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1da177e4 LT |
1 | |
2 | #include <linux/mm.h> | |
3 | #include <linux/file.h> | |
eb28062f | 4 | #include <linux/fdtable.h> |
5ad4e53b | 5 | #include <linux/fs_struct.h> |
1da177e4 | 6 | #include <linux/mount.h> |
5096add8 | 7 | #include <linux/ptrace.h> |
1da177e4 LT |
8 | #include <linux/seq_file.h> |
9 | #include "internal.h" | |
10 | ||
11 | /* | |
12 | * Logic: we've got two memory sums for each process, "shared", and | |
025dfdaf | 13 | * "non-shared". Shared memory may get counted more than once, for |
1da177e4 LT |
14 | * each process that owns it. Non-shared memory is counted |
15 | * accurately. | |
16 | */ | |
df5f8314 | 17 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 18 | { |
8feae131 | 19 | struct vm_area_struct *vma; |
38f71479 | 20 | struct vm_region *region; |
8feae131 | 21 | struct rb_node *p; |
38f71479 | 22 | unsigned long bytes = 0, sbytes = 0, slack = 0, size; |
1da177e4 LT |
23 | |
24 | down_read(&mm->mmap_sem); | |
8feae131 DH |
25 | for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) { |
26 | vma = rb_entry(p, struct vm_area_struct, vm_rb); | |
1da177e4 | 27 | |
8feae131 | 28 | bytes += kobjsize(vma); |
38f71479 DH |
29 | |
30 | region = vma->vm_region; | |
31 | if (region) { | |
32 | size = kobjsize(region); | |
33 | size += region->vm_end - region->vm_start; | |
34 | } else { | |
35 | size = vma->vm_end - vma->vm_start; | |
36 | } | |
37 | ||
1da177e4 | 38 | if (atomic_read(&mm->mm_count) > 1 || |
8feae131 | 39 | vma->vm_flags & VM_MAYSHARE) { |
38f71479 | 40 | sbytes += size; |
1da177e4 | 41 | } else { |
38f71479 DH |
42 | bytes += size; |
43 | if (region) | |
44 | slack = region->vm_end - vma->vm_end; | |
1da177e4 LT |
45 | } |
46 | } | |
47 | ||
48 | if (atomic_read(&mm->mm_count) > 1) | |
49 | sbytes += kobjsize(mm); | |
50 | else | |
51 | bytes += kobjsize(mm); | |
52 | ||
498052bb | 53 | if (current->fs && current->fs->users > 1) |
1da177e4 LT |
54 | sbytes += kobjsize(current->fs); |
55 | else | |
56 | bytes += kobjsize(current->fs); | |
57 | ||
58 | if (current->files && atomic_read(¤t->files->count) > 1) | |
59 | sbytes += kobjsize(current->files); | |
60 | else | |
61 | bytes += kobjsize(current->files); | |
62 | ||
63 | if (current->sighand && atomic_read(¤t->sighand->count) > 1) | |
64 | sbytes += kobjsize(current->sighand); | |
65 | else | |
66 | bytes += kobjsize(current->sighand); | |
67 | ||
68 | bytes += kobjsize(current); /* includes kernel stack */ | |
69 | ||
df5f8314 | 70 | seq_printf(m, |
1da177e4 LT |
71 | "Mem:\t%8lu bytes\n" |
72 | "Slack:\t%8lu bytes\n" | |
73 | "Shared:\t%8lu bytes\n", | |
74 | bytes, slack, sbytes); | |
75 | ||
76 | up_read(&mm->mmap_sem); | |
1da177e4 LT |
77 | } |
78 | ||
79 | unsigned long task_vsize(struct mm_struct *mm) | |
80 | { | |
8feae131 DH |
81 | struct vm_area_struct *vma; |
82 | struct rb_node *p; | |
1da177e4 LT |
83 | unsigned long vsize = 0; |
84 | ||
85 | down_read(&mm->mmap_sem); | |
8feae131 DH |
86 | for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) { |
87 | vma = rb_entry(p, struct vm_area_struct, vm_rb); | |
38f71479 | 88 | vsize += vma->vm_end - vma->vm_start; |
1da177e4 LT |
89 | } |
90 | up_read(&mm->mmap_sem); | |
91 | return vsize; | |
92 | } | |
93 | ||
94 | int task_statm(struct mm_struct *mm, int *shared, int *text, | |
95 | int *data, int *resident) | |
96 | { | |
8feae131 | 97 | struct vm_area_struct *vma; |
38f71479 | 98 | struct vm_region *region; |
8feae131 | 99 | struct rb_node *p; |
1da177e4 LT |
100 | int size = kobjsize(mm); |
101 | ||
102 | down_read(&mm->mmap_sem); | |
8feae131 DH |
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); | |
38f71479 DH |
106 | region = vma->vm_region; |
107 | if (region) { | |
108 | size += kobjsize(region); | |
109 | size += region->vm_end - region->vm_start; | |
110 | } | |
1da177e4 LT |
111 | } |
112 | ||
113 | size += (*text = mm->end_code - mm->start_code); | |
114 | size += (*data = mm->start_stack - mm->start_data); | |
115 | up_read(&mm->mmap_sem); | |
116 | *resident = size; | |
117 | return size; | |
118 | } | |
119 | ||
8feae131 DH |
120 | /* |
121 | * display a single VMA to a sequenced file | |
122 | */ | |
123 | static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma) | |
124 | { | |
125 | unsigned long ino = 0; | |
126 | struct file *file; | |
127 | dev_t dev = 0; | |
128 | int flags, len; | |
6260a4b0 | 129 | unsigned long long pgoff = 0; |
8feae131 DH |
130 | |
131 | flags = vma->vm_flags; | |
132 | file = vma->vm_file; | |
133 | ||
134 | if (file) { | |
135 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
136 | dev = inode->i_sb->s_dev; | |
137 | ino = inode->i_ino; | |
4c967291 | 138 | pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT; |
8feae131 DH |
139 | } |
140 | ||
141 | seq_printf(m, | |
33e5d769 | 142 | "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n", |
8feae131 DH |
143 | vma->vm_start, |
144 | vma->vm_end, | |
145 | flags & VM_READ ? 'r' : '-', | |
146 | flags & VM_WRITE ? 'w' : '-', | |
147 | flags & VM_EXEC ? 'x' : '-', | |
148 | flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p', | |
6260a4b0 | 149 | pgoff, |
8feae131 DH |
150 | MAJOR(dev), MINOR(dev), ino, &len); |
151 | ||
152 | if (file) { | |
153 | len = 25 + sizeof(void *) * 6 - len; | |
154 | if (len < 1) | |
155 | len = 1; | |
156 | seq_printf(m, "%*c", len, ' '); | |
157 | seq_path(m, &file->f_path, ""); | |
158 | } | |
159 | ||
160 | seq_putc(m, '\n'); | |
161 | return 0; | |
162 | } | |
163 | ||
1da177e4 | 164 | /* |
dbf8685c | 165 | * display mapping lines for a particular process's /proc/pid/maps |
1da177e4 | 166 | */ |
8feae131 | 167 | static int show_map(struct seq_file *m, void *_p) |
1da177e4 | 168 | { |
8feae131 | 169 | struct rb_node *p = _p; |
5096add8 | 170 | |
8feae131 | 171 | return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb)); |
1da177e4 | 172 | } |
dbf8685c | 173 | |
1da177e4 LT |
174 | static void *m_start(struct seq_file *m, loff_t *pos) |
175 | { | |
dbf8685c | 176 | struct proc_maps_private *priv = m->private; |
dbf8685c | 177 | struct mm_struct *mm; |
8feae131 | 178 | struct rb_node *p; |
dbf8685c DH |
179 | loff_t n = *pos; |
180 | ||
181 | /* pin the task and mm whilst we play with them */ | |
182 | priv->task = get_pid_task(priv->pid, PIDTYPE_PID); | |
183 | if (!priv->task) | |
184 | return NULL; | |
185 | ||
831830b5 | 186 | mm = mm_for_maps(priv->task); |
dbf8685c DH |
187 | if (!mm) { |
188 | put_task_struct(priv->task); | |
189 | priv->task = NULL; | |
190 | return NULL; | |
191 | } | |
00f89d21 | 192 | down_read(&mm->mmap_sem); |
dbf8685c | 193 | |
dbf8685c | 194 | /* start from the Nth VMA */ |
8feae131 | 195 | for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) |
dbf8685c | 196 | if (n-- == 0) |
8feae131 | 197 | return p; |
1da177e4 LT |
198 | return NULL; |
199 | } | |
dbf8685c DH |
200 | |
201 | static void m_stop(struct seq_file *m, void *_vml) | |
1da177e4 | 202 | { |
dbf8685c DH |
203 | struct proc_maps_private *priv = m->private; |
204 | ||
205 | if (priv->task) { | |
206 | struct mm_struct *mm = priv->task->mm; | |
207 | up_read(&mm->mmap_sem); | |
208 | mmput(mm); | |
209 | put_task_struct(priv->task); | |
210 | } | |
1da177e4 | 211 | } |
dbf8685c | 212 | |
8feae131 | 213 | static void *m_next(struct seq_file *m, void *_p, loff_t *pos) |
1da177e4 | 214 | { |
8feae131 | 215 | struct rb_node *p = _p; |
dbf8685c DH |
216 | |
217 | (*pos)++; | |
8feae131 | 218 | return p ? rb_next(p) : NULL; |
1da177e4 | 219 | } |
dbf8685c | 220 | |
03a44825 | 221 | static const struct seq_operations proc_pid_maps_ops = { |
1da177e4 LT |
222 | .start = m_start, |
223 | .next = m_next, | |
224 | .stop = m_stop, | |
225 | .show = show_map | |
226 | }; | |
662795de EB |
227 | |
228 | static int maps_open(struct inode *inode, struct file *file) | |
229 | { | |
dbf8685c DH |
230 | struct proc_maps_private *priv; |
231 | int ret = -ENOMEM; | |
232 | ||
233 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
234 | if (priv) { | |
235 | priv->pid = proc_pid(inode); | |
236 | ret = seq_open(file, &proc_pid_maps_ops); | |
237 | if (!ret) { | |
238 | struct seq_file *m = file->private_data; | |
239 | m->private = priv; | |
240 | } else { | |
241 | kfree(priv); | |
242 | } | |
662795de EB |
243 | } |
244 | return ret; | |
245 | } | |
246 | ||
00977a59 | 247 | const struct file_operations proc_maps_operations = { |
662795de EB |
248 | .open = maps_open, |
249 | .read = seq_read, | |
250 | .llseek = seq_lseek, | |
dbf8685c | 251 | .release = seq_release_private, |
662795de EB |
252 | }; |
253 |