3 #include <linux/file.h>
4 #include <linux/fdtable.h>
5 #include <linux/fs_struct.h>
6 #include <linux/mount.h>
7 #include <linux/ptrace.h>
8 #include <linux/slab.h>
9 #include <linux/seq_file.h>
13 * Logic: we've got two memory sums for each process, "shared", and
14 * "non-shared". Shared memory may get counted more than once, for
15 * each process that owns it. Non-shared memory is counted
18 void task_mem(struct seq_file *m, struct mm_struct *mm)
20 struct vm_area_struct *vma;
21 struct vm_region *region;
23 unsigned long bytes = 0, sbytes = 0, slack = 0, size;
25 down_read(&mm->mmap_sem);
26 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
27 vma = rb_entry(p, struct vm_area_struct, vm_rb);
29 bytes += kobjsize(vma);
31 region = vma->vm_region;
33 size = kobjsize(region);
34 size += region->vm_end - region->vm_start;
36 size = vma->vm_end - vma->vm_start;
39 if (atomic_read(&mm->mm_count) > 1 ||
40 vma->vm_flags & VM_MAYSHARE) {
45 slack = region->vm_end - vma->vm_end;
49 if (atomic_read(&mm->mm_count) > 1)
50 sbytes += kobjsize(mm);
52 bytes += kobjsize(mm);
54 if (current->fs && current->fs->users > 1)
55 sbytes += kobjsize(current->fs);
57 bytes += kobjsize(current->fs);
59 if (current->files && atomic_read(¤t->files->count) > 1)
60 sbytes += kobjsize(current->files);
62 bytes += kobjsize(current->files);
64 if (current->sighand && atomic_read(¤t->sighand->count) > 1)
65 sbytes += kobjsize(current->sighand);
67 bytes += kobjsize(current->sighand);
69 bytes += kobjsize(current); /* includes kernel stack */
73 "Slack:\t%8lu bytes\n"
74 "Shared:\t%8lu bytes\n",
75 bytes, slack, sbytes);
77 up_read(&mm->mmap_sem);
80 unsigned long task_vsize(struct mm_struct *mm)
82 struct vm_area_struct *vma;
84 unsigned long vsize = 0;
86 down_read(&mm->mmap_sem);
87 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
88 vma = rb_entry(p, struct vm_area_struct, vm_rb);
89 vsize += vma->vm_end - vma->vm_start;
91 up_read(&mm->mmap_sem);
95 unsigned long task_statm(struct mm_struct *mm,
96 unsigned long *shared, unsigned long *text,
97 unsigned long *data, unsigned long *resident)
99 struct vm_area_struct *vma;
100 struct vm_region *region;
102 unsigned long size = kobjsize(mm);
104 down_read(&mm->mmap_sem);
105 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
106 vma = rb_entry(p, struct vm_area_struct, vm_rb);
107 size += kobjsize(vma);
108 region = vma->vm_region;
110 size += kobjsize(region);
111 size += region->vm_end - region->vm_start;
115 *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
117 *data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))
119 up_read(&mm->mmap_sem);
121 size += *text + *data;
126 static int is_stack(struct proc_maps_private *priv,
127 struct vm_area_struct *vma, int is_pid)
129 struct mm_struct *mm = vma->vm_mm;
133 stack = vma->vm_start <= mm->start_stack &&
134 vma->vm_end >= mm->start_stack;
136 struct inode *inode = priv->inode;
137 struct task_struct *task;
140 task = pid_task(proc_pid(inode), PIDTYPE_PID);
142 stack = vma_is_stack_for_task(vma, task);
149 * display a single VMA to a sequenced file
151 static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
154 struct mm_struct *mm = vma->vm_mm;
155 struct proc_maps_private *priv = m->private;
156 unsigned long ino = 0;
160 unsigned long long pgoff = 0;
162 flags = vma->vm_flags;
166 struct inode *inode = file_inode(vma->vm_file);
167 dev = inode->i_sb->s_dev;
169 pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
172 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
174 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
177 flags & VM_READ ? 'r' : '-',
178 flags & VM_WRITE ? 'w' : '-',
179 flags & VM_EXEC ? 'x' : '-',
180 flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
182 MAJOR(dev), MINOR(dev), ino);
186 seq_file_path(m, file, "");
187 } else if (mm && is_stack(priv, vma, is_pid)) {
189 seq_printf(m, "[stack]");
197 * display mapping lines for a particular process's /proc/pid/maps
199 static int show_map(struct seq_file *m, void *_p, int is_pid)
201 struct rb_node *p = _p;
203 return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb),
207 static int show_pid_map(struct seq_file *m, void *_p)
209 return show_map(m, _p, 1);
212 static int show_tid_map(struct seq_file *m, void *_p)
214 return show_map(m, _p, 0);
217 static void *m_start(struct seq_file *m, loff_t *pos)
219 struct proc_maps_private *priv = m->private;
220 struct mm_struct *mm;
224 /* pin the task and mm whilst we play with them */
225 priv->task = get_proc_task(priv->inode);
227 return ERR_PTR(-ESRCH);
230 if (!mm || !atomic_inc_not_zero(&mm->mm_users))
233 down_read(&mm->mmap_sem);
234 /* start from the Nth VMA */
235 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
239 up_read(&mm->mmap_sem);
244 static void m_stop(struct seq_file *m, void *_vml)
246 struct proc_maps_private *priv = m->private;
248 if (!IS_ERR_OR_NULL(_vml)) {
249 up_read(&priv->mm->mmap_sem);
253 put_task_struct(priv->task);
258 static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
260 struct rb_node *p = _p;
263 return p ? rb_next(p) : NULL;
266 static const struct seq_operations proc_pid_maps_ops = {
273 static const struct seq_operations proc_tid_maps_ops = {
280 static int maps_open(struct inode *inode, struct file *file,
281 const struct seq_operations *ops)
283 struct proc_maps_private *priv;
285 priv = __seq_open_private(file, ops, sizeof(*priv));
290 priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
291 if (IS_ERR(priv->mm)) {
292 int err = PTR_ERR(priv->mm);
294 seq_release_private(inode, file);
302 static int map_release(struct inode *inode, struct file *file)
304 struct seq_file *seq = file->private_data;
305 struct proc_maps_private *priv = seq->private;
310 return seq_release_private(inode, file);
313 static int pid_maps_open(struct inode *inode, struct file *file)
315 return maps_open(inode, file, &proc_pid_maps_ops);
318 static int tid_maps_open(struct inode *inode, struct file *file)
320 return maps_open(inode, file, &proc_tid_maps_ops);
323 const struct file_operations proc_pid_maps_operations = {
324 .open = pid_maps_open,
327 .release = map_release,
330 const struct file_operations proc_tid_maps_operations = {
331 .open = tid_maps_open,
334 .release = map_release,