From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@ppc970.osdl.org>
Date: Sat, 16 Apr 2005 15:20:36 -0700
Subject: Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
---
 fs/proc/task_nommu.c | 164 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 fs/proc/task_nommu.c

(limited to 'fs/proc/task_nommu.c')

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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