memcg: add mem_cgroup_same_or_subtree() helper
We are checking whether a given two groups are same or at least in the same subtree of a hierarchy at several places. Let's make a helper for it to make code easier to read. Signed-off-by: Michal Hocko <mhocko@suse.cz> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <bsingharora@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:
parent
d38144b7a5
commit
3e92041d68
|
@ -1108,6 +1108,21 @@ void mem_cgroup_move_lists(struct page *page,
|
|||
mem_cgroup_add_lru_list(page, to);
|
||||
}
|
||||
|
||||
/*
|
||||
* Checks whether given mem is same or in the root_mem's
|
||||
* hierarchy subtree
|
||||
*/
|
||||
static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_mem,
|
||||
struct mem_cgroup *mem)
|
||||
{
|
||||
if (root_mem != mem) {
|
||||
return (root_mem->use_hierarchy &&
|
||||
css_is_ancestor(&mem->css, &root_mem->css));
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
|
||||
{
|
||||
int ret;
|
||||
|
@ -1127,10 +1142,7 @@ int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
|
|||
* enabled in "curr" and "curr" is a child of "mem" in *cgroup*
|
||||
* hierarchy(even if use_hierarchy is disabled in "mem").
|
||||
*/
|
||||
if (mem->use_hierarchy)
|
||||
ret = css_is_ancestor(&curr->css, &mem->css);
|
||||
else
|
||||
ret = (curr == mem);
|
||||
ret = mem_cgroup_same_or_subtree(mem, curr);
|
||||
css_put(&curr->css);
|
||||
return ret;
|
||||
}
|
||||
|
@ -1369,10 +1381,9 @@ static bool mem_cgroup_under_move(struct mem_cgroup *mem)
|
|||
to = mc.to;
|
||||
if (!from)
|
||||
goto unlock;
|
||||
if (from == mem || to == mem
|
||||
|| (mem->use_hierarchy && css_is_ancestor(&from->css, &mem->css))
|
||||
|| (mem->use_hierarchy && css_is_ancestor(&to->css, &mem->css)))
|
||||
ret = true;
|
||||
|
||||
ret = mem_cgroup_same_or_subtree(mem, from)
|
||||
|| mem_cgroup_same_or_subtree(mem, to);
|
||||
unlock:
|
||||
spin_unlock(&mc.lock);
|
||||
return ret;
|
||||
|
@ -1915,25 +1926,20 @@ struct oom_wait_info {
|
|||
static int memcg_oom_wake_function(wait_queue_t *wait,
|
||||
unsigned mode, int sync, void *arg)
|
||||
{
|
||||
struct mem_cgroup *wake_mem = (struct mem_cgroup *)arg;
|
||||
struct mem_cgroup *wake_mem = (struct mem_cgroup *)arg,
|
||||
*oom_wait_mem;
|
||||
struct oom_wait_info *oom_wait_info;
|
||||
|
||||
oom_wait_info = container_of(wait, struct oom_wait_info, wait);
|
||||
oom_wait_mem = oom_wait_info->mem;
|
||||
|
||||
if (oom_wait_info->mem == wake_mem)
|
||||
goto wakeup;
|
||||
/* if no hierarchy, no match */
|
||||
if (!oom_wait_info->mem->use_hierarchy || !wake_mem->use_hierarchy)
|
||||
return 0;
|
||||
/*
|
||||
* Both of oom_wait_info->mem and wake_mem are stable under us.
|
||||
* Then we can use css_is_ancestor without taking care of RCU.
|
||||
*/
|
||||
if (!css_is_ancestor(&oom_wait_info->mem->css, &wake_mem->css) &&
|
||||
!css_is_ancestor(&wake_mem->css, &oom_wait_info->mem->css))
|
||||
if (!mem_cgroup_same_or_subtree(oom_wait_mem, wake_mem)
|
||||
&& !mem_cgroup_same_or_subtree(wake_mem, oom_wait_mem))
|
||||
return 0;
|
||||
|
||||
wakeup:
|
||||
return autoremove_wake_function(wait, mode, sync, arg);
|
||||
}
|
||||
|
||||
|
@ -2178,13 +2184,8 @@ static void drain_all_stock(struct mem_cgroup *root_mem, bool sync)
|
|||
mem = stock->cached;
|
||||
if (!mem || !stock->nr_pages)
|
||||
continue;
|
||||
if (mem != root_mem) {
|
||||
if (!root_mem->use_hierarchy)
|
||||
if (!mem_cgroup_same_or_subtree(root_mem, mem))
|
||||
continue;
|
||||
/* check whether "mem" is under tree of "root_mem" */
|
||||
if (!css_is_ancestor(&mem->css, &root_mem->css))
|
||||
continue;
|
||||
}
|
||||
if (!test_and_set_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) {
|
||||
if (cpu == curcpu)
|
||||
drain_local_stock(&stock->work);
|
||||
|
|
Loading…
Reference in a new issue