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Memory controller remove control_type feature 

Based on the discussion at http://lkml.org/lkml/2007/12/20/383, it was felt
that control_type might not be a good thing to implement right away.  We
can add this flexibility at a later point when required.

Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
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 00:14:41 -08:00 committed by Linus Torvalds
parent 072c56c13e
commit 3c541e14bf
2 changed files with 18 additions and 79 deletions
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6
include/linux/memcontrol.h
View File

@ -38,6 +38,7 @@ extern struct page_cgroup *page_get_page_cgroup(struct page *page);
extern int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask);
extern void mem_cgroup_uncharge(struct page_cgroup *pc);
extern void mem_cgroup_uncharge_page(struct page *page);
extern void mem_cgroup_move_lists(struct page_cgroup *pc, bool active);
extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
struct list_head *dst,
@ -55,11 +56,6 @@ static inline struct mem_cgroup *mm_cgroup(const struct mm_struct *mm)
return rcu_dereference(mm->mem_cgroup);
}
static inline void mem_cgroup_uncharge_page(struct page *page)
{
mem_cgroup_uncharge(page_get_page_cgroup(page));
}
extern int mem_cgroup_prepare_migration(struct page *page);
extern void mem_cgroup_end_migration(struct page *page);
extern void mem_cgroup_page_migration(struct page *page, struct page *newpage);

91
mm/memcontrol.c
View File

@ -131,7 +131,6 @@ struct mem_cgroup {
*/
struct mem_cgroup_lru_info info;
unsigned long control_type; /* control RSS or RSS+Pagecache */
int prev_priority; /* for recording reclaim priority */
/*
* statistics.
@ -709,24 +708,17 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
int ret = 0;
struct mem_cgroup *mem;
if (!mm)
mm = &init_mm;
rcu_read_lock();
mem = rcu_dereference(mm->mem_cgroup);
css_get(&mem->css);
rcu_read_unlock();
if (mem->control_type == MEM_CGROUP_TYPE_ALL)
ret = mem_cgroup_charge_common(page, mm, gfp_mask,
ret = mem_cgroup_charge_common(page, mm, gfp_mask,
MEM_CGROUP_CHARGE_TYPE_CACHE);
css_put(&mem->css);
return ret;
}
/*
* Uncharging is always a welcome operation, we never complain, simply
* uncharge.
* uncharge. This routine should be called with lock_page_cgroup held
*/
void mem_cgroup_uncharge(struct page_cgroup *pc)
{
@ -736,8 +728,7 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
unsigned long flags;
/*
* This can handle cases when a page is not charged at all and we
* are switching between handling the control_type.
* Check if our page_cgroup is valid
*/
if (!pc)
return;
@ -749,6 +740,7 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
* get page->cgroup and clear it under lock.
* force_empty can drop page->cgroup without checking refcnt.
*/
unlock_page_cgroup(page);
if (clear_page_cgroup(page, pc) == pc) {
mem = pc->mem_cgroup;
css_put(&mem->css);
@ -758,9 +750,17 @@ void mem_cgroup_uncharge(struct page_cgroup *pc)
spin_unlock_irqrestore(&mz->lru_lock, flags);
kfree(pc);
}
lock_page_cgroup(page);
}
}
void mem_cgroup_uncharge_page(struct page *page)
{
lock_page_cgroup(page);
mem_cgroup_uncharge(page_get_page_cgroup(page));
unlock_page_cgroup(page);
}
/*
* Returns non-zero if a page (under migration) has valid page_cgroup member.
* Refcnt of page_cgroup is incremented.
@ -780,8 +780,12 @@ int mem_cgroup_prepare_migration(struct page *page)
void mem_cgroup_end_migration(struct page *page)
{
struct page_cgroup *pc = page_get_page_cgroup(page);
struct page_cgroup *pc;
lock_page_cgroup(page);
pc = page_get_page_cgroup(page);
mem_cgroup_uncharge(pc);
unlock_page_cgroup(page);
}
/*
* We know both *page* and *newpage* are now not-on-LRU and Pg_locked.
@ -936,61 +940,6 @@ 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 ssize_t mem_force_empty_write(struct cgroup *cont,
struct cftype *cft, struct file *file,
const char __user *userbuf,
@ -1088,11 +1037,6 @@ 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,
},
{
.name = "force_empty",
.write = mem_force_empty_write,
@ -1161,7 +1105,6 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
res_counter_init(&mem->res);
mem->control_type = MEM_CGROUP_TYPE_ALL;
memset(&mem->info, 0, sizeof(mem->info));
for_each_node_state(node, N_POSSIBLE)