blob: 8f68827ed10e250d9635a6854dfa5fc0b953768f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2#include <linux/mm.h>
3#include <linux/file.h>
4#include <linux/mount.h>
5#include <linux/seq_file.h>
6#include "internal.h"
7
8/*
9 * Logic: we've got two memory sums for each process, "shared", and
10 * "non-shared". Shared memory may get counted more then once, for
11 * each process that owns it. Non-shared memory is counted
12 * accurately.
13 */
14char *task_mem(struct mm_struct *mm, char *buffer)
15{
16 struct vm_list_struct *vml;
17 unsigned long bytes = 0, sbytes = 0, slack = 0;
18
19 down_read(&mm->mmap_sem);
20 for (vml = mm->context.vmlist; vml; vml = vml->next) {
21 if (!vml->vma)
22 continue;
23
24 bytes += kobjsize(vml);
25 if (atomic_read(&mm->mm_count) > 1 ||
26 atomic_read(&vml->vma->vm_usage) > 1
27 ) {
28 sbytes += kobjsize((void *) vml->vma->vm_start);
29 sbytes += kobjsize(vml->vma);
30 } else {
31 bytes += kobjsize((void *) vml->vma->vm_start);
32 bytes += kobjsize(vml->vma);
33 slack += kobjsize((void *) vml->vma->vm_start) -
34 (vml->vma->vm_end - vml->vma->vm_start);
35 }
36 }
37
38 if (atomic_read(&mm->mm_count) > 1)
39 sbytes += kobjsize(mm);
40 else
41 bytes += kobjsize(mm);
42
43 if (current->fs && atomic_read(&current->fs->count) > 1)
44 sbytes += kobjsize(current->fs);
45 else
46 bytes += kobjsize(current->fs);
47
48 if (current->files && atomic_read(&current->files->count) > 1)
49 sbytes += kobjsize(current->files);
50 else
51 bytes += kobjsize(current->files);
52
53 if (current->sighand && atomic_read(&current->sighand->count) > 1)
54 sbytes += kobjsize(current->sighand);
55 else
56 bytes += kobjsize(current->sighand);
57
58 bytes += kobjsize(current); /* includes kernel stack */
59
60 buffer += sprintf(buffer,
61 "Mem:\t%8lu bytes\n"
62 "Slack:\t%8lu bytes\n"
63 "Shared:\t%8lu bytes\n",
64 bytes, slack, sbytes);
65
66 up_read(&mm->mmap_sem);
67 return buffer;
68}
69
70unsigned long task_vsize(struct mm_struct *mm)
71{
72 struct vm_list_struct *tbp;
73 unsigned long vsize = 0;
74
75 down_read(&mm->mmap_sem);
76 for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) {
77 if (tbp->vma)
78 vsize += kobjsize((void *) tbp->vma->vm_start);
79 }
80 up_read(&mm->mmap_sem);
81 return vsize;
82}
83
84int task_statm(struct mm_struct *mm, int *shared, int *text,
85 int *data, int *resident)
86{
87 struct vm_list_struct *tbp;
88 int size = kobjsize(mm);
89
90 down_read(&mm->mmap_sem);
91 for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) {
92 size += kobjsize(tbp);
93 if (tbp->vma) {
94 size += kobjsize(tbp->vma);
95 size += kobjsize((void *) tbp->vma->vm_start);
96 }
97 }
98
99 size += (*text = mm->end_code - mm->start_code);
100 size += (*data = mm->start_stack - mm->start_data);
101 up_read(&mm->mmap_sem);
102 *resident = size;
103 return size;
104}
105
106int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
107{
108 struct vm_list_struct *vml;
109 struct vm_area_struct *vma;
110 struct task_struct *task = proc_task(inode);
111 struct mm_struct *mm = get_task_mm(task);
112 int result = -ENOENT;
113
114 if (!mm)
115 goto out;
116 down_read(&mm->mmap_sem);
117
118 vml = mm->context.vmlist;
119 vma = NULL;
120 while (vml) {
121 if ((vml->vma->vm_flags & VM_EXECUTABLE) && vml->vma->vm_file) {
122 vma = vml->vma;
123 break;
124 }
125 vml = vml->next;
126 }
127
128 if (vma) {
129 *mnt = mntget(vma->vm_file->f_vfsmnt);
130 *dentry = dget(vma->vm_file->f_dentry);
131 result = 0;
132 }
133
134 up_read(&mm->mmap_sem);
135 mmput(mm);
136out:
137 return result;
138}
139
140/*
141 * Albert D. Cahalan suggested to fake entries for the traditional
142 * sections here. This might be worth investigating.
143 */
144static int show_map(struct seq_file *m, void *v)
145{
146 return 0;
147}
148static void *m_start(struct seq_file *m, loff_t *pos)
149{
150 return NULL;
151}
152static void m_stop(struct seq_file *m, void *v)
153{
154}
155static void *m_next(struct seq_file *m, void *v, loff_t *pos)
156{
157 return NULL;
158}
159struct seq_operations proc_pid_maps_op = {
160 .start = m_start,
161 .next = m_next,
162 .stop = m_stop,
163 .show = show_map
164};