300 строки
6.4 KiB
C
300 строки
6.4 KiB
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)
|
|
{
|
|
VMA_ITERATOR(vmi, mm, 0);
|
|
struct vm_area_struct *vma;
|
|
struct vm_region *region;
|
|
unsigned long bytes = 0, sbytes = 0, slack = 0, size;
|
|
|
|
mmap_read_lock(mm);
|
|
for_each_vma(vmi, vma) {
|
|
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(¤t->files->count) > 1)
|
|
sbytes += kobjsize(current->files);
|
|
else
|
|
bytes += kobjsize(current->files);
|
|
|
|
if (current->sighand && refcount_read(¤t->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);
|
|
|
|
mmap_read_unlock(mm);
|
|
}
|
|
|
|
unsigned long task_vsize(struct mm_struct *mm)
|
|
{
|
|
VMA_ITERATOR(vmi, mm, 0);
|
|
struct vm_area_struct *vma;
|
|
unsigned long vsize = 0;
|
|
|
|
mmap_read_lock(mm);
|
|
for_each_vma(vmi, vma)
|
|
vsize += vma->vm_end - vma->vm_start;
|
|
mmap_read_unlock(mm);
|
|
return vsize;
|
|
}
|
|
|
|
unsigned long task_statm(struct mm_struct *mm,
|
|
unsigned long *shared, unsigned long *text,
|
|
unsigned long *data, unsigned long *resident)
|
|
{
|
|
VMA_ITERATOR(vmi, mm, 0);
|
|
struct vm_area_struct *vma;
|
|
struct vm_region *region;
|
|
unsigned long size = kobjsize(mm);
|
|
|
|
mmap_read_lock(mm);
|
|
for_each_vma(vmi, vma) {
|
|
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;
|
|
mmap_read_unlock(mm);
|
|
size >>= PAGE_SHIFT;
|
|
size += *text + *data;
|
|
*resident = size;
|
|
return size;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* display a single VMA to a sequenced file
|
|
*/
|
|
static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
|
|
{
|
|
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_puts(m, "[stack]");
|
|
}
|
|
|
|
seq_putc(m, '\n');
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* display mapping lines for a particular process's /proc/pid/maps
|
|
*/
|
|
static int show_map(struct seq_file *m, void *_p)
|
|
{
|
|
return nommu_vma_show(m, _p);
|
|
}
|
|
|
|
static void *m_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
struct proc_maps_private *priv = m->private;
|
|
struct mm_struct *mm;
|
|
struct vm_area_struct *vma;
|
|
unsigned long addr = *pos;
|
|
|
|
/* See m_next(). Zero at the start or after lseek. */
|
|
if (addr == -1UL)
|
|
return NULL;
|
|
|
|
/* 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;
|
|
|
|
if (mmap_read_lock_killable(mm)) {
|
|
mmput(mm);
|
|
return ERR_PTR(-EINTR);
|
|
}
|
|
|
|
/* start the next element from addr */
|
|
vma = find_vma(mm, addr);
|
|
if (vma)
|
|
return vma;
|
|
|
|
mmap_read_unlock(mm);
|
|
mmput(mm);
|
|
return NULL;
|
|
}
|
|
|
|
static void m_stop(struct seq_file *m, void *_vml)
|
|
{
|
|
struct proc_maps_private *priv = m->private;
|
|
|
|
if (!IS_ERR_OR_NULL(_vml)) {
|
|
mmap_read_unlock(priv->mm);
|
|
mmput(priv->mm);
|
|
}
|
|
if (priv->task) {
|
|
put_task_struct(priv->task);
|
|
priv->task = NULL;
|
|
}
|
|
}
|
|
|
|
static void *m_next(struct seq_file *m, void *_p, loff_t *pos)
|
|
{
|
|
struct vm_area_struct *vma = _p;
|
|
|
|
*pos = vma->vm_end;
|
|
return find_vma(vma->vm_mm, vma->vm_end);
|
|
}
|
|
|
|
static const 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,
|
|
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;
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
|
|
static int pid_maps_open(struct inode *inode, struct file *file)
|
|
{
|
|
return maps_open(inode, file, &proc_pid_maps_ops);
|
|
}
|
|
|
|
const struct file_operations proc_pid_maps_operations = {
|
|
.open = pid_maps_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = map_release,
|
|
};
|
|
|