fs/proc/task_mmu.c

   1 #include <linux/mm.h>
   2 #include <linux/hugetlb.h>
   3 #include <linux/seq_file.h>
   4 #include <asm/elf.h>
   5 #include <asm/uaccess.h>
   6
   7 char *task_mem(struct mm_struct *mm, char *buffer)
   8 {
   9         unsigned long data = 0, stack = 0, exec = 0, lib = 0;
  10         struct vm_area_struct *vma;
  11
  12         down_read(&mm->mmap_sem);
  13         for (vma = mm->mmap; vma; vma = vma->vm_next) {
  14                 unsigned long len = (vma->vm_end - vma->vm_start) >> 10;
  15                 if (!vma->vm_file) {
  16                         data += len;
  17                         if (vma->vm_flags & VM_GROWSDOWN)
  18                                 stack += len;
  19                         continue;
  20                 }
  21                 if (vma->vm_flags & VM_WRITE)
  22                         continue;
  23                 if (vma->vm_flags & VM_EXEC) {
  24                         exec += len;
  25                         if (vma->vm_flags & VM_EXECUTABLE)
  26                                 continue;
  27                         lib += len;
  28                 }
  29         }
  30         buffer += sprintf(buffer,
  31                 "VmSize:\t%8lu kB\n"
  32                 "VmLck:\t%8lu kB\n"
  33                 "VmRSS:\t%8lu kB\n"
  34                 "VmData:\t%8lu kB\n"
  35                 "VmStk:\t%8lu kB\n"
  36                 "VmExe:\t%8lu kB\n"
  37                 "VmLib:\t%8lu kB\n",
  38                 mm->total_vm << (PAGE_SHIFT-10),
  39                 mm->locked_vm << (PAGE_SHIFT-10),
  40                 mm->rss << (PAGE_SHIFT-10),
  41                 data - stack, stack,
  42                 exec - lib, lib);
  43         up_read(&mm->mmap_sem);
  44         return buffer;
  45 }
  46
  47 unsigned long task_vsize(struct mm_struct *mm)
  48 {
  49         return PAGE_SIZE * mm->total_vm;
  50 }
  51
  52 int task_statm(struct mm_struct *mm, int *shared, int *text,
  53                int *data, int *resident)
  54 {
  55         struct vm_area_struct *vma;
  56         int size = 0;
  57
  58         *resident = mm->rss;
  59         for (vma = mm->mmap; vma; vma = vma->vm_next) {
  60                 int pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
  61
  62                 size += pages;
  63                 if (is_vm_hugetlb_page(vma)) {
  64                         if (!(vma->vm_flags & VM_DONTCOPY))
  65                                 *shared += pages;
  66                         continue;
  67                 }
  68                 if (vma->vm_file)
  69                         *shared += pages;
  70                 if (vma->vm_flags & VM_EXECUTABLE)
  71                         *text += pages;
  72                 else
  73                         *data += pages;
  74         }
  75
  76         return size;
  77 }
  78
  79 static int show_map(struct seq_file *m, void *v)
  80 {
  81         struct vm_area_struct *map = v;
  82         struct file *file = map->vm_file;
  83         int flags = map->vm_flags;
  84         unsigned long ino = 0;
  85         dev_t dev = 0;
  86         int len;
  87
  88         if (file) {
  89                 struct inode *inode = map->vm_file->f_dentry->d_inode;
  90                 dev = inode->i_sb->s_dev;
  91                 ino = inode->i_ino;
  92         }
  93
  94         seq_printf(m, "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
  95                         map->vm_start,
  96                         map->vm_end,
  97                         flags & VM_READ ? 'r' : '-',
  98                         flags & VM_WRITE ? 'w' : '-',
  99                         flags & VM_EXEC ? 'x' : '-',
 100                         flags & VM_MAYSHARE ? 's' : 'p',
 101                         map->vm_pgoff << PAGE_SHIFT,
 102                         MAJOR(dev), MINOR(dev), ino, &len);
 103
 104         if (map->vm_file) {
 105                 len = 25 + sizeof(void*) * 6 - len;
 106                 if (len < 1)
 107                         len = 1;
 108                 seq_printf(m, "%*c", len, ' ');
 109                 seq_path(m, file->f_vfsmnt, file->f_dentry, "");
 110         }
 111         seq_putc(m, '\n');
 112         return 0;
 113 }
 114
 115 static void *m_start(struct seq_file *m, loff_t *pos)
 116 {
 117         struct task_struct *task = m->private;
 118         struct mm_struct *mm = get_task_mm(task);
 119         struct vm_area_struct * map;
 120         loff_t l = *pos;
 121
 122         if (!mm)
 123                 return NULL;
 124
 125         down_read(&mm->mmap_sem);
 126         map = mm->mmap;
 127         while (l-- && map)
 128                 map = map->vm_next;
 129         if (!map) {
 130                 up_read(&mm->mmap_sem);
 131                 mmput(mm);
 132                 if (l == -1)
 133                         map = get_gate_vma(task);
 134         }
 135         return map;
 136 }
 137
 138 static void m_stop(struct seq_file *m, void *v)
 139 {
 140         struct task_struct *task = m->private;
 141         struct vm_area_struct *map = v;
 142         if (map && map != get_gate_vma(task)) {
 143                 struct mm_struct *mm = map->vm_mm;
 144                 up_read(&mm->mmap_sem);
 145                 mmput(mm);
 146         }
 147 }
 148
 149 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 150 {
 151         struct task_struct *task = m->private;
 152         struct vm_area_struct *map = v;
 153         (*pos)++;
 154         if (map->vm_next)
 155                 return map->vm_next;
 156         m_stop(m, v);
 157         if (map != get_gate_vma(task))
 158                 return get_gate_vma(task);
 159         return NULL;
 160 }
 161
 162 struct seq_operations proc_pid_maps_op = {
 163         .start  = m_start,
 164         .next   = m_next,
 165         .stop   = m_stop,
 166         .show   = show_map
 167 };