[PATCH 3/8] Add container pointer on mm_struct

[Pavel Emelianov <xemul@openvz.org>]

Naturally mm_struct determines the resource consumer in memory
accounting. So each mm_struct should have a pointer on container
it belongs to. When a new task is created its mm_struct is
assigned to the container this task belongs to.

include/linux/rss_container.h is added in this patch to make
this valid apart from the whole set, but the content of it is
just a set of stubs.

Signed-off-by: Pavel Emelianov <xemul@openvz.org>

---

diff -upr linux-2.6.22-rc2-mm1.orig/include/linux/sched.h linux-2.6.22-rc2-mm1-2/include/linux/sched.h
--- linux-2.6.22-rc2-mm1.orig/include/linux/sched.h	2007-06-01 16:35:12.000000000 +0400
+++ linux-2.6.22-rc2-mm1-2/include/linux/sched.h	2007-06-01 16:35:13.000000000 +0400
@@ -390,6 +390,9 @@ struct mm_struct {
 	/* aio bits */
 	rwlock_t		ioctx_list_lock;
 	struct kioctx		*ioctx_list;
+#ifdef CONFIG_RSS_CONTAINER
+	struct rss_container	*rss_container;
+#endif
 };
 
 struct sighand_struct {
diff -upr linux-2.6.22-rc2-mm1.orig/include/linux/rss_container.h linux-2.6.22-rc2-mm1-2/include/linux/rss_container.h
--- linux-2.6.22-rc2-mm1.orig/include/linux/rss_container.h	2007-06-01 16:46:32.000000000 +0400
+++ linux-2.6.22-rc2-mm1-2/include/linux/rss_container.h	2007-06-01 16:35:15.000000000 +0400
@@ -0,0 +1,19 @@
+#ifndef __RSS_CONTAINER_H__
+#define __RSS_CONTAINER_H__
+/*
+ * RSS container
+ *
+ * Copyright 2007 OpenVZ SWsoft Inc
+ *
+ * Author: Pavel Emelianov <xemul@openvz.org>
+ *
+ */
+
+static inline void mm_init_container(struct mm_struct *mm, struct task_struct *t)
+{
+}
+
+static inline void mm_free_container(struct mm_struct *mm)
+{
+}
+#endif
diff -upr linux-2.6.22-rc2-mm1.orig/kernel/fork.c linux-2.6.22-rc2-mm1-2/kernel/fork.c
--- linux-2.6.22-rc2-mm1.orig/kernel/fork.c	2007-06-01 16:35:12.000000000 +0400
+++ linux-2.6.22-rc2-mm1-2/kernel/fork.c	2007-06-01 16:35:13.000000000 +0400
@@ -57,6 +57,8 @@
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 
+#include <linux/rss_container.h>
+
 /*
  * Protected counters by write_lock_irq(&tasklist_lock)
  */
@@ -329,7 +331,7 @@ static inline void mm_free_pgd(struct mm
 
 #include <linux/init_task.h>
 
-static struct mm_struct * mm_init(struct mm_struct * mm)
+static struct mm_struct * mm_init(struct mm_struct *mm, struct task_struct *tsk)
 {
 	atomic_set(&mm->mm_users, 1);
 	atomic_set(&mm->mm_count, 1);
@@ -344,11 +346,14 @@ static struct mm_struct * mm_init(struct
 	mm->ioctx_list = NULL;
 	mm->free_area_cache = TASK_UNMAPPED_BASE;
 	mm->cached_hole_size = ~0UL;
+	mm_init_container(mm, tsk);
 
 	if (likely(!mm_alloc_pgd(mm))) {
 		mm->def_flags = 0;
 		return mm;
 	}
+
+	mm_free_container(mm);
 	free_mm(mm);
 	return NULL;
 }
@@ -363,7 +368,7 @@ struct mm_struct * mm_alloc(void)
 	mm = allocate_mm();
 	if (mm) {
 		memset(mm, 0, sizeof(*mm));
-		mm = mm_init(mm);
+		mm = mm_init(mm, current);
 	}
 	return mm;
 }
@@ -377,6 +382,7 @@ void fastcall __mmdrop(struct mm_struct 
 {
 	BUG_ON(mm == &init_mm);
 	mm_free_pgd(mm);
+	mm_free_container(mm);
 	destroy_context(mm);
 	free_mm(mm);
 }
@@ -497,7 +503,7 @@ static struct mm_struct *dup_mm(struct t
 	mm->token_priority = 0;
 	mm->last_interval = 0;
 
-	if (!mm_init(mm))
+	if (!mm_init(mm, tsk))
 		goto fail_nomem;
 
 	if (init_new_context(tsk, mm))
@@ -524,6 +530,7 @@ fail_nocontext:
 	 * because it calls destroy_context()
 	 */
 	mm_free_pgd(mm);
+	mm_free_container(mm);
 	free_mm(mm);
 	return NULL;
 }