Setup the memory container and add basic hooks and controls to integrate
and work with the container.

Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
---

 include/linux/container_subsys.h |    6 +
 include/linux/memcontrol.h       |   19 +++++
 init/Kconfig                     |    8 ++
 mm/Makefile                      |    1 
 mm/memcontrol.c                  |  141 +++++++++++++++++++++++++++++++++++++++
 5 files changed, 175 insertions(+)

diff -puN include/linux/container_subsys.h~mem-control-setup include/linux/container_subsys.h
--- linux-2.6.22-rc6/include/linux/container_subsys.h~mem-control-setup	2007-07-04 15:05:22.000000000 -0700
+++ linux-2.6.22-rc6-balbir/include/linux/container_subsys.h	2007-07-04 15:05:22.000000000 -0700
@@ -30,3 +30,9 @@ SUBSYS(ns)
 #endif
 
 /* */
+
+#ifdef CONFIG_CONTAINER_MEM_CONT
+SUBSYS(mem_container)
+#endif
+
+/* */
diff -puN init/Kconfig~mem-control-setup init/Kconfig
--- linux-2.6.22-rc6/init/Kconfig~mem-control-setup	2007-07-04 15:05:22.000000000 -0700
+++ linux-2.6.22-rc6-balbir/init/Kconfig	2007-07-04 15:05:22.000000000 -0700
@@ -360,6 +360,14 @@ config CONTAINER_NS
           for instance virtual servers and checkpoint/restart
           jobs.
 
+config CONTAINER_MEM_CONT
+	bool "Memory controller for containers"
+	select CONTAINERS
+	select RESOURCE_COUNTERS
+	help
+	  Provides a memory controller that manages both page cache and
+	  RSS memory.
+
 config PROC_PID_CPUSET
 	bool "Include legacy /proc/<pid>/cpuset file"
 	depends on CPUSETS
diff -puN mm/Makefile~mem-control-setup mm/Makefile
--- linux-2.6.22-rc6/mm/Makefile~mem-control-setup	2007-07-04 15:05:22.000000000 -0700
+++ linux-2.6.22-rc6-balbir/mm/Makefile	2007-07-04 15:05:22.000000000 -0700
@@ -30,4 +30,5 @@ obj-$(CONFIG_FS_XIP) += filemap_xip.o
 obj-$(CONFIG_MIGRATION) += migrate.o
 obj-$(CONFIG_SMP) += allocpercpu.o
 obj-$(CONFIG_QUICKLIST) += quicklist.o
+obj-$(CONFIG_CONTAINER_MEM_CONT) += memcontrol.o
 
diff -puN /dev/null mm/memcontrol.c
--- /dev/null	2007-06-01 08:12:04.000000000 -0700
+++ linux-2.6.22-rc6-balbir/mm/memcontrol.c	2007-07-04 15:05:22.000000000 -0700
@@ -0,0 +1,141 @@
+/* memcontrol.c - Memory Controller
+ *
+ * Copyright IBM Corporation, 2007
+ * Author Balbir Singh <balbir@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include <linux/res_counter.h>
+#include <linux/memcontrol.h>
+#include <linux/container.h>
+
+struct container_subsys mem_container_subsys;
+
+/*
+ * The memory controller data structure. The memory controller controls both
+ * page cache and RSS per container. We would eventually like to provide
+ * statistics based on the statistics developed by Rik Van Riel for clock-pro,
+ * to help the administrator determine what knobs to tune.
+ *
+ * TODO: Add a water mark for the memory controller. Reclaim will begin when
+ * we hit the water mark.
+ */
+struct mem_container {
+	struct container_subsys_state css;
+	/*
+	 * the counter to account for memory usage
+	 */
+	struct res_counter res;
+};
+
+/*
+ * A meta page is associated with every page descriptor. The meta page
+ * helps us identify information about the container
+ */
+struct meta_page {
+	struct list_head list;		/* per container LRU list */
+	struct page *page;
+	struct mem_container *mem_container;
+};
+
+
+static inline struct mem_container *mem_container_from_cont(struct container
+								*cnt)
+{
+	return container_of(container_subsys_state(cnt,
+				mem_container_subsys_id), struct mem_container,
+				css);
+}
+
+static ssize_t mem_container_read(struct container *cont, struct cftype *cft,
+			struct file *file, char __user *userbuf, size_t nbytes,
+			loff_t *ppos)
+{
+	return res_counter_read(&mem_container_from_cont(cont)->res,
+				cft->private, userbuf, nbytes, ppos);
+}
+
+static ssize_t mem_container_write(struct container *cont, struct cftype *cft,
+				struct file *file, const char __user *userbuf,
+				size_t nbytes, loff_t *ppos)
+{
+	return res_counter_write(&mem_container_from_cont(cont)->res,
+				cft->private, userbuf, nbytes, ppos);
+}
+
+static struct cftype mem_container_usage = {
+	.name = "mem_usage",
+	.private = RES_USAGE,
+	.read = mem_container_read,
+};
+
+static struct cftype mem_container_limit = {
+	.name = "mem_limit",
+	.private = RES_LIMIT,
+	.write = mem_container_write,
+	.read = mem_container_read,
+};
+
+static struct cftype mem_container_failcnt = {
+	.name = "mem_failcnt",
+	.private = RES_FAILCNT,
+	.read = mem_container_read,
+};
+
+static int mem_container_create(struct container_subsys *ss,
+				struct container *cont)
+{
+	struct mem_container *mem;
+
+	mem = kzalloc(sizeof(struct mem_container), GFP_KERNEL);
+	if (!mem)
+		return -ENOMEM;
+
+	res_counter_init(&mem->res);
+	cont->subsys[mem_container_subsys_id] = &mem->css;
+	mem->css.container = cont;
+	return 0;
+}
+
+static void mem_container_destroy(struct container_subsys *ss,
+				struct container *cont)
+{
+	kfree(mem_container_from_cont(cont));
+}
+
+static int mem_container_populate(struct container_subsys *ss,
+				struct container *cont)
+{
+	int rc = 0;
+
+	rc = container_add_file(cont, &mem_container_usage);
+	if (rc < 0)
+		goto err;
+
+	rc = container_add_file(cont, &mem_container_limit);
+	if (rc < 0)
+		goto err;
+
+	rc = container_add_file(cont, &mem_container_failcnt);
+	if (rc < 0)
+		goto err;
+
+err:
+	return rc;
+}
+
+struct container_subsys mem_container_subsys = {
+	.name = "mem_container",
+	.subsys_id = mem_container_subsys_id,
+	.create = mem_container_create,
+	.destroy = mem_container_destroy,
+	.populate = mem_container_populate,
+	.early_init = 0,
+};
diff -puN /dev/null include/linux/memcontrol.h
--- /dev/null	2007-06-01 08:12:04.000000000 -0700
+++ linux-2.6.22-rc6-balbir/include/linux/memcontrol.h	2007-07-04 15:05:22.000000000 -0700
@@ -0,0 +1,19 @@
+/* memcontrol.h - Memory Controller
+ *
+ * Copyright IBM Corporation, 2007
+ * Author Balbir Singh <balbir@linux.vnet.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#ifndef _LINUX_MEMCONTROL_H
+#define _LINUX_MEMCONTROL_H
+
+#endif /* _LINUX_MEMCONTROL_H */
+
_

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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