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