1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
#include <linux/mm.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/seq_file.h>
#include "internal.h"
/*
* Logic: we've got two memory sums for each process, "shared", and
* "non-shared". Shared memory may get counted more then once, for
* each process that owns it. Non-shared memory is counted
* accurately.
*/
char *task_mem(struct mm_struct *mm, char *buffer)
{
struct vm_list_struct *vml;
unsigned long bytes = 0, sbytes = 0, slack = 0;
down_read(&mm->mmap_sem);
for (vml = mm->context.vmlist; vml; vml = vml->next) {
if (!vml->vma)
continue;
bytes += kobjsize(vml);
if (atomic_read(&mm->mm_count) > 1 ||
atomic_read(&vml->vma->vm_usage) > 1
) {
sbytes += kobjsize((void *) vml->vma->vm_start);
sbytes += kobjsize(vml->vma);
} else {
bytes += kobjsize((void *) vml->vma->vm_start);
bytes += kobjsize(vml->vma);
slack += kobjsize((void *) vml->vma->vm_start) -
(vml->vma->vm_end - vml->vma->vm_start);
}
}
if (atomic_read(&mm->mm_count) > 1)
sbytes += kobjsize(mm);
else
bytes += kobjsize(mm);
if (current->fs && atomic_read(¤t->fs->count) > 1)
sbytes += kobjsize(current->fs);
else
bytes += kobjsize(current->fs);
if (current->files && atomic_read(¤t->files->count) > 1)
sbytes += kobjsize(current->files);
else
bytes += kobjsize(current->files);
if (current->sighand && atomic_read(¤t->sighand->count) > 1)
sbytes += kobjsize(current->sighand);
else
bytes += kobjsize(current->sighand);
bytes += kobjsize(current); /* includes kernel stack */
buffer += sprintf(buffer,
"Mem:\t%8lu bytes\n"
"Slack:\t%8lu bytes\n"
"Shared:\t%8lu bytes\n",
bytes, slack, sbytes);
up_read(&mm->mmap_sem);
return buffer;
}
unsigned long task_vsize(struct mm_struct *mm)
{
struct vm_list_struct *tbp;
unsigned long vsize = 0;
down_read(&mm->mmap_sem);
for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) {
if (tbp->vma)
vsize += kobjsize((void *) tbp->vma->vm_start);
}
up_read(&mm->mmap_sem);
return vsize;
}
int task_statm(struct mm_struct *mm, int *shared, int *text,
int *data, int *resident)
{
struct vm_list_struct *tbp;
int size = kobjsize(mm);
down_read(&mm->mmap_sem);
for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) {
size += kobjsize(tbp);
if (tbp->vma) {
size += kobjsize(tbp->vma);
size += kobjsize((void *) tbp->vma->vm_start);
}
}
size += (*text = mm->end_code - mm->start_code);
size += (*data = mm->start_stack - mm->start_data);
up_read(&mm->mmap_sem);
*resident = size;
return size;
}
int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
{
struct vm_list_struct *vml;
struct vm_area_struct *vma;
struct task_struct *task = get_proc_task(inode);
struct mm_struct *mm = get_task_mm(task);
int result = -ENOENT;
if (!mm)
goto out;
down_read(&mm->mmap_sem);
vml = mm->context.vmlist;
vma = NULL;
while (vml) {
if ((vml->vma->vm_flags & VM_EXECUTABLE) && vml->vma->vm_file) {
vma = vml->vma;
break;
}
vml = vml->next;
}
if (vma) {
*mnt = mntget(vma->vm_file->f_path.mnt);
*dentry = dget(vma->vm_file->f_path.dentry);
result = 0;
}
up_read(&mm->mmap_sem);
mmput(mm);
out:
return result;
}
/*
* display mapping lines for a particular process's /proc/pid/maps
*/
static int show_map(struct seq_file *m, void *_vml)
{
struct vm_list_struct *vml = _vml;
return nommu_vma_show(m, vml->vma);
}
static void *m_start(struct seq_file *m, loff_t *pos)
{
struct proc_maps_private *priv = m->private;
struct vm_list_struct *vml;
struct mm_struct *mm;
loff_t n = *pos;
/* pin the task and mm whilst we play with them */
priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
if (!priv->task)
return NULL;
mm = get_task_mm(priv->task);
if (!mm) {
put_task_struct(priv->task);
priv->task = NULL;
return NULL;
}
down_read(&mm->mmap_sem);
/* start from the Nth VMA */
for (vml = mm->context.vmlist; vml; vml = vml->next)
if (n-- == 0)
return vml;
return NULL;
}
static void m_stop(struct seq_file *m, void *_vml)
{
struct proc_maps_private *priv = m->private;
if (priv->task) {
struct mm_struct *mm = priv->task->mm;
up_read(&mm->mmap_sem);
mmput(mm);
put_task_struct(priv->task);
}
}
static void *m_next(struct seq_file *m, void *_vml, loff_t *pos)
{
struct vm_list_struct *vml = _vml;
(*pos)++;
return vml ? vml->next : NULL;
}
static struct seq_operations proc_pid_maps_ops = {
.start = m_start,
.next = m_next,
.stop = m_stop,
.show = show_map
};
static int maps_open(struct inode *inode, struct file *file)
{
struct proc_maps_private *priv;
int ret = -ENOMEM;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (priv) {
priv->pid = proc_pid(inode);
ret = seq_open(file, &proc_pid_maps_ops);
if (!ret) {
struct seq_file *m = file->private_data;
m->private = priv;
} else {
kfree(priv);
}
}
return ret;
}
const struct file_operations proc_maps_operations = {
.open = maps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_private,
};
|
