Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3c541e14bfa553133c3473a6ed3e4c0583ea2285
Commit: 3c541e14bfa553133c3473a6ed3e4c0583ea2285
Parent: 072c56c13e1302fcdc39961dc64e76485731ad67
Author: Balbir Singh <[EMAIL PROTECTED]>
AuthorDate: Thu Feb 7 00:14:41 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Thu Feb 7 08:42:22 2008 -0800
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 <[EMAIL PROTECTED]>
Acked-by: KAMEZAWA Hiroyuki <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
include/linux/memcontrol.h | 6 +--
mm/memcontrol.c | 91 ++++++++-----------------------------------
2 files changed, 18 insertions(+), 79 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d87090e..9815951 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -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);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 315dee1..5c2c702 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -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,
@@ -1089,11 +1038,6 @@ static struct cftype mem_cgroup_files[] = {
.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,
.read = mem_force_empty_read,
@@ -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)
-
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