *vma = v;
 289         struct mem_size_stats mss;
 290
 291         memset(&mss, 0, sizeof mss);
 292         if (vma->vm_mm)
 293                 smaps_pgd_range(vma, vma->vm_start, vma->vm_end, &mss);
 294         return show_map_internal(m, v, &mss);
 295 }
 296
 297 static void *m_start(struct seq_file *m, loff_t *pos)
 298 {
 299         struct task_struct *task = m->private;
 300         unsigned long last_addr = m->version;
 301         struct mm_struct *mm;
 302         struct vm_area_struct *vma, *tail_vma;
 303         loff_t l = *pos;
 304
 305         /*
 306          * We remember last_addr rather than next_addr to hit with
 307          * mmap_cache most of the time. We have zero last_addr at
 308          * the beginning and also after lseek. We will have -1 last_addr
 309          * after the end of the vmas.
 310          */
 311
 312         if (last_addr == -1UL)
 313                 return NULL;
 314
 315         mm = get_task_mm(task);
 316         if (!mm)
 317                 return NULL;
 318
 319         tail_vma = get_gate_vma(task);
 320         down_read(&mm->mmap_sem);
 321
 322         /* Start with last addr hint */
 323         if (last_addr && (vma = find_vma(mm, last_addr))) {
 324                 vma = vma->vm_next;
 325                 goto out;
 326         }
 327
 328         /*
 329          * Check the vma index is within the range and do
 330          * sequential scan until m_index.
 331          */
 332         vma = NULL;
 333         if ((unsigned long)l < mm->map_count) {
 334                 vma = mm->mmap;
 335                 while (l-- && vma)
 336                         vma = vma->vm_next;
 337                 goto out;
 338         }
 339
 340         if (l != mm->map_count)
 341                 tail_vma = NULL; /* After gate vma */
 342
 343 out:
 344         if (vma)
 345                 return vma;
 346
 347         /* End of vmas has been reached */
 348         m->version = (tail_vma != NULL)? 0: -1UL;
 349         up_read(&mm->mmap_sem);
 350         mmput(mm);
 351         return tail_vma;
 352 }
 353
 354 static void m_stop(struct seq_file *m, void *v)
 355 {
 356         struct task_struct *task = m->private;
 357         struct vm_area_struct *vma = v;
 358         if (vma && vma != get_gate_vma(task)) {
 359                 struct mm_struct *mm = vma->vm_mm;
 360                 up_read(&mm->mmap_sem);
 361                 mmput(mm);
 362         }
 363 }
 364
 365 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 366 {
 367         struct task_struct *task = m->private;
 368         struct vm_area_struct *vma = v;
 369         struct vm_area_struct *tail_vma = get_gate_vma(task);
 370
 371         (*pos)++;
 372         if (vma && (vma != tail_vma) && vma->vm_next)
 373                 return vma->vm_next;
 374         m_stop(m, v);
 375         return (vma != tail_vma)? tail_vma: NULL;
 376 }
 377
 378 struct seq_operations proc_pid_maps_op = {
 379         .start  = m_start,
 380         .next   = m_next,
 381         .stop   = m_stop,
 382         .show   = show_map
 383 };
 384
 385 struct seq_operations proc_pid_smaps_op = {
 386         .start  = m_start,
 387         .next   = m_next,
 388         .stop   = m_stop,
 389         .show   = show_smap
 390 };
 391
 392 #ifdef CONFIG_NUMA
 393 extern int show_numa_map(struct seq_file *m, void *v);
 394
 395 struct seq_operations proc_pid_numa_maps_op = {
 396         .start  = m_start,
 397         .next   = m_next,
 398         .stop   = m_stop,
 399         .show   = show_numa_map
 400 };
 401 #endif