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+/* memcontrol.c - Memory Controller
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+ *
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+ * Copyright IBM Corporation, 2007
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+ * Author Balbir Singh <balbir@linux.vnet.ibm.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/res_counter.h>
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+#include <linux/memcontrol.h>
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+#include <linux/cgroup.h>
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+
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+struct cgroup_subsys mem_cgroup_subsys;
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+
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+/*
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+ * The memory controller data structure. The memory controller controls both
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+ * page cache and RSS per cgroup. We would eventually like to provide
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+ * statistics based on the statistics developed by Rik Van Riel for clock-pro,
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+ * to help the administrator determine what knobs to tune.
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+ *
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+ * TODO: Add a water mark for the memory controller. Reclaim will begin when
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+ * we hit the water mark.
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+ */
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+struct mem_cgroup {
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+ struct cgroup_subsys_state css;
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+ /*
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+ * the counter to account for memory usage
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+ */
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+ struct res_counter res;
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+};
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+
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+/*
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+ * A page_cgroup page is associated with every page descriptor. The
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+ * page_cgroup helps us identify information about the cgroup
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+ */
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+struct page_cgroup {
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+ struct list_head lru; /* per cgroup LRU list */
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+ struct page *page;
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+ struct mem_cgroup *mem_cgroup;
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+};
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+
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+
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+static inline
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+struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
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+{
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+ return container_of(cgroup_subsys_state(cont,
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+ mem_cgroup_subsys_id), struct mem_cgroup,
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+ css);
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+}
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+
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+static ssize_t mem_cgroup_read(struct cgroup *cont, struct cftype *cft,
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+ struct file *file, char __user *userbuf, size_t nbytes,
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+ loff_t *ppos)
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+{
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+ return res_counter_read(&mem_cgroup_from_cont(cont)->res,
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+ cft->private, userbuf, nbytes, ppos);
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+}
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+
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+static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
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+ struct file *file, const char __user *userbuf,
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+ size_t nbytes, loff_t *ppos)
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+{
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+ return res_counter_write(&mem_cgroup_from_cont(cont)->res,
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+ cft->private, userbuf, nbytes, ppos);
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+}
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+
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+static struct cftype mem_cgroup_files[] = {
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+ {
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+ .name = "usage",
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+ .private = RES_USAGE,
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+ .read = mem_cgroup_read,
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+ },
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+ {
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+ .name = "limit",
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+ .private = RES_LIMIT,
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+ .write = mem_cgroup_write,
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+ .read = mem_cgroup_read,
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+ },
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+ {
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+ .name = "failcnt",
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+ .private = RES_FAILCNT,
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+ .read = mem_cgroup_read,
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+ },
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+};
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+
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+static struct cgroup_subsys_state *
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+mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
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+{
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+ struct mem_cgroup *mem;
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+
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+ mem = kzalloc(sizeof(struct mem_cgroup), GFP_KERNEL);
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+ if (!mem)
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+ return -ENOMEM;
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+
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+ res_counter_init(&mem->res);
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+ return &mem->css;
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+}
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+
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+static void mem_cgroup_destroy(struct cgroup_subsys *ss,
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+ struct cgroup *cont)
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+{
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+ kfree(mem_cgroup_from_cont(cont));
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+}
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+
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+static int mem_cgroup_populate(struct cgroup_subsys *ss,
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+ struct cgroup *cont)
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+{
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+ return cgroup_add_files(cont, ss, mem_cgroup_files,
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+ ARRAY_SIZE(mem_cgroup_files));
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+}
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+
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+struct cgroup_subsys mem_cgroup_subsys = {
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+ .name = "memory",
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+ .subsys_id = mem_cgroup_subsys_id,
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+ .create = mem_cgroup_create,
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+ .destroy = mem_cgroup_destroy,
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+ .populate = mem_cgroup_populate,
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+ .early_init = 0,
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+};
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