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![Arjan van de Ven](/assets/img/avatar_default.png)
Many struct file_operations in the kernel can be "const". Marking them const moves these to the .rodata section, which avoids false sharing with potential dirty data. In addition it'll catch accidental writes at compile time to these shared resources. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
229 lines
5 KiB
C
229 lines
5 KiB
C
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#include <linux/mm.h>
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#include <linux/file.h>
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#include <linux/mount.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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/*
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* Logic: we've got two memory sums for each process, "shared", and
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* "non-shared". Shared memory may get counted more then once, for
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* each process that owns it. Non-shared memory is counted
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* accurately.
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*/
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char *task_mem(struct mm_struct *mm, char *buffer)
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{
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struct vm_list_struct *vml;
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unsigned long bytes = 0, sbytes = 0, slack = 0;
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down_read(&mm->mmap_sem);
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for (vml = mm->context.vmlist; vml; vml = vml->next) {
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if (!vml->vma)
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continue;
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bytes += kobjsize(vml);
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if (atomic_read(&mm->mm_count) > 1 ||
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atomic_read(&vml->vma->vm_usage) > 1
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) {
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sbytes += kobjsize((void *) vml->vma->vm_start);
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sbytes += kobjsize(vml->vma);
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} else {
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bytes += kobjsize((void *) vml->vma->vm_start);
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bytes += kobjsize(vml->vma);
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slack += kobjsize((void *) vml->vma->vm_start) -
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(vml->vma->vm_end - vml->vma->vm_start);
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}
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}
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if (atomic_read(&mm->mm_count) > 1)
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sbytes += kobjsize(mm);
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else
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bytes += kobjsize(mm);
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if (current->fs && atomic_read(¤t->fs->count) > 1)
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sbytes += kobjsize(current->fs);
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else
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bytes += kobjsize(current->fs);
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if (current->files && atomic_read(¤t->files->count) > 1)
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sbytes += kobjsize(current->files);
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else
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bytes += kobjsize(current->files);
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if (current->sighand && atomic_read(¤t->sighand->count) > 1)
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sbytes += kobjsize(current->sighand);
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else
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bytes += kobjsize(current->sighand);
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bytes += kobjsize(current); /* includes kernel stack */
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buffer += sprintf(buffer,
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"Mem:\t%8lu bytes\n"
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"Slack:\t%8lu bytes\n"
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"Shared:\t%8lu bytes\n",
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bytes, slack, sbytes);
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up_read(&mm->mmap_sem);
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return buffer;
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}
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unsigned long task_vsize(struct mm_struct *mm)
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{
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struct vm_list_struct *tbp;
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unsigned long vsize = 0;
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down_read(&mm->mmap_sem);
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for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) {
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if (tbp->vma)
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vsize += kobjsize((void *) tbp->vma->vm_start);
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}
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up_read(&mm->mmap_sem);
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return vsize;
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}
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int task_statm(struct mm_struct *mm, int *shared, int *text,
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int *data, int *resident)
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{
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struct vm_list_struct *tbp;
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int size = kobjsize(mm);
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down_read(&mm->mmap_sem);
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for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) {
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size += kobjsize(tbp);
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if (tbp->vma) {
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size += kobjsize(tbp->vma);
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size += kobjsize((void *) tbp->vma->vm_start);
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}
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}
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size += (*text = mm->end_code - mm->start_code);
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size += (*data = mm->start_stack - mm->start_data);
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up_read(&mm->mmap_sem);
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*resident = size;
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return size;
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}
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int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
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{
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struct vm_list_struct *vml;
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struct vm_area_struct *vma;
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struct task_struct *task = get_proc_task(inode);
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struct mm_struct *mm = get_task_mm(task);
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int result = -ENOENT;
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if (!mm)
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goto out;
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down_read(&mm->mmap_sem);
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vml = mm->context.vmlist;
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vma = NULL;
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while (vml) {
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if ((vml->vma->vm_flags & VM_EXECUTABLE) && vml->vma->vm_file) {
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vma = vml->vma;
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break;
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}
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vml = vml->next;
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}
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if (vma) {
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*mnt = mntget(vma->vm_file->f_path.mnt);
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*dentry = dget(vma->vm_file->f_path.dentry);
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result = 0;
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}
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up_read(&mm->mmap_sem);
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mmput(mm);
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out:
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return result;
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}
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/*
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* display mapping lines for a particular process's /proc/pid/maps
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*/
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static int show_map(struct seq_file *m, void *_vml)
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{
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struct vm_list_struct *vml = _vml;
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return nommu_vma_show(m, vml->vma);
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}
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static void *m_start(struct seq_file *m, loff_t *pos)
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{
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struct proc_maps_private *priv = m->private;
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struct vm_list_struct *vml;
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struct mm_struct *mm;
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loff_t n = *pos;
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/* pin the task and mm whilst we play with them */
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priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
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if (!priv->task)
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return NULL;
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mm = get_task_mm(priv->task);
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if (!mm) {
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put_task_struct(priv->task);
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priv->task = NULL;
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return NULL;
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}
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down_read(&mm->mmap_sem);
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/* start from the Nth VMA */
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for (vml = mm->context.vmlist; vml; vml = vml->next)
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if (n-- == 0)
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return vml;
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return NULL;
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}
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static void m_stop(struct seq_file *m, void *_vml)
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{
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struct proc_maps_private *priv = m->private;
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if (priv->task) {
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struct mm_struct *mm = priv->task->mm;
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up_read(&mm->mmap_sem);
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mmput(mm);
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put_task_struct(priv->task);
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}
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}
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static void *m_next(struct seq_file *m, void *_vml, loff_t *pos)
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{
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struct vm_list_struct *vml = _vml;
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(*pos)++;
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return vml ? vml->next : NULL;
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}
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static struct seq_operations proc_pid_maps_ops = {
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.start = m_start,
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.next = m_next,
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.stop = m_stop,
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.show = show_map
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};
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static int maps_open(struct inode *inode, struct file *file)
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{
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struct proc_maps_private *priv;
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int ret = -ENOMEM;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (priv) {
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priv->pid = proc_pid(inode);
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ret = seq_open(file, &proc_pid_maps_ops);
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if (!ret) {
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struct seq_file *m = file->private_data;
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m->private = priv;
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} else {
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kfree(priv);
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}
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}
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return ret;
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}
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const struct file_operations proc_maps_operations = {
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.open = maps_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release_private,
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};
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