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1da177e4 LT |
1 | |
2 | #include <linux/mm.h> | |
3 | #include <linux/file.h> | |
eb28062f | 4 | #include <linux/fdtable.h> |
1da177e4 | 5 | #include <linux/mount.h> |
5096add8 | 6 | #include <linux/ptrace.h> |
1da177e4 LT |
7 | #include <linux/seq_file.h> |
8 | #include "internal.h" | |
9 | ||
10 | /* | |
11 | * Logic: we've got two memory sums for each process, "shared", and | |
025dfdaf | 12 | * "non-shared". Shared memory may get counted more than once, for |
1da177e4 LT |
13 | * each process that owns it. Non-shared memory is counted |
14 | * accurately. | |
15 | */ | |
df5f8314 | 16 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 17 | { |
8feae131 | 18 | struct vm_area_struct *vma; |
38f71479 | 19 | struct vm_region *region; |
8feae131 | 20 | struct rb_node *p; |
38f71479 | 21 | unsigned long bytes = 0, sbytes = 0, slack = 0, size; |
1da177e4 LT |
22 | |
23 | down_read(&mm->mmap_sem); | |
8feae131 DH |
24 | for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) { |
25 | vma = rb_entry(p, struct vm_area_struct, vm_rb); | |
1da177e4 | 26 | |
8feae131 | 27 | bytes += kobjsize(vma); |
38f71479 DH |
28 | |
29 | region = vma->vm_region; | |
30 | if (region) { | |
31 | size = kobjsize(region); | |
32 | size += region->vm_end - region->vm_start; | |
33 | } else { | |
34 | size = vma->vm_end - vma->vm_start; | |
35 | } | |
36 | ||
1da177e4 | 37 | if (atomic_read(&mm->mm_count) > 1 || |
8feae131 | 38 | vma->vm_flags & VM_MAYSHARE) { |
38f71479 | 39 | sbytes += size; |
1da177e4 | 40 | } else { |
38f71479 DH |
41 | bytes += size; |
42 | if (region) | |
43 | slack = region->vm_end - vma->vm_end; | |
1da177e4 LT |
44 | } |
45 | } | |
46 | ||
47 | if (atomic_read(&mm->mm_count) > 1) | |
48 | sbytes += kobjsize(mm); | |
49 | else | |
50 | bytes += kobjsize(mm); | |
51 | ||
52 | if (current->fs && atomic_read(¤t->fs->count) > 1) | |
53 | sbytes += kobjsize(current->fs); | |
54 | else | |
55 | bytes += kobjsize(current->fs); | |
56 | ||
57 | if (current->files && atomic_read(¤t->files->count) > 1) | |
58 | sbytes += kobjsize(current->files); | |
59 | else | |
60 | bytes += kobjsize(current->files); | |
61 | ||
62 | if (current->sighand && atomic_read(¤t->sighand->count) > 1) | |
63 | sbytes += kobjsize(current->sighand); | |
64 | else | |
65 | bytes += kobjsize(current->sighand); | |
66 | ||
67 | bytes += kobjsize(current); /* includes kernel stack */ | |
68 | ||
df5f8314 | 69 | seq_printf(m, |
1da177e4 LT |
70 | "Mem:\t%8lu bytes\n" |
71 | "Slack:\t%8lu bytes\n" | |
72 | "Shared:\t%8lu bytes\n", | |
73 | bytes, slack, sbytes); | |
74 | ||
75 | up_read(&mm->mmap_sem); | |
1da177e4 LT |
76 | } |
77 | ||
78 | unsigned long task_vsize(struct mm_struct *mm) | |
79 | { | |
8feae131 DH |
80 | struct vm_area_struct *vma; |
81 | struct rb_node *p; | |
1da177e4 LT |
82 | unsigned long vsize = 0; |
83 | ||
84 | down_read(&mm->mmap_sem); | |
8feae131 DH |
85 | for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) { |
86 | vma = rb_entry(p, struct vm_area_struct, vm_rb); | |
38f71479 | 87 | vsize += vma->vm_end - vma->vm_start; |
1da177e4 LT |
88 | } |
89 | up_read(&mm->mmap_sem); | |
90 | return vsize; | |
91 | } | |
92 | ||
93 | int task_statm(struct mm_struct *mm, int *shared, int *text, | |
94 | int *data, int *resident) | |
95 | { | |
8feae131 | 96 | struct vm_area_struct *vma; |
38f71479 | 97 | struct vm_region *region; |
8feae131 | 98 | struct rb_node *p; |
1da177e4 LT |
99 | int size = kobjsize(mm); |
100 | ||
101 | down_read(&mm->mmap_sem); | |
8feae131 DH |
102 | for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) { |
103 | vma = rb_entry(p, struct vm_area_struct, vm_rb); | |
104 | size += kobjsize(vma); | |
38f71479 DH |
105 | region = vma->vm_region; |
106 | if (region) { | |
107 | size += kobjsize(region); | |
108 | size += region->vm_end - region->vm_start; | |
109 | } | |
1da177e4 LT |
110 | } |
111 | ||
112 | size += (*text = mm->end_code - mm->start_code); | |
113 | size += (*data = mm->start_stack - mm->start_data); | |
114 | up_read(&mm->mmap_sem); | |
115 | *resident = size; | |
116 | return size; | |
117 | } | |
118 | ||
8feae131 DH |
119 | /* |
120 | * display a single VMA to a sequenced file | |
121 | */ | |
122 | static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma) | |
123 | { | |
124 | unsigned long ino = 0; | |
125 | struct file *file; | |
126 | dev_t dev = 0; | |
127 | int flags, len; | |
128 | ||
129 | flags = vma->vm_flags; | |
130 | file = vma->vm_file; | |
131 | ||
132 | if (file) { | |
133 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
134 | dev = inode->i_sb->s_dev; | |
135 | ino = inode->i_ino; | |
136 | } | |
137 | ||
138 | seq_printf(m, | |
139 | "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n", | |
140 | vma->vm_start, | |
141 | vma->vm_end, | |
142 | flags & VM_READ ? 'r' : '-', | |
143 | flags & VM_WRITE ? 'w' : '-', | |
144 | flags & VM_EXEC ? 'x' : '-', | |
145 | flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p', | |
146 | vma->vm_pgoff << PAGE_SHIFT, | |
147 | MAJOR(dev), MINOR(dev), ino, &len); | |
148 | ||
149 | if (file) { | |
150 | len = 25 + sizeof(void *) * 6 - len; | |
151 | if (len < 1) | |
152 | len = 1; | |
153 | seq_printf(m, "%*c", len, ' '); | |
154 | seq_path(m, &file->f_path, ""); | |
155 | } | |
156 | ||
157 | seq_putc(m, '\n'); | |
158 | return 0; | |
159 | } | |
160 | ||
1da177e4 | 161 | /* |
dbf8685c | 162 | * display mapping lines for a particular process's /proc/pid/maps |
1da177e4 | 163 | */ |
8feae131 | 164 | static int show_map(struct seq_file *m, void *_p) |
1da177e4 | 165 | { |
8feae131 | 166 | struct rb_node *p = _p; |
5096add8 | 167 | |
8feae131 | 168 | return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb)); |
1da177e4 | 169 | } |
dbf8685c | 170 | |
1da177e4 LT |
171 | static void *m_start(struct seq_file *m, loff_t *pos) |
172 | { | |
dbf8685c | 173 | struct proc_maps_private *priv = m->private; |
dbf8685c | 174 | struct mm_struct *mm; |
8feae131 | 175 | struct rb_node *p; |
dbf8685c DH |
176 | loff_t n = *pos; |
177 | ||
178 | /* pin the task and mm whilst we play with them */ | |
179 | priv->task = get_pid_task(priv->pid, PIDTYPE_PID); | |
180 | if (!priv->task) | |
181 | return NULL; | |
182 | ||
831830b5 | 183 | mm = mm_for_maps(priv->task); |
dbf8685c DH |
184 | if (!mm) { |
185 | put_task_struct(priv->task); | |
186 | priv->task = NULL; | |
187 | return NULL; | |
188 | } | |
189 | ||
dbf8685c | 190 | /* start from the Nth VMA */ |
8feae131 | 191 | for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) |
dbf8685c | 192 | if (n-- == 0) |
8feae131 | 193 | return p; |
1da177e4 LT |
194 | return NULL; |
195 | } | |
dbf8685c DH |
196 | |
197 | static void m_stop(struct seq_file *m, void *_vml) | |
1da177e4 | 198 | { |
dbf8685c DH |
199 | struct proc_maps_private *priv = m->private; |
200 | ||
201 | if (priv->task) { | |
202 | struct mm_struct *mm = priv->task->mm; | |
203 | up_read(&mm->mmap_sem); | |
204 | mmput(mm); | |
205 | put_task_struct(priv->task); | |
206 | } | |
1da177e4 | 207 | } |
dbf8685c | 208 | |
8feae131 | 209 | static void *m_next(struct seq_file *m, void *_p, loff_t *pos) |
1da177e4 | 210 | { |
8feae131 | 211 | struct rb_node *p = _p; |
dbf8685c DH |
212 | |
213 | (*pos)++; | |
8feae131 | 214 | return p ? rb_next(p) : NULL; |
1da177e4 | 215 | } |
dbf8685c | 216 | |
03a44825 | 217 | static const struct seq_operations proc_pid_maps_ops = { |
1da177e4 LT |
218 | .start = m_start, |
219 | .next = m_next, | |
220 | .stop = m_stop, | |
221 | .show = show_map | |
222 | }; | |
662795de EB |
223 | |
224 | static int maps_open(struct inode *inode, struct file *file) | |
225 | { | |
dbf8685c DH |
226 | struct proc_maps_private *priv; |
227 | int ret = -ENOMEM; | |
228 | ||
229 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
230 | if (priv) { | |
231 | priv->pid = proc_pid(inode); | |
232 | ret = seq_open(file, &proc_pid_maps_ops); | |
233 | if (!ret) { | |
234 | struct seq_file *m = file->private_data; | |
235 | m->private = priv; | |
236 | } else { | |
237 | kfree(priv); | |
238 | } | |
662795de EB |
239 | } |
240 | return ret; | |
241 | } | |
242 | ||
00977a59 | 243 | const struct file_operations proc_maps_operations = { |
662795de EB |
244 | .open = maps_open, |
245 | .read = seq_read, | |
246 | .llseek = seq_lseek, | |
dbf8685c | 247 | .release = seq_release_private, |
662795de EB |
248 | }; |
249 |