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
  18         data = mm->total_vm - mm->shared_vm - mm->stack_vm;
  19         text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
  20         lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
  21         buffer += sprintf(buffer,
  22                 "VmSize:\t%8lu kB\n"
  23                 "VmLck:\t%8lu kB\n"
  24                 "VmRSS:\t%8lu kB\n"
  25                 "VmData:\t%8lu kB\n"
  26                 "VmStk:\t%8lu kB\n"
  27                 "VmExe:\t%8lu kB\n"
  28                 "VmLib:\t%8lu kB\n"
  29                 "VmPTE:\t%8lu kB\n",
  30                 (mm->total_vm - mm->reserved_vm) << (PAGE_SHIFT-10),
  31                 mm->locked_vm << (PAGE_SHIFT-10),
  32                 get_mm_counter(mm, rss) << (PAGE_SHIFT-10),
  33                 data << (PAGE_SHIFT-10),
  34                 mm->stack_vm << (PAGE_SHIFT-10), text, lib,
  35                 (PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10);
  36         return buffer;
  37 }
  38
  39 unsigned long task_vsize(struct mm_struct *mm)
  40 {
  41         return PAGE_SIZE * mm->total_vm;
  42 }
  43
  44 int task_statm(struct mm_struct *mm, int *shared, int *text,
  45                int *data, int *resident)
  46 {
  47         int rss = get_mm_counter(mm, rss);
  48
  49         *shared = rss - get_mm_counter(mm, anon_rss);
  50         *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
  51                                                                 >> PAGE_SHIFT;
  52         *data = mm->total_vm - mm->shared_vm;
  53         *resident = rss;
  54         return mm->total_vm;
  55 }
  56
  57 int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
  58 {
  59         struct vm_area_struct * vma;
  60         int result = -ENOENT;
  61         struct task_struct *task = proc_task(inode);
  62         struct mm_struct * mm = get_task_mm(task);
  63
  64         if (!mm)
  65                 goto out;
  66         down_read(&mm->mmap_sem);
  67
  68         vma = mm->mmap;
  69         while (vma) {
  70                 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file)
  71                         break;
  72                 vma = vma->vm_next;
  73         }
  74
  75         if (vma) {
  76                 *mnt = mntget(vma->vm_file->f_vfsmnt);
  77                 *dentry = dget(vma->vm_file->f_dentry);
  78                 result = 0;
  79         }
  80
  81         up_read(&mm->mmap_sem);
  82         mmput(mm);
  83 out:
  84         return result;
  85 }
  86
  87 static void pad_len_spaces(struct seq_file *m, int len)
  88 {
  89         len = 25 + sizeof(void*) * 6 - len;
  90         if (len < 1)
  91                 len = 1;
  92         seq_printf(m, "%*c", len, ' ');
  93 }
  94
  95 struct mem_size_stats
  96 {
  97         unsigned long resident;
  98         unsigned long shared_clean;
  99         unsigned long shared_dirty;
 100         unsigned long private_clean;
 101         unsigned long private_dirty;
 102 };
 103
 104 static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
 105 {
 106         struct task_struct *task = m->private;
 107         struct vm_area_struct *vma = v;
 108         struct mm_struct *mm = vma->vm_mm;
 109         struct file *file = vma->vm_file;
 110         int flags = vma->vm_flags;
 111         unsigned long ino = 0;
 112         dev_t dev = 0;
 113         int len;
 114
 115         if (file) {
 116                 struct inode *inode = vma->vm_file->f_dentry->d_inode;
 117                 dev = inode->i_sb->s_dev;
 118                 ino = inode->i_ino;
 119         }
 120
 121         seq_printf(m, "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
 122                         vma->vm_start,
 123                         vma->vm_end,
 124                         flags & VM_READ ? 'r' : '-',
 125                         flags & VM_WRITE ? 'w' : '-',
 126                         flags & VM_EXEC ? 'x' : '-',
 127                         flags & VM_MAYSHARE ? 's' : 'p',
 128                         vma->vm_pgoff << PAGE_SHIFT,
 129                         MAJOR(dev), MINOR(dev), ino, &len);
 130
 131         /*
 132          * Print the dentry name for named mappings, and a
 133          * special [heap] marker for the heap:
 134          */
 135         if (file) {
 136                 pad_len_spaces(m, len);
 137                 seq_path(m, file->f_vfsmnt, file->f_dentry, "\n");
 138         } else {
 139                 if (mm) {
 140                         if (vma->vm_start <= mm->start_brk &&
 141                                                 vma->vm_end >= mm->brk) {
 142                                 pad_len_spaces(m, len);
 143                                 seq_puts(m, "[heap]");
 144                         } else {
 145                                 if (vma->vm_start <= mm->start_stack &&
 146                                         vma->vm_end >= mm->start_stack) {
 147
 148                                         pad_len_spaces(m, len);
 149                                         seq_puts(m, "[stack]");
 150                                 }
 151                         }
 152                 } else {
 153                         pad_len_spaces(m, len);
 154                         seq_puts(m, "[vdso]");
 155                 }
 156         }
 157         seq_putc(m, '\n');
 158
 159         if (mss)
 160                 seq_printf(m,
 161                            "Size:          %8lu kB\n"
 162                            "Rss:           %8lu kB\n"
 163                            "Shared_Clean:  %8lu kB\n"
 164                            "Shared_Dirty:  %8lu kB\n"
 165                            "Private_Clean: %8lu kB\n"
 166                            "Private_Dirty: %8lu kB\n",
 167                            (vma->vm_end - vma->vm_start) >> 10,
 168                            mss->resident >> 10,
 169                            mss->shared_clean  >> 10,
 170                            mss->shared_dirty  >> 10,
 171                            mss->private_clean >> 10,
 172                            mss->private_dirty >> 10);
 173
 174         if (m->count < m->size)  /* vma is copied successfully */
 175                 m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
 176         return 0;
 177 }
 178
 179 static int show_map(struct seq_file *m, void *v)
 180 {
 181         return show_map_internal(m, v, 0);
 182 }
 183
 184 static void smaps_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
 185                                 unsigned long addr, unsigned long end,
 186                                 struct mem_size_stats *mss)
 187 {
 188         pte_t *pte, ptent;
 189         unsigned long pfn;
 190         struct page *page;
 191
 192         pte = pte_offset_map(pmd, addr);
 193         do {
 194                 ptent = *pte;
 195                 if (pte_none(ptent) || !pte_present(ptent))
 196                         continue;
 197
 198                 mss->resident += PAGE_SIZE;
 199                 pfn = pte_pfn(ptent);
 200                 if (!pfn_valid(pfn))
 201                         continue;
 202
 203                 page = pfn_to_page(pfn);
 204                 if (page_count(page) >= 2) {
 205                         if (pte_dirty(ptent))
 206                                 mss->shared_dirty += PAGE_SIZE;
 207                         else
 208                                 mss->shared_clean += PAGE_SIZE;
 209                 } else {
 210                         if (pte_dirty(ptent))
 211                                 mss->private_dirty += PAGE_SIZE;
 212                         else
 213                                 mss->private_clean += PAGE_SIZE;
 214                 }
 215         } while (pte++, addr += PAGE_SIZE, addr != end);
 216         pte_unmap(pte - 1);
 217         cond_resched_lock(&vma->vm_mm->page_table_lock);
 218 }
 219
 220 static inline void smaps_pmd_range(struct vm_area_struct *vma, pud_t *pud,
 221                                 unsigned long addr, unsigned long end,
 222                                 struct mem_size_stats *mss)
 223 {
 224         pmd_t *pmd;
 225         unsigned long next;
 226
 227         pmd = pmd_offset(pud, addr);
 228         do {
 229                 next = pmd_addr_end(addr, end);
 230                 if (pmd_none_or_clear_bad(pmd))
 231                         continue;
 232                 smaps_pte_range(vma, pmd, addr, next, mss);
 233         } while (pmd++, addr = next, addr != end);
 234 }
 235
 236 static inline void smaps_pud_range(struct vm_area_struct *vma, pgd_t *pgd,
 237                                 unsigned long addr, unsigned long end,
 238                                 struct mem_size_stats *mss)
 239 {
 240         pud_t *pud;
 241         unsigned long next;
 242
 243         pud = pud_offset(pgd, addr);
 244         do {
 245                 next = pud_addr_end(addr, end);
 246                 if (pud_none_or_clear_bad(pud))
 247                         continue;
 248                 smaps_pmd_range(vma, pud, addr, next, mss);
 249         } while (pud++, addr = next, addr != end);
 250 }
 251
 252 static inline void smaps_pgd_range(struct vm_area_struct *vma,
 253                                 unsigned long addr, unsigned long end,
 254                                 struct mem_size_stats *mss)
 255 {
 256         pgd_t *pgd;
 257         unsigned long next;
 258
 259         pgd = pgd_offset(vma->vm_mm, addr);
 260         do {
 261                 next = pgd_addr_end(addr, end);
 262                 if (pgd_none_or_clear_bad(pgd))
 263                         continue;
 264                 smaps_pud_range(vma, pgd, addr, next, mss);
 265         } while (pgd++, addr = next, addr != end);
 266 }
 267
 268 static int show_smap(struct seq_file *m, void *v)
 269 {
 270         struct vm_area_struct *vma = v;
 271         struct mm_struct *mm = vma->vm_mm;
 272         struct mem_size_stats mss;
 273
 274         memset(&mss, 0, sizeof mss);
 275
 276         if (mm) {
 277                 spin_lock(&mm->page_table_lock);
 278                 smaps_pgd_range(vma, vma->vm_start, vma->vm_end, &mss);
 279                 spin_unlock(&mm->page_table_lock);
 280         }
 281
 282         return show_map_internal(m, v, &mss);
 283 }
 284
 285 static void *m_start(struct seq_file *m, loff_t *pos)
 286 {
 287         struct task_struct *task = m->private;
 288         unsigned long last_addr = m->version;
 289         struct mm_struct *mm;
 290         struct vm_area_struct *vma, *tail_vma;
 291         loff_t l = *pos;
 292
 293         /*
 294          * We remember last_addr rather than next_addr to hit with
 295          * mmap_cache most of the time. We have zero last_addr at
 296          * the beginning and also after lseek. We will have -1 last_addr
 297          * after the end of the vmas.
 298          */
 299
 300         if (last_addr == -1UL)
 301                 return NULL;
 302
 303         mm = get_task_mm(task);
 304         if (!mm)
 305                 return NULL;
 306
 307         tail_vma = get_gate_vma(task);
 308         down_read(&mm->mmap_sem);
 309
 310         /* Start with last addr hint */
 311         if (last_addr && (vma = find_vma(mm, last_addr))) {
 312                 vma = vma->vm_next;
 313                 goto out;
 314         }
 315
 316         /*
 317          * Check the vma index is within the range and do
 318          * sequential scan until m_index.
 319          */
 320         vma = NULL;
 321         if ((unsigned long)l < mm->map_count) {
 322                 vma = mm->mmap;
 323                 while (l-- && vma)
 324                         vma = vma->vm_next;
 325                 goto out;
 326         }
 327
 328         if (l != mm->map_count)
 329                 tail_vma = NULL; /* After gate vma */
 330
 331 out:
 332         if (vma)
 333                 return vma;
 334
 335         /* End of vmas has been reached */
 336         m->version = (tail_vma != NULL)? 0: -1UL;
 337         up_read(&mm->mmap_sem);
 338         mmput(mm);
 339         return tail_vma;
 340 }
 341
 342 static void m_stop(struct seq_file *m, void *v)
 343 {
 344         struct task_struct *task = m->private;
 345         struct vm_area_struct *vma = v;
 346         if (vma && vma != get_gate_vma(task)) {
 347                 struct mm_struct *mm = vma->vm_mm;
 348                 up_read(&mm->mmap_sem);
 349                 mmput(mm);
 350         }
 351 }
 352
 353 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 354 {
 355         struct task_struct *task = m->private;
 356         struct vm_area_struct *vma = v;
 357         struct vm_area_struct *tail_vma = get_gate_vma(task);
 358
 359         (*pos)++;
 360         if (vma && (vma != tail_vma) && vma->vm_next)
 361                 return vma->vm_next;
 362         m_stop(m, v);
 363         return (vma != tail_vma)? tail_vma: NULL;
 364 }
 365
 366 struct seq_operations proc_pid_maps_op = {
 367         .start  = m_start,
 368         .next   = m_next,
 369         .stop   = m_stop,
 370         .show   = show_map
 371 };
 372
 373 struct seq_operations proc_pid_smaps_op = {
 374         .start  = m_start,
 375         .next   = m_next,
 376         .stop   = m_stop,
 377         .show   = show_smap
 378 };
 379
 380 #ifdef CONFIG_NUMA
 381
 382 struct numa_maps {
 383         unsigned long pages;
 384         unsigned long anon;
 385         unsigned long mapped;
 386         unsigned long mapcount_max;
 387         unsigned long node[MAX_NUMNODES];
 388 };
 389
 390 /*
 391  * Calculate numa node maps for a vma
 392  */
 393 static struct numa_maps *get_numa_maps(const struct vm_area_struct *vma)
 394 {
 395         struct page *page;
 396         unsigned long vaddr;
 397         struct mm_struct *mm = vma->vm_mm;
 398         int i;
 399         struct numa_maps *md = kmalloc(sizeof(struct numa_maps), GFP_KERNEL);
 400
 401         if (!md)
 402                 return NULL;
 403         md->pages = 0;
 404         md->anon = 0;
 405         md->mapped = 0;
 406         md->mapcount_max = 0;
 407         for_each_node(i)
 408                 md->node[i] =0;
 409
 410         spin_lock(&mm->page_table_lock);
 411         for (vaddr = vma->vm_start; vaddr < vma->vm_end; vaddr += PAGE_SIZE) {
 412                 page = follow_page(mm, vaddr, 0);
 413                 if (page) {
 414                         int count = page_mapcount(page);
 415
 416                         if (count)
 417                                 md->mapped++;
 418                         if (count > md->mapcount_max)
 419                                 md->mapcount_max = count;
 420                         md->pages++;
 421                         if (PageAnon(page))
 422                                 md->anon++;
 423                         md->node[page_to_nid(page)]++;
 424                 }
 425         }
 426         spin_unlock(&mm->page_table_lock);
 427         return md;
 428 }
 429
 430 static int show_numa_map(struct seq_file *m, void *v)
 431 {
 432         struct task_struct *task = m->private;
 433         struct vm_area_struct *vma = v;
 434         struct mempolicy *pol;
 435         struct numa_maps *md;
 436         struct zone **z;
 437         int n;
 438         int first;
 439
 440         if (!vma->vm_mm)
 441                 return 0;
 442
 443         md = get_numa_maps(vma);
 444         if (!md)
 445                 return 0;
 446
 447         seq_printf(m, "%08lx", vma->vm_start);
 448         pol = get_vma_policy(task, vma, vma->vm_start);
 449         /* Print policy */
 450         switch (pol->policy) {
 451         case MPOL_PREFERRED:
 452                 seq_printf(m, " prefer=%d", pol->v.preferred_node);
 453                 break;
 454         case MPOL_BIND:
 455                 seq_printf(m, " bind={");
 456                 first = 1;
 457                 for (z = pol->v.zonelist->zones; *z; z++) {
 458
 459                         if (!first)
 460                                 seq_putc(m, ',');
 461                         else
 462                                 first = 0;
 463                         seq_printf(m, "%d/%s", (*z)->zone_pgdat->node_id,
 464                                         (*z)->name);
 465                 }
 466                 seq_putc(m, '}');
 467                 break;
 468         case MPOL_INTERLEAVE:
 469                 seq_printf(m, " interleave={");
 470                 first = 1;
 471                 for_each_node(n) {
 472                         if (test_bit(n, pol->v.nodes)) {
 473                                 if (!first)
 474                                         seq_putc(m,',');
 475                                 else
 476                                         first = 0;
 477                                 seq_printf(m, "%d",n);
 478                         }
 479                 }
 480                 seq_putc(m, '}');
 481                 break;
 482         default:
 483                 seq_printf(m," default");
 484                 break;
 485         }
 486         seq_printf(m, " MaxRef=%lu Pages=%lu Mapped=%lu",
 487                         md->mapcount_max, md->pages, md->mapped);
 488         if (md->anon)
 489                 seq_printf(m," Anon=%lu",md->anon);
 490
 491         for_each_online_node(n) {
 492                 if (md->node[n])
 493                         seq_printf(m, " N%d=%lu", n, md->node[n]);
 494         }
 495         seq_putc(m, '\n');
 496         kfree(md);
 497         if (m->count < m->size)  /* vma is copied successfully */
 498                 m->version = (vma != get_gate_vma(task)) ? vma->vm_start : 0;
 499         return 0;
 500 }
 501
 502 struct seq_operations proc_pid_numa_maps_op = {
 503         .start  = m_start,
 504         .next   = m_next,
 505         .stop   = m_stop,
 506         .show   = show_numa_map
 507 };
 508 #endif