blob: 343ea1216bc8e05ddc84e75af47cfbab73fee529 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2#include <linux/mm.h>
3#include <linux/file.h>
Bryan Wueb280622008-05-04 23:12:55 +08004#include <linux/fdtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/mount.h>
Kees Cook5096add2007-05-08 00:26:04 -07006#include <linux/ptrace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/seq_file.h>
8#include "internal.h"
9
10/*
11 * Logic: we've got two memory sums for each process, "shared", and
Frederik Schwarzer025dfda2008-10-16 19:02:37 +020012 * "non-shared". Shared memory may get counted more than once, for
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * each process that owns it. Non-shared memory is counted
14 * accurately.
15 */
Eric W. Biedermandf5f8312008-02-08 04:18:33 -080016void task_mem(struct seq_file *m, struct mm_struct *mm)
Linus Torvalds1da177e2005-04-16 15:20:36 -070017{
David Howells8feae132009-01-08 12:04:47 +000018 struct vm_area_struct *vma;
David Howells38f71472009-01-08 12:04:47 +000019 struct vm_region *region;
David Howells8feae132009-01-08 12:04:47 +000020 struct rb_node *p;
David Howells38f71472009-01-08 12:04:47 +000021 unsigned long bytes = 0, sbytes = 0, slack = 0, size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23 down_read(&mm->mmap_sem);
David Howells8feae132009-01-08 12:04:47 +000024 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
25 vma = rb_entry(p, struct vm_area_struct, vm_rb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
David Howells8feae132009-01-08 12:04:47 +000027 bytes += kobjsize(vma);
David Howells38f71472009-01-08 12:04:47 +000028
29 region = vma->vm_region;
30 if (region) {
31 size = kobjsize(region);
32 size += region->vm_end - region->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 } else {
David Howells38f71472009-01-08 12:04:47 +000034 size = vma->vm_end - vma->vm_start;
35 }
36
37 if (atomic_read(&mm->mm_count) > 1 ||
38 vma->vm_flags & VM_MAYSHARE) {
39 sbytes += size;
40 } else {
41 bytes += size;
42 if (region)
43 slack = region->vm_end - vma->vm_end;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 }
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(&current->fs->count) > 1)
53 sbytes += kobjsize(current->fs);
54 else
55 bytes += kobjsize(current->fs);
56
57 if (current->files && atomic_read(&current->files->count) > 1)
58 sbytes += kobjsize(current->files);
59 else
60 bytes += kobjsize(current->files);
61
62 if (current->sighand && atomic_read(&current->sighand->count) > 1)
63 sbytes += kobjsize(current->sighand);
64 else
65 bytes += kobjsize(current->sighand);
66
67 bytes += kobjsize(current); /* includes kernel stack */
68
Eric W. Biedermandf5f8312008-02-08 04:18:33 -080069 seq_printf(m,
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 "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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77
78unsigned long task_vsize(struct mm_struct *mm)
79{
David Howells8feae132009-01-08 12:04:47 +000080 struct vm_area_struct *vma;
81 struct rb_node *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 unsigned long vsize = 0;
83
84 down_read(&mm->mmap_sem);
David Howells8feae132009-01-08 12:04:47 +000085 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
86 vma = rb_entry(p, struct vm_area_struct, vm_rb);
David Howells38f71472009-01-08 12:04:47 +000087 vsize += vma->vm_end - vma->vm_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 }
89 up_read(&mm->mmap_sem);
90 return vsize;
91}
92
93int task_statm(struct mm_struct *mm, int *shared, int *text,
94 int *data, int *resident)
95{
David Howells8feae132009-01-08 12:04:47 +000096 struct vm_area_struct *vma;
David Howells38f71472009-01-08 12:04:47 +000097 struct vm_region *region;
David Howells8feae132009-01-08 12:04:47 +000098 struct rb_node *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 int size = kobjsize(mm);
100
101 down_read(&mm->mmap_sem);
David Howells8feae132009-01-08 12:04:47 +0000102 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);
David Howells38f71472009-01-08 12:04:47 +0000105 region = vma->vm_region;
106 if (region) {
107 size += kobjsize(region);
108 size += region->vm_end - region->vm_start;
109 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119/*
David Howells8feae132009-01-08 12:04:47 +0000120 * display a single VMA to a sequenced file
121 */
122static 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
161/*
David Howellsdbf86852006-09-27 01:50:19 -0700162 * display mapping lines for a particular process's /proc/pid/maps
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 */
David Howells8feae132009-01-08 12:04:47 +0000164static int show_map(struct seq_file *m, void *_p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
David Howells8feae132009-01-08 12:04:47 +0000166 struct rb_node *p = _p;
Kees Cook5096add2007-05-08 00:26:04 -0700167
David Howells8feae132009-01-08 12:04:47 +0000168 return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169}
David Howellsdbf86852006-09-27 01:50:19 -0700170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171static void *m_start(struct seq_file *m, loff_t *pos)
172{
David Howellsdbf86852006-09-27 01:50:19 -0700173 struct proc_maps_private *priv = m->private;
David Howellsdbf86852006-09-27 01:50:19 -0700174 struct mm_struct *mm;
David Howells8feae132009-01-08 12:04:47 +0000175 struct rb_node *p;
David Howellsdbf86852006-09-27 01:50:19 -0700176 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
Al Viro831830b2008-01-02 14:09:57 +0000183 mm = mm_for_maps(priv->task);
David Howellsdbf86852006-09-27 01:50:19 -0700184 if (!mm) {
185 put_task_struct(priv->task);
186 priv->task = NULL;
187 return NULL;
188 }
189
David Howellsdbf86852006-09-27 01:50:19 -0700190 /* start from the Nth VMA */
David Howells8feae132009-01-08 12:04:47 +0000191 for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
David Howellsdbf86852006-09-27 01:50:19 -0700192 if (n-- == 0)
David Howells8feae132009-01-08 12:04:47 +0000193 return p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 return NULL;
195}
David Howellsdbf86852006-09-27 01:50:19 -0700196
197static void m_stop(struct seq_file *m, void *_vml)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
David Howellsdbf86852006-09-27 01:50:19 -0700199 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
David Howellsdbf86852006-09-27 01:50:19 -0700208
David Howells8feae132009-01-08 12:04:47 +0000209static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210{
David Howells8feae132009-01-08 12:04:47 +0000211 struct rb_node *p = _p;
David Howellsdbf86852006-09-27 01:50:19 -0700212
213 (*pos)++;
David Howells8feae132009-01-08 12:04:47 +0000214 return p ? rb_next(p) : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215}
David Howellsdbf86852006-09-27 01:50:19 -0700216
Jan Engelhardt03a44822008-02-08 04:21:19 -0800217static const struct seq_operations proc_pid_maps_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 .start = m_start,
219 .next = m_next,
220 .stop = m_stop,
221 .show = show_map
222};
Eric W. Biederman662795d2006-06-26 00:25:48 -0700223
224static int maps_open(struct inode *inode, struct file *file)
225{
David Howellsdbf86852006-09-27 01:50:19 -0700226 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 }
Eric W. Biederman662795d2006-06-26 00:25:48 -0700239 }
240 return ret;
241}
242
Arjan van de Ven00977a52007-02-12 00:55:34 -0800243const struct file_operations proc_maps_operations = {
Eric W. Biederman662795d2006-06-26 00:25:48 -0700244 .open = maps_open,
245 .read = seq_read,
246 .llseek = seq_lseek,
David Howellsdbf86852006-09-27 01:50:19 -0700247 .release = seq_release_private,
Eric W. Biederman662795d2006-06-26 00:25:48 -0700248};
249