Release 4.17 fs/proc/task_nommu.c

// SPDX-License-Identifier: GPL-2.0

#include <linux/mm.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/fs_struct.h>
#include <linux/mount.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/sched/mm.h>

#include "internal.h"

/*
 * Logic: we've got two memory sums for each process, "shared", and
 * "non-shared". Shared memory may get counted more than once, for
 * each process that owns it. Non-shared memory is counted
 * accurately.
 */


void task_mem(struct seq_file *m, struct mm_struct *mm)
{
	struct vm_area_struct *vma;
	struct vm_region *region;
	struct rb_node *p;
	unsigned long bytes = 0, sbytes = 0, slack = 0, size;
        
	down_read(&mm->mmap_sem);
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
		vma = rb_entry(p, struct vm_area_struct, vm_rb);

		bytes += kobjsize(vma);

		region = vma->vm_region;
		if (region) {
			size = kobjsize(region);
			size += region->vm_end - region->vm_start;
		} else {
			size = vma->vm_end - vma->vm_start;
		}

		if (atomic_read(&mm->mm_count) > 1 ||
		    vma->vm_flags & VM_MAYSHARE) {
			sbytes += size;
		} else {
			bytes += size;
			if (region)
				slack = region->vm_end - vma->vm_end;
		}
	}

	if (atomic_read(&mm->mm_count) > 1)
		sbytes += kobjsize(mm);
	else
		bytes += kobjsize(mm);
	
	if (current->fs && current->fs->users > 1)
		sbytes += kobjsize(current->fs);
	else
		bytes += kobjsize(current->fs);

	if (current->files && atomic_read(&current->files->count) > 1)
		sbytes += kobjsize(current->files);
	else
		bytes += kobjsize(current->files);

	if (current->sighand && atomic_read(&current->sighand->count) > 1)
		sbytes += kobjsize(current->sighand);
	else
		bytes += kobjsize(current->sighand);

	bytes += kobjsize(current); /* includes kernel stack */

	seq_printf(m,
		"Mem:\t%8lu bytes\n"
		"Slack:\t%8lu bytes\n"
		"Shared:\t%8lu bytes\n",
		bytes, slack, sbytes);

	up_read(&mm->mmap_sem);
}

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Christoph Hellwig
234
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1
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David Howells
101
29.02%
4
50.00%
Eric W. Biedermann
8
2.30%
1
12.50%
Greg Ungerer
4
1.15%
1
12.50%
Al Viro
1
0.29%
1
12.50%
Total
348
100.00%
8
100.00%



unsigned long task_vsize(struct mm_struct *mm)
{
	struct vm_area_struct *vma;
	struct rb_node *p;
	unsigned long vsize = 0;

	down_read(&mm->mmap_sem);
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
		vma = rb_entry(p, struct vm_area_struct, vm_rb);
		vsize += vma->vm_end - vma->vm_start;
	}
	up_read(&mm->mmap_sem);
	return vsize;
}

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Christoph Hellwig
37
40.66%
1
20.00%
David Howells
36
39.56%
2
40.00%
William Lee Irwin III
16
17.58%
1
20.00%
Greg Ungerer
2
2.20%
1
20.00%
Total
91
100.00%
5
100.00%



unsigned long task_statm(struct mm_struct *mm,
			 unsigned long *shared, unsigned long *text,
			 unsigned long *data, unsigned long *resident)
{
	struct vm_area_struct *vma;
	struct vm_region *region;
	struct rb_node *p;
	unsigned long size = kobjsize(mm);

	down_read(&mm->mmap_sem);
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p)) {
		vma = rb_entry(p, struct vm_area_struct, vm_rb);
		size += kobjsize(vma);
		region = vma->vm_region;
		if (region) {
			size += kobjsize(region);
			size += region->vm_end - region->vm_start;
		}
	}

	*text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
		>> PAGE_SHIFT;
	*data = (PAGE_ALIGN(mm->start_stack) - (mm->start_data & PAGE_MASK))
		>> PAGE_SHIFT;
	up_read(&mm->mmap_sem);
	size >>= PAGE_SHIFT;
	size += *text + *data;
	*resident = size;
	return size;
}

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Christoph Hellwig
87
42.23%
1
12.50%
David Howells
57
27.67%
3
37.50%
Steven J. Magnani
32
15.53%
1
12.50%
William Lee Irwin III
16
7.77%
1
12.50%
Alexey Dobriyan
12
5.83%
1
12.50%
Greg Ungerer
2
0.97%
1
12.50%
Total
206
100.00%
8
100.00%



static int is_stack(struct vm_area_struct *vma)
{
	struct mm_struct *mm = vma->vm_mm;

	/*
         * We make no effort to guess what a given thread considers to be
         * its "stack".  It's not even well-defined for programs written
         * languages like Go.
         */
	return vma->vm_start <= mm->start_stack &&
		vma->vm_end >= mm->start_stack;
}

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Oleg Nesterov
11
28.95%
1
33.33%
Andrew Lutomirski
2
5.26%
1
33.33%
Total
38
100.00%
3
100.00%

/*
 * display a single VMA to a sequenced file
 */


static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma,
			  int is_pid)
{
	struct mm_struct *mm = vma->vm_mm;
	unsigned long ino = 0;
	struct file *file;
	dev_t dev = 0;
	int flags;
	unsigned long long pgoff = 0;

	flags = vma->vm_flags;
	file = vma->vm_file;

	if (file) {
		struct inode *inode = file_inode(vma->vm_file);
		dev = inode->i_sb->s_dev;
		ino = inode->i_ino;
		pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
	}

	seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
	seq_printf(m,
		   "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
		   vma->vm_start,
		   vma->vm_end,
		   flags & VM_READ ? 'r' : '-',
		   flags & VM_WRITE ? 'w' : '-',
		   flags & VM_EXEC ? 'x' : '-',
		   flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
		   pgoff,
		   MAJOR(dev), MINOR(dev), ino);

	if (file) {
		seq_pad(m, ' ');
		seq_file_path(m, file, "");
	} else if (mm && is_stack(vma)) {
		seq_pad(m, ' ');
		seq_printf(m, "[stack]");
	}

	seq_putc(m, '\n');
	return 0;
}

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11.11%
Tetsuo Handa
22
8.76%
1
11.11%
Mike Frysinger
19
7.57%
1
11.11%
Kamezawa Hiroyuki
18
7.17%
1
11.11%
Siddhesh Poyarekar
15
5.98%
1
11.11%
Al Viro
3
1.20%
1
11.11%
Johannes Weiner
2
0.80%
1
11.11%
Miklos Szeredi
1
0.40%
1
11.11%
Nobuhiro Iwamatsu
1
0.40%
1
11.11%
Total
251
100.00%
9
100.00%

/*
 * display mapping lines for a particular process's /proc/pid/maps
 */


static int show_map(struct seq_file *m, void *_p, int is_pid)
{
	struct rb_node *p = _p;

	return nommu_vma_show(m, rb_entry(p, struct vm_area_struct, vm_rb),
			      is_pid);
}

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David Howells
21
48.84%
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Andrew Morton
10
23.26%
1
20.00%
Siddhesh Poyarekar
8
18.60%
1
20.00%
Christoph Hellwig
4
9.30%
1
20.00%
Total
43
100.00%
5
100.00%



static int show_pid_map(struct seq_file *m, void *_p)
{
	return show_map(m, _p, 1);
}

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25
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1
100.00%



static int show_tid_map(struct seq_file *m, void *_p)
{
	return show_map(m, _p, 0);
}

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22
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1
33.33%
Andrew Morton
2
8.00%
1
33.33%
David Howells
1
4.00%
1
33.33%
Total
25
100.00%
3
100.00%



static void *m_start(struct seq_file *m, loff_t *pos)
{
	struct proc_maps_private *priv = m->private;
	struct mm_struct *mm;
	struct rb_node *p;
	loff_t n = *pos;

	/* pin the task and mm whilst we play with them */
	priv->task = get_proc_task(priv->inode);
	if (!priv->task)
		return ERR_PTR(-ESRCH);

	mm = priv->mm;
	if (!mm || !mmget_not_zero(mm))
		return NULL;

	down_read(&mm->mmap_sem);
	/* start from the Nth VMA */
	for (p = rb_first(&mm->mm_rb); p; p = rb_next(p))
		if (n-- == 0)
			return p;

	up_read(&mm->mmap_sem);
	mmput(mm);
	return NULL;
}

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Oleg Nesterov
26
18.18%
4
40.00%
Andrew Morton
15
10.49%
1
10.00%
Al Viro
9
6.29%
1
10.00%
Christoph Hellwig
4
2.80%
1
10.00%
Vegard Nossum
1
0.70%
1
10.00%
Total
143
100.00%
10
100.00%



static void m_stop(struct seq_file *m, void *_vml)
{
	struct proc_maps_private *priv = m->private;

	if (!IS_ERR_OR_NULL(_vml)) {
		up_read(&priv->mm->mmap_sem);
		mmput(priv->mm);
	}
	if (priv->task) {
		put_task_struct(priv->task);
		priv->task = NULL;
	}
}

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23
31.94%
1
25.00%
Andrew Morton
11
15.28%
1
25.00%
Christoph Hellwig
1
1.39%
1
25.00%
Total
72
100.00%
4
100.00%



static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
{
	struct rb_node *p = _p;

	(*pos)++;
	return p ? rb_next(p) : NULL;
}

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21
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Andrew Morton
14
32.56%
1
25.00%
Christoph Hellwig
8
18.60%
1
25.00%
Total
43
100.00%
4
100.00%


static const struct seq_operations proc_pid_maps_ops = {
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= show_pid_map
};


static const struct seq_operations proc_tid_maps_ops = {
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= show_tid_map
};



static int maps_open(struct inode *inode, struct file *file,
		     const struct seq_operations *ops)
{
	struct proc_maps_private *priv;

	priv = __seq_open_private(file, ops, sizeof(*priv));
	if (!priv)
		return -ENOMEM;

	priv->inode = inode;
	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
	if (IS_ERR(priv->mm)) {
		int err = PTR_ERR(priv->mm);

		seq_release_private(inode, file);
		return err;
	}

	return 0;
}


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22
21.57%
1
16.67%
Eric W. Biedermann
18
17.65%
1
16.67%
Siddhesh Poyarekar
6
5.88%
1
16.67%
Total
102
100.00%
6
100.00%



static int map_release(struct inode *inode, struct file *file)
{
	struct seq_file *seq = file->private_data;
	struct proc_maps_private *priv = seq->private;

	if (priv->mm)
		mmdrop(priv->mm);

	return seq_release_private(inode, file);
}

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100.00%



static int pid_maps_open(struct inode *inode, struct file *file)
{
	return maps_open(inode, file, &proc_pid_maps_ops);
}

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1
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static int tid_maps_open(struct inode *inode, struct file *file)
{
	return maps_open(inode, file, &proc_tid_maps_ops);
}

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1
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const struct file_operations proc_pid_maps_operations = {
	.open		= pid_maps_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= map_release,
};


const struct file_operations proc_tid_maps_operations = {
	.open		= tid_maps_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= map_release,
};

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David Howells
563
34.33%
5
12.20%
Christoph Hellwig
378
23.05%
1
2.44%
Siddhesh Poyarekar
187
11.40%
1
2.44%
Oleg Nesterov
173
10.55%
6
14.63%
Andrew Morton
79
4.82%
1
2.44%
Eric W. Biedermann
50
3.05%
2
4.88%
William Lee Irwin III
32
1.95%
2
4.88%
Steven J. Magnani
32
1.95%
1
2.44%
Johannes Weiner
27
1.65%
1
2.44%
Tetsuo Handa
22
1.34%
1
2.44%
Mike Frysinger
19
1.16%
1
2.44%
Kamezawa Hiroyuki
18
1.10%
1
2.44%
Al Viro
16
0.98%
4
9.76%
Alexey Dobriyan
12
0.73%
1
2.44%
Greg Ungerer
11
0.67%
1
2.44%
Bryan Wu
3
0.18%
1
2.44%
Tejun Heo
3
0.18%
1
2.44%
Ingo Molnar
3
0.18%
1
2.44%
Kees Cook
3
0.18%
1
2.44%
Andrew Lutomirski
2
0.12%
1
2.44%
Jan Engelhardt
1
0.06%
1
2.44%
Greg Kroah-Hartman
1
0.06%
1
2.44%
Miklos Szeredi
1
0.06%
1
2.44%
Arjan van de Ven
1
0.06%
1
2.44%
Nobuhiro Iwamatsu
1
0.06%
1
2.44%
Vegard Nossum
1
0.06%
1
2.44%
Frederik Schwarzer
1
0.06%
1
2.44%
Michal Hocko
0.00%
0
0.00%
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41
100.00%
Directory: fs/proc

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