#include <linux/mm.h> #include <linux/file.h> #include <linux/fdtable.h> #include <linux/mount.h> #include <linux/ptrace.h> #include <linux/seq_file.h> #include "internal.h" /* * Logic: we've got two memory sums for each process, "shared", and * "non-shared". Shared memory may get counted more then 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_list_struct *vml; unsigned long bytes = 0, sbytes = 0, slack = 0; down_read(&mm->mmap_sem); for (vml = mm->context.vmlist; vml; vml = vml->next) { if (!vml->vma) continue; bytes += kobjsize(vml); if (atomic_read(&mm->mm_count) > 1 || atomic_read(&vml->vma->vm_usage) > 1 ) { sbytes += kobjsize((void *) vml->vma->vm_start); sbytes += kobjsize(vml->vma); } else { bytes += kobjsize((void *) vml->vma->vm_start); bytes += kobjsize(vml->vma); slack += kobjsize((void *) vml->vma->vm_start) - (vml->vma->vm_end - vml->vma->vm_start); } } if (atomic_read(&mm->mm_count) > 1) sbytes += kobjsize(mm); else bytes += kobjsize(mm); if (current->fs && atomic_read(¤t->fs->count) > 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 && atomic_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); up_read(&mm->mmap_sem); } unsigned long task_vsize(struct mm_struct *mm) { struct vm_list_struct *tbp; unsigned long vsize = 0; down_read(&mm->mmap_sem); for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) { if (tbp->vma) vsize += kobjsize((void *) tbp->vma->vm_start); } up_read(&mm->mmap_sem); return vsize; } int task_statm(struct mm_struct *mm, int *shared, int *text, int *data, int *resident) { struct vm_list_struct *tbp; int size = kobjsize(mm); down_read(&mm->mmap_sem); for (tbp = mm->context.vmlist; tbp; tbp = tbp->next) { size += kobjsize(tbp); if (tbp->vma) { size += kobjsize(tbp->vma); size += kobjsize((void *) tbp->vma->vm_start); } } size += (*text = mm->end_code - mm->start_code); size += (*data = mm->start_stack - mm->start_data); up_read(&mm->mmap_sem); *resident = size; return size; } /* * display mapping lines for a particular process's /proc/pid/maps */ static int show_map(struct seq_file *m, void *_vml) { struct vm_list_struct *vml = _vml; return nommu_vma_show(m, vml->vma); } static void *m_start(struct seq_file *m, loff_t *pos) { struct proc_maps_private *priv = m->private; struct vm_list_struct *vml; struct mm_struct *mm; loff_t n = *pos; /* pin the task and mm whilst we play with them */ priv->task = get_pid_task(priv->pid, PIDTYPE_PID); if (!priv->task) return NULL; mm = mm_for_maps(priv->task); if (!mm) { put_task_struct(priv->task); priv->task = NULL; return NULL; } /* start from the Nth VMA */ for (vml = mm->context.vmlist; vml; vml = vml->next) if (n-- == 0) return vml; return NULL; } static void m_stop(struct seq_file *m, void *_vml) { struct proc_maps_private *priv = m->private; if (priv->task) { struct mm_struct *mm = priv->task->mm; up_read(&mm->mmap_sem); mmput(mm); put_task_struct(priv->task); } } static void *m_next(struct seq_file *m, void *_vml, loff_t *pos) { struct vm_list_struct *vml = _vml; (*pos)++; return vml ? vml->next : NULL; } 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) { struct proc_maps_private *priv; int ret = -ENOMEM; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (priv) { priv->pid = proc_pid(inode); ret = seq_open(file, &proc_pid_maps_ops); if (!ret) { struct seq_file *m = file->private_data; m->private = priv; } else { kfree(priv); } } return ret; } const struct file_operations proc_maps_operations = { .open = maps_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, };