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/seq_file.h>
12 * Logic: we've got two memory sums for each process, "shared", and
13 * "non-shared". Shared memory may get counted more than once, for
14 * each process that owns it. Non-shared memory is counted
17 void task_mem(struct seq_file *m, struct mm_struct *mm)
19 struct vm_area_struct *vma;
20 struct vm_region *region;
22 unsigned long bytes = 0, sbytes = 0, slack = 0, size;
24 down_read(&mm->mmap_sem);
25 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
26 vma = rb_entry(p, struct vm_area_struct, vm_rb);
28 bytes += kobjsize(vma);
30 region = vma->vm_region;
32 size = kobjsize(region);
33 size += region->vm_end - region->vm_start;
35 size = vma->vm_end - vma->vm_start;
38 if (atomic_read(&mm->mm_count) > 1 ||
39 vma->vm_flags & VM_MAYSHARE) {
44 slack = region->vm_end - vma->vm_end;
48 if (atomic_read(&mm->mm_count) > 1)
49 sbytes += kobjsize(mm);
51 bytes += kobjsize(mm);
53 if (current->fs && current->fs->users > 1)
54 sbytes += kobjsize(current->fs);
56 bytes += kobjsize(current->fs);
58 if (current->files && atomic_read(¤t->files->count) > 1)
59 sbytes += kobjsize(current->files);
61 bytes += kobjsize(current->files);
63 if (current->sighand && atomic_read(¤t->sighand->count) > 1)
64 sbytes += kobjsize(current->sighand);
66 bytes += kobjsize(current->sighand);
68 bytes += kobjsize(current); /* includes kernel stack */
72 "Slack:\t%8lu bytes\n"
73 "Shared:\t%8lu bytes\n",
74 bytes, slack, sbytes);
76 up_read(&mm->mmap_sem);
79 unsigned long task_vsize(struct mm_struct *mm)
81 struct vm_area_struct *vma;
83 unsigned long vsize = 0;
85 down_read(&mm->mmap_sem);
86 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
87 vma = rb_entry(p, struct vm_area_struct, vm_rb);
88 vsize += vma->vm_end - vma->vm_start;
90 up_read(&mm->mmap_sem);
94 int task_statm(struct mm_struct *mm, int *shared, int *text,
95 int *data, int *resident)
97 struct vm_area_struct *vma;
98 struct vm_region *region;
100 int size = kobjsize(mm);
102 down_read(&mm->mmap_sem);
103 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
104 vma = rb_entry(p, struct vm_area_struct, vm_rb);
105 size += kobjsize(vma);
106 region = vma->vm_region;
108 size += kobjsize(region);
109 size += region->vm_end - region->vm_start;
113 size += (*text = mm->end_code - mm->start_code);
114 size += (*data = mm->start_stack - mm->start_data);
115 up_read(&mm->mmap_sem);
121 * display a single VMA to a sequenced file
123 static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
125 unsigned long ino = 0;
130 flags = vma->vm_flags;
134 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
135 dev = inode->i_sb->s_dev;
140 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
143 flags & VM_READ ? 'r' : '-',
144 flags & VM_WRITE ? 'w' : '-',
145 flags & VM_EXEC ? 'x' : '-',
146 flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
147 (unsigned long long) vma->vm_pgoff << PAGE_SHIFT,
148 MAJOR(dev), MINOR(dev), ino, &len);
151 len = 25 + sizeof(void *) * 6 - len;
154 seq_printf(m, "%*c", len, ' ');
155 seq_path(m, &file->f_path, "");
163 * display mapping lines for a particular process's /proc/pid/maps
165 static int show_map(struct seq_file *m, void *_p)
167 struct rb_node *p = _p;
169 return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb));
172 static void *m_start(struct seq_file *m, loff_t *pos)
174 struct proc_maps_private *priv = m->private;
175 struct mm_struct *mm;
179 /* pin the task and mm whilst we play with them */
180 priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
184 mm = mm_for_maps(priv->task);
186 put_task_struct(priv->task);
191 /* start from the Nth VMA */
192 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
198 static void m_stop(struct seq_file *m, void *_vml)
200 struct proc_maps_private *priv = m->private;
203 struct mm_struct *mm = priv->task->mm;
204 up_read(&mm->mmap_sem);
206 put_task_struct(priv->task);
210 static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
212 struct rb_node *p = _p;
215 return p ? rb_next(p) : NULL;
218 static const struct seq_operations proc_pid_maps_ops = {
225 static int maps_open(struct inode *inode, struct file *file)
227 struct proc_maps_private *priv;
230 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
232 priv->pid = proc_pid(inode);
233 ret = seq_open(file, &proc_pid_maps_ops);
235 struct seq_file *m = file->private_data;
244 const struct file_operations proc_maps_operations = {
248 .release = seq_release_private,