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-rw-r--r--fs/proc/task_nommu.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
new file mode 100644
index 0000000..8f68827
--- /dev/null
+++ b/fs/proc/task_nommu.c
@@ -0,0 +1,164 @@
+
+#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(&current->fs->count) > 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 */
+
+ 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
+};
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