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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 | |
12 | * "non-shared". Shared memory may get counted more then once, for | |
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 LT |
17 | { |
18 | struct vm_list_struct *vml; | |
19 | unsigned long bytes = 0, sbytes = 0, slack = 0; | |
20 | ||
21 | down_read(&mm->mmap_sem); | |
22 | for (vml = mm->context.vmlist; vml; vml = vml->next) { | |
23 | if (!vml->vma) | |
24 | continue; | |
25 | ||
26 | bytes += kobjsize(vml); | |
27 | if (atomic_read(&mm->mm_count) > 1 || | |
28 | atomic_read(&vml->vma->vm_usage) > 1 | |
29 | ) { | |
30 | sbytes += kobjsize((void *) vml->vma->vm_start); | |
31 | sbytes += kobjsize(vml->vma); | |
32 | } else { | |
33 | bytes += kobjsize((void *) vml->vma->vm_start); | |
34 | bytes += kobjsize(vml->vma); | |
35 | slack += kobjsize((void *) vml->vma->vm_start) - | |
36 | (vml->vma->vm_end - vml->vma->vm_start); | |
37 | } | |
38 | } | |
39 | ||
40 | if (atomic_read(&mm->mm_count) > 1) | |
41 | sbytes += kobjsize(mm); | |
42 | else | |
43 | bytes += kobjsize(mm); | |
44 | ||
45 | if (current->fs && atomic_read(¤t->fs->count) > 1) | |
46 | sbytes += kobjsize(current->fs); | |
47 | else | |
48 | bytes += kobjsize(current->fs); | |
49 | ||
50 | if (current->files && atomic_read(¤t->files->count) > 1) | |
51 | sbytes += kobjsize(current->files); | |
52 | else | |
53 | bytes += kobjsize(current->files); | |
54 | ||
55 | if (current->sighand && atomic_read(¤t->sighand->count) > 1) | |
56 | sbytes += kobjsize(current->sighand); | |
57 | else | |
58 | bytes += kobjsize(current->sighand); | |
59 | ||
60 | bytes += kobjsize(current); /* includes kernel stack */ | |
61 | ||
df5f8314 | 62 | seq_printf(m, |
1da177e4 LT |
63 | "Mem:\t%8lu bytes\n" |
64 | "Slack:\t%8lu bytes\n" | |
65 | "Shared:\t%8lu bytes\n", | |
66 | bytes, slack, sbytes); | |
67 | ||
68 | up_read(&mm->mmap_sem); | |
1da177e4 LT |
69 | } |
70 | ||
71 | unsigned long task_vsize(struct mm_struct *mm) | |
72 | { | |
73 | struct vm_list_struct *tbp; | |
74 | unsigned long vsize = 0; | |
75 | ||
76 | down_read(&mm->mmap_sem); | |
77 | for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) { | |
78 | if (tbp->vma) | |
79 | vsize += kobjsize((void *) tbp->vma->vm_start); | |
80 | } | |
81 | up_read(&mm->mmap_sem); | |
82 | return vsize; | |
83 | } | |
84 | ||
85 | int task_statm(struct mm_struct *mm, int *shared, int *text, | |
86 | int *data, int *resident) | |
87 | { | |
88 | struct vm_list_struct *tbp; | |
89 | int size = kobjsize(mm); | |
90 | ||
91 | down_read(&mm->mmap_sem); | |
92 | for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) { | |
93 | size += kobjsize(tbp); | |
94 | if (tbp->vma) { | |
95 | size += kobjsize(tbp->vma); | |
96 | size += kobjsize((void *) tbp->vma->vm_start); | |
97 | } | |
98 | } | |
99 | ||
100 | size += (*text = mm->end_code - mm->start_code); | |
101 | size += (*data = mm->start_stack - mm->start_data); | |
102 | up_read(&mm->mmap_sem); | |
103 | *resident = size; | |
104 | return size; | |
105 | } | |
106 | ||
1da177e4 | 107 | /* |
dbf8685c | 108 | * display mapping lines for a particular process's /proc/pid/maps |
1da177e4 | 109 | */ |
dbf8685c | 110 | static int show_map(struct seq_file *m, void *_vml) |
1da177e4 | 111 | { |
dbf8685c | 112 | struct vm_list_struct *vml = _vml; |
5096add8 | 113 | |
dbf8685c | 114 | return nommu_vma_show(m, vml->vma); |
1da177e4 | 115 | } |
dbf8685c | 116 | |
1da177e4 LT |
117 | static void *m_start(struct seq_file *m, loff_t *pos) |
118 | { | |
dbf8685c DH |
119 | struct proc_maps_private *priv = m->private; |
120 | struct vm_list_struct *vml; | |
121 | struct mm_struct *mm; | |
122 | loff_t n = *pos; | |
123 | ||
124 | /* pin the task and mm whilst we play with them */ | |
125 | priv->task = get_pid_task(priv->pid, PIDTYPE_PID); | |
126 | if (!priv->task) | |
127 | return NULL; | |
128 | ||
831830b5 | 129 | mm = mm_for_maps(priv->task); |
dbf8685c DH |
130 | if (!mm) { |
131 | put_task_struct(priv->task); | |
132 | priv->task = NULL; | |
133 | return NULL; | |
134 | } | |
135 | ||
dbf8685c DH |
136 | /* start from the Nth VMA */ |
137 | for (vml = mm->context.vmlist; vml; vml = vml->next) | |
138 | if (n-- == 0) | |
139 | return vml; | |
1da177e4 LT |
140 | return NULL; |
141 | } | |
dbf8685c DH |
142 | |
143 | static void m_stop(struct seq_file *m, void *_vml) | |
1da177e4 | 144 | { |
dbf8685c DH |
145 | struct proc_maps_private *priv = m->private; |
146 | ||
147 | if (priv->task) { | |
148 | struct mm_struct *mm = priv->task->mm; | |
149 | up_read(&mm->mmap_sem); | |
150 | mmput(mm); | |
151 | put_task_struct(priv->task); | |
152 | } | |
1da177e4 | 153 | } |
dbf8685c DH |
154 | |
155 | static void *m_next(struct seq_file *m, void *_vml, loff_t *pos) | |
1da177e4 | 156 | { |
dbf8685c DH |
157 | struct vm_list_struct *vml = _vml; |
158 | ||
159 | (*pos)++; | |
160 | return vml ? vml->next : NULL; | |
1da177e4 | 161 | } |
dbf8685c | 162 | |
03a44825 | 163 | static const struct seq_operations proc_pid_maps_ops = { |
1da177e4 LT |
164 | .start = m_start, |
165 | .next = m_next, | |
166 | .stop = m_stop, | |
167 | .show = show_map | |
168 | }; | |
662795de EB |
169 | |
170 | static int maps_open(struct inode *inode, struct file *file) | |
171 | { | |
dbf8685c DH |
172 | struct proc_maps_private *priv; |
173 | int ret = -ENOMEM; | |
174 | ||
175 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
176 | if (priv) { | |
177 | priv->pid = proc_pid(inode); | |
178 | ret = seq_open(file, &proc_pid_maps_ops); | |
179 | if (!ret) { | |
180 | struct seq_file *m = file->private_data; | |
181 | m->private = priv; | |
182 | } else { | |
183 | kfree(priv); | |
184 | } | |
662795de EB |
185 | } |
186 | return ret; | |
187 | } | |
188 | ||
00977a59 | 189 | const struct file_operations proc_maps_operations = { |
662795de EB |
190 | .open = maps_open, |
191 | .read = seq_read, | |
192 | .llseek = seq_lseek, | |
dbf8685c | 193 | .release = seq_release_private, |
662795de EB |
194 | }; |
195 |