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Subject[-mm PATCH 8/8] Add switch to control what type of pages to limit (v2)


Choose if we want cached pages to be accounted or not. By default both
are accounted for. A new set of tunables are added.

echo -n 1 > mem_control_type
switches the accounting to account for only mapped pages

echo -n 2 > mem_control_type
switches the behaviour back


Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
---
include/linux/memcontrol.h | 9 +++
mm/filemap.c | 2
mm/memcontrol.c | 129 ++++++++++++++++++++++++++++++++++++++-------
mm/swap_state.c | 2
4 files changed, 122 insertions(+), 20 deletions(-)
diff -puN mm/memcontrol.c~mem-control-choose-rss-vs-rss-and-pagecache mm/memcontrol.c
--- linux-2.6.22-rc6/mm/memcontrol.c~mem-control-choose-rss-vs-rss-and-pagecache 2007-07-05 20:00:07.000000000 -0700
+++ linux-2.6.22-rc6-balbir/mm/memcontrol.c 2007-07-05 20:09:40.000000000 -0700
@@ -22,6 +22,8 @@
#include <linux/swap.h>
#include <linux/spinlock.h>

+#include <asm/uaccess.h>
+
struct container_subsys mem_container_subsys;

/*
@@ -52,6 +54,7 @@ struct mem_container {
* spin_lock to protect the per container LRU
*/
spinlock_t lru_lock;
+ unsigned long control_type; /* control RSS or RSS+Pagecache */
};

/*
@@ -65,6 +68,14 @@ struct meta_page {
atomic_t ref_cnt;
};

+enum {
+ MEM_CONTAINER_TYPE_UNSPEC = 0,
+ MEM_CONTAINER_TYPE_MAPPED,
+ MEM_CONTAINER_TYPE_ALL,
+ MEM_CONTAINER_TYPE_MAX,
+} mem_control_type;
+
+static struct mem_container init_mem_container;

static inline struct mem_container *mem_container_from_cont(struct container
*cnt)
@@ -301,6 +312,22 @@ err:
}

/*
+ * See if the cached pages should be charged at all?
+ */
+int mem_container_cache_charge(struct page *page, struct mm_struct *mm)
+{
+ struct mem_container *mem;
+ if (!mm)
+ mm = &init_mm;
+
+ mem = rcu_dereference(mm->mem_container);
+ if (mem->control_type & MEM_CONTAINER_TYPE_ALL)
+ return mem_container_charge(page, mm);
+ else
+ return 0;
+}
+
+/*
* Uncharging is always a welcome operation, we never complain, simply
* uncharge.
*/
@@ -311,7 +338,9 @@ void mem_container_uncharge(struct meta_
unsigned long flags;

/*
- * This can happen for PAGE_ZERO
+ * This can happen for PAGE_ZERO. This can also handle cases when
+ * a page is not charged at all and we are switching between
+ * handling the control_type.
*/
if (!mp)
return;
@@ -350,26 +379,59 @@ static ssize_t mem_container_write(struc
cft->private, userbuf, nbytes, ppos);
}

-static struct cftype mem_container_usage = {
- .name = "mem_usage",
- .private = RES_USAGE,
- .read = mem_container_read,
-};
+static ssize_t mem_control_type_write(struct container *cont,
+ struct cftype *cft, struct file *file,
+ const char __user *userbuf,
+ size_t nbytes, loff_t *pos)
+{
+ int ret;
+ char *buf, *end;
+ unsigned long tmp;
+ struct mem_container *mem;

-static struct cftype mem_container_limit = {
- .name = "mem_limit",
- .private = RES_LIMIT,
- .write = mem_container_write,
- .read = mem_container_read,
-};
+ mem = mem_container_from_cont(cont);
+ buf = kmalloc(nbytes + 1, GFP_KERNEL);
+ ret = -ENOMEM;
+ if (buf == NULL)
+ goto out;

-static struct cftype mem_container_failcnt = {
- .name = "mem_failcnt",
- .private = RES_FAILCNT,
- .read = mem_container_read,
-};
+ buf[nbytes] = 0;
+ ret = -EFAULT;
+ if (copy_from_user(buf, userbuf, nbytes))
+ goto out_free;
+
+ ret = -EINVAL;
+ tmp = simple_strtoul(buf, &end, 10);
+ if (*end != '\0')
+ goto out_free;
+
+ if (tmp <= MEM_CONTAINER_TYPE_UNSPEC || tmp >= MEM_CONTAINER_TYPE_MAX)
+ goto out_free;
+
+ mem->control_type = tmp;
+ ret = nbytes;
+out_free:
+ kfree(buf);
+out:
+ return ret;
+}

-static struct mem_container init_mem_container;
+static ssize_t mem_control_type_read(struct container *cont,
+ struct cftype *cft,
+ struct file *file, char __user *userbuf,
+ size_t nbytes, loff_t *ppos)
+{
+ unsigned long val;
+ char buf[64], *s;
+ struct mem_container *mem;
+
+ mem = mem_container_from_cont(cont);
+ s = buf;
+ val = mem->control_type;
+ s += sprintf(s, "%lu\n", val);
+ return simple_read_from_buffer((void __user *)userbuf, nbytes,
+ ppos, buf, s - buf);
+}

static int mem_container_create(struct container_subsys *ss,
struct container *cont)
@@ -392,9 +454,36 @@ static int mem_container_create(struct c
INIT_LIST_HEAD(&mem->active_list);
INIT_LIST_HEAD(&mem->inactive_list);
spin_lock_init(&mem->lru_lock);
+ mem->control_type = MEM_CONTAINER_TYPE_ALL;
return 0;
}

+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_control_type = {
+ .name = "mem_control_type",
+ .write = mem_control_type_write,
+ .read = mem_control_type_read,
+};
+
+static struct cftype mem_container_failcnt = {
+ .name = "mem_failcnt",
+ .private = RES_FAILCNT,
+ .read = mem_container_read,
+};
+
+
static void mem_container_destroy(struct container_subsys *ss,
struct container *cont)
{
@@ -418,6 +507,10 @@ static int mem_container_populate(struct
if (rc < 0)
goto err;

+ rc = container_add_file(cont, &mem_container_control_type);
+ if (rc < 0)
+ goto err;
+
err:
return rc;
}
diff -puN include/linux/memcontrol.h~mem-control-choose-rss-vs-rss-and-pagecache include/linux/memcontrol.h
--- linux-2.6.22-rc6/include/linux/memcontrol.h~mem-control-choose-rss-vs-rss-and-pagecache 2007-07-05 20:00:07.000000000 -0700
+++ linux-2.6.22-rc6-balbir/include/linux/memcontrol.h 2007-07-05 20:00:07.000000000 -0700
@@ -15,6 +15,8 @@
#ifndef _LINUX_MEMCONTROL_H
#define _LINUX_MEMCONTROL_H

+#include <linux/mm.h>
+
struct mem_container;
struct meta_page;

@@ -34,6 +36,7 @@ extern unsigned long mem_container_isola
struct mem_container *mem_cont,
int active);
extern void mem_container_out_of_memory(struct mem_container *mem);
+extern int mem_container_cache_charge(struct page *page, struct mm_struct *mm);

#else /* CONFIG_CONTAINER_MEM_CONT */
static inline void mm_init_container(struct mm_struct *mm,
@@ -68,6 +71,12 @@ static inline void mem_container_move_li
{
}

+static inline int mem_container_cache_charge(struct page *page,
+ struct mm_struct *mm)
+{
+ return 0;
+}
+
#endif /* CONFIG_CONTAINER_MEM_CONT */

#endif /* _LINUX_MEMCONTROL_H */
diff -puN mm/swap_state.c~mem-control-choose-rss-vs-rss-and-pagecache mm/swap_state.c
--- linux-2.6.22-rc6/mm/swap_state.c~mem-control-choose-rss-vs-rss-and-pagecache 2007-07-05 20:00:07.000000000 -0700
+++ linux-2.6.22-rc6-balbir/mm/swap_state.c 2007-07-05 20:00:07.000000000 -0700
@@ -81,7 +81,7 @@ static int __add_to_swap_cache(struct pa
error = radix_tree_preload(gfp_mask);
if (!error) {

- error = mem_container_charge(page, current->mm);
+ error = mem_container_cache_charge(page, current->mm);
if (error)
goto out;

diff -puN mm/filemap.c~mem-control-choose-rss-vs-rss-and-pagecache mm/filemap.c
--- linux-2.6.22-rc6/mm/filemap.c~mem-control-choose-rss-vs-rss-and-pagecache 2007-07-05 20:00:07.000000000 -0700
+++ linux-2.6.22-rc6-balbir/mm/filemap.c 2007-07-05 20:00:07.000000000 -0700
@@ -445,7 +445,7 @@ int add_to_page_cache(struct page *page,

if (error == 0) {

- error = mem_container_charge(page, current->mm);
+ error = mem_container_cache_charge(page, current->mm);
if (error)
goto out;

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