#include <linux/mm.h> #include <linux/file.h> #include <linux/mount.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. */ char *task_mem(struct mm_struct *mm, char *buffer) { 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 */ buffer += sprintf(buffer, "Mem:\t%8lu bytes\n" "Slack:\t%8lu bytes\n" "Shared:\t%8lu bytes\n", bytes, slack, sbytes); up_read(&mm->mmap_sem); return buffer; } 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; } int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) { struct vm_list_struct *vml; struct vm_area_struct *vma; struct task_struct *task = proc_task(inode); struct mm_struct *mm = get_task_mm(task); int result = -ENOENT; if (!mm) goto out; down_read(&mm->mmap_sem); vml = mm->context.vmlist; vma = NULL; while (vml) { if ((vml->vma->vm_flags & VM_EXECUTABLE) && vml->vma->vm_file) { vma = vml->vma; break; } vml = vml->next; } if (vma) { *mnt = mntget(vma->vm_file->f_vfsmnt); *dentry = dget(vma->vm_file->f_dentry); result = 0; } up_read(&mm->mmap_sem); mmput(mm); out: return result; } /* * Albert D. Cahalan suggested to fake entries for the traditional * sections here. This might be worth investigating. */ static int show_map(struct seq_file *m, void *v) { return 0; } static void *m_start(struct seq_file *m, loff_t *pos) { return NULL; } static void m_stop(struct seq_file *m, void *v) { } static void *m_next(struct seq_file *m, void *v, loff_t *pos) { return NULL; } struct seq_operations proc_pid_maps_op = { .start = m_start, .next = m_next, .stop = m_stop, .show = show_map };