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Memory controller: add switch to control what type of pages to limit 

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 3 > mem_control_type

switches the behaviour back

[bunk@kernel.org: mm/memcontrol.c: clenups]
[akpm@linux-foundation.org: fix sparc32 build]
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Pavel Emelianov <xemul@openvz.org>
Cc: Paul Menage <menage@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Kirill Korotaev <dev@sw.ru>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: David Rientjes <rientjes@google.com>
Cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Balbir Singh 2008-02-07 00:13:59 -08:00 committed by Linus Torvalds
parent c7ba5c9e81
commit 8697d33194
4 changed files with 106 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/memcontrol.h
View File

@ -22,6 +22,8 @@
struct mem_cgroup;
struct page_cgroup;
struct page;
struct mm_struct;
#ifdef CONFIG_CGROUP_MEM_CONT
@ -40,6 +42,7 @@ extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
struct mem_cgroup *mem_cont,
int active);
extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm);
static inline void mem_cgroup_uncharge_page(struct page *page)
{
@ -84,6 +87,12 @@ static inline void mem_cgroup_move_lists(struct page_cgroup *pc,
{
}
static inline int mem_cgroup_cache_charge(struct page *page,
struct mm_struct *mm)
{
return 0;
}
#endif /* CONFIG_CGROUP_MEM_CONT */
#endif /* _LINUX_MEMCONTROL_H */

2
mm/filemap.c
View File

@ -464,7 +464,7 @@ int add_to_page_cache(struct page *page, struct address_space *mapping,
if (error == 0) {
error = mem_cgroup_charge(page, current->mm);
error = mem_cgroup_cache_charge(page, current->mm);
if (error)
goto out;

98
mm/memcontrol.c
View File

@ -29,6 +29,8 @@
#include <linux/spinlock.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
struct cgroup_subsys mem_cgroup_subsys;
static const int MEM_CGROUP_RECLAIM_RETRIES = 5;
@ -60,6 +62,7 @@ struct mem_cgroup {
* spin_lock to protect the per cgroup LRU
*/
spinlock_t lru_lock;
unsigned long control_type; /* control RSS or RSS+Pagecache */
};
/*
@ -82,6 +85,15 @@ struct page_cgroup {
/* mapped and cached states */
};
enum {
MEM_CGROUP_TYPE_UNSPEC = 0,
MEM_CGROUP_TYPE_MAPPED,
MEM_CGROUP_TYPE_CACHED,
MEM_CGROUP_TYPE_ALL,
MEM_CGROUP_TYPE_MAX,
};
static struct mem_cgroup init_mem_cgroup;
static inline
struct mem_cgroup *mem_cgroup_from_cont(struct cgroup *cont)
@ -139,18 +151,18 @@ struct page_cgroup *page_get_page_cgroup(struct page *page)
(page->page_cgroup & ~PAGE_CGROUP_LOCK);
}
void __always_inline lock_page_cgroup(struct page *page)
static void __always_inline lock_page_cgroup(struct page *page)
{
bit_spin_lock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
VM_BUG_ON(!page_cgroup_locked(page));
}
void __always_inline unlock_page_cgroup(struct page *page)
static void __always_inline unlock_page_cgroup(struct page *page)
{
bit_spin_unlock(PAGE_CGROUP_LOCK_BIT, &page->page_cgroup);
}
void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
static void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
{
if (active)
list_move(&pc->lru, &pc->mem_cgroup->active_list);
@ -365,6 +377,22 @@ err:
return -ENOMEM;
}
/*
* See if the cached pages should be charged at all?
*/
int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm)
{
struct mem_cgroup *mem;
if (!mm)
mm = &init_mm;
mem = rcu_dereference(mm->mem_cgroup);
if (mem->control_type == MEM_CGROUP_TYPE_ALL)
return mem_cgroup_charge(page, mm);
else
return 0;
}
/*
* Uncharging is always a welcome operation, we never complain, simply
* uncharge.
@ -375,6 +403,10 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
struct page *page;
unsigned long flags;
/*
* This can handle cases when a page is not charged at all and we
* are switching between handling the control_type.
*/
if (!pc)
return;
@ -425,6 +457,60 @@ static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
mem_cgroup_write_strategy);
}
static ssize_t mem_control_type_write(struct cgroup *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_cgroup *mem;
mem = mem_cgroup_from_cont(cont);
buf = kmalloc(nbytes + 1, GFP_KERNEL);
ret = -ENOMEM;
if (buf == NULL)
goto out;
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_CGROUP_TYPE_UNSPEC || tmp >= MEM_CGROUP_TYPE_MAX)
goto out_free;
mem->control_type = tmp;
ret = nbytes;
out_free:
kfree(buf);
out:
return ret;
}
static ssize_t mem_control_type_read(struct cgroup *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_cgroup *mem;
mem = mem_cgroup_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 struct cftype mem_cgroup_files[] = {
{
.name = "usage_in_bytes",
@ -442,6 +528,11 @@ static struct cftype mem_cgroup_files[] = {
.private = RES_FAILCNT,
.read = mem_cgroup_read,
},
{
.name = "control_type",
.write = mem_control_type_write,
.read = mem_control_type_read,
},
};
static struct mem_cgroup init_mem_cgroup;
@ -464,6 +555,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
INIT_LIST_HEAD(&mem->active_list);
INIT_LIST_HEAD(&mem->inactive_list);
spin_lock_init(&mem->lru_lock);
mem->control_type = MEM_CGROUP_TYPE_ALL;
return &mem->css;
}

2
mm/swap_state.c
View File

@ -78,7 +78,7 @@ int add_to_swap_cache(struct page *page, swp_entry_t entry, gfp_t gfp_mask)
error = radix_tree_preload(gfp_mask);
if (!error) {
error = mem_cgroup_charge(page, current->mm);
error = mem_cgroup_cache_charge(page, current->mm);
if (error)
goto out;