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                 "StaBrk:\t%08lx kB\n"
  39                 "Brk:\t%08lx kB\n"
  40                 "StaStk:\t%08lx kB\n"
  41 #if __i386__
  42                 "ExecLim:\t%08lx\n"
  43 #endif
  44                 ,
  45                 mm->total_vm << (PAGE_SHIFT-10),
  46                 mm->locked_vm << (PAGE_SHIFT-10),
  47                 mm->rss << (PAGE_SHIFT-10),
  48                 data - stack, stack,
  49                 exec - lib, lib, mm->start_brk, mm->brk, mm->start_stack
  50 #if __i386__
  51                 , mm->context.exec_limit
  52 #endif
  53                 );
  54         up_read(&mm->mmap_sem);
  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         struct vm_area_struct *vma;
  67         int size = 0;
  68
  69         *resident = mm->rss;
  70         for (vma = mm->mmap; vma; vma = vma->vm_next) {
  71                 int pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
  72
  73                 size += pages;
  74                 if (is_vm_hugetlb_page(vma)) {
  75                         if (!(vma->vm_flags & VM_DONTCOPY))
  76                                 *shared += pages;
  77                         continue;
  78                 }
  79                 if (vma->vm_file)
  80                         *shared += pages;
  81                 if (vma->vm_flags & VM_EXECUTABLE)
  82                         *text += pages;
  83                 else
  84                         *data += pages;
  85         }
  86
  87         return size;
  88 }
  89
  90 static int show_map(struct seq_file *m, void *v)
  91 {
  92         struct vm_area_struct *map = v;
  93         struct file *file = map->vm_file;
  94         int flags = map->vm_flags;
  95         unsigned long ino = 0;
  96         dev_t dev = 0;
  97         int len;
  98
  99         if (file) {
 100                 struct inode *inode = map->vm_file->f_dentry->d_inode;
 101                 dev = inode->i_sb->s_dev;
 102                 ino = inode->i_ino;
 103         }
 104
 105         seq_printf(m, "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
 106                         map->vm_start,
 107                         map->vm_end,
 108                         flags & VM_READ ? 'r' : '-',
 109                         flags & VM_WRITE ? 'w' : '-',
 110                         flags & VM_EXEC ? 'x' : '-',
 111                         flags & VM_MAYSHARE ? 's' : 'p',
 112                         map->vm_pgoff << PAGE_SHIFT,
 113                         MAJOR(dev), MINOR(dev), ino, &len);
 114
 115         if (map->vm_file) {
 116                 len = 25 + sizeof(void*) * 6 - len;
 117                 if (len < 1)
 118                         len = 1;
 119                 seq_printf(m, "%*c", len, ' ');
 120                 seq_path(m, file->f_vfsmnt, file->f_dentry, "");
 121         }
 122         seq_putc(m, '\n');
 123         return 0;
 124 }
 125
 126 static void *m_start(struct seq_file *m, loff_t *pos)
 127 {
 128         struct task_struct *task = m->private;
 129         struct mm_struct *mm = get_task_mm(task);
 130         struct vm_area_struct * map;
 131         loff_t l = *pos;
 132
 133         if (!mm)
 134                 return NULL;
 135
 136         down_read(&mm->mmap_sem);
 137         map = mm->mmap;
 138         while (l-- && map)
 139                 map = map->vm_next;
 140         if (!map) {
 141                 up_read(&mm->mmap_sem);
 142                 mmput(mm);
 143                 if (l == -1)
 144                         map = get_gate_vma(task);
 145         }
 146         return map;
 147 }
 148
 149 static void m_stop(struct seq_file *m, void *v)
 150 {
 151         struct task_struct *task = m->private;
 152         struct vm_area_struct *map = v;
 153         if (map && map != get_gate_vma(task)) {
 154                 struct mm_struct *mm = map->vm_mm;
 155                 up_read(&mm->mmap_sem);
 156                 mmput(mm);
 157         }
 158 }
 159
 160 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 161 {
 162         struct task_struct *task = m->private;
 163         struct vm_area_struct *map = v;
 164         (*pos)++;
 165         if (map->vm_next)
 166                 return map->vm_next;
 167         m_stop(m, v);
 168         if (map != get_gate_vma(task))
 169                 return get_gate_vma(task);
 170         return NULL;
 171 }
 172
 173 struct seq_operations proc_pid_maps_op = {
 174         .start  = m_start,
 175         .next   = m_next,
 176         .stop   = m_stop,
 177         .show   = show_map
 178 };