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memcg: add memcg sanity checks at allocating and freeing pages

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Add checks at allocating or freeing a page whether the page is used (iow,
charged) from the view point of memcg.

This check may be useful in debugging a problem and we did similar checks
before the commit 52d4b9ac(memcg: allocate all page_cgroup at boot).

This patch adds some overheads at allocating or freeing memory, so it's
enabled only when CONFIG_DEBUG_VM is enabled.

Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daisuke Nishimura
2011-03-23 16:42:25 -07:00
committed by Linus Torvalds
parent af4a662144
commit f212ad7cf9
3 changed files with 69 additions and 2 deletions
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46
mm/memcontrol.c
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@@ -3046,6 +3046,52 @@ int mem_cgroup_shmem_charge_fallback(struct page *page,
return ret;
}
#ifdef CONFIG_DEBUG_VM
static struct page_cgroup *lookup_page_cgroup_used(struct page *page)
{
struct page_cgroup *pc;
pc = lookup_page_cgroup(page);
if (likely(pc) && PageCgroupUsed(pc))
return pc;
return NULL;
}
bool mem_cgroup_bad_page_check(struct page *page)
{
if (mem_cgroup_disabled())
return false;
return lookup_page_cgroup_used(page) != NULL;
}
void mem_cgroup_print_bad_page(struct page *page)
{
struct page_cgroup *pc;
pc = lookup_page_cgroup_used(page);
if (pc) {
int ret = -1;
char *path;
printk(KERN_ALERT "pc:%p pc->flags:%lx pc->mem_cgroup:%p",
pc, pc->flags, pc->mem_cgroup);
path = kmalloc(PATH_MAX, GFP_KERNEL);
if (path) {
rcu_read_lock();
ret = cgroup_path(pc->mem_cgroup->css.cgroup,
path, PATH_MAX);
rcu_read_unlock();
}
printk(KERN_CONT "(%s)\n",
(ret < 0) ? "cannot get the path" : path);
kfree(path);
}
}
#endif
static DEFINE_MUTEX(set_limit_mutex);
static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,