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authorJohannes Weiner <hannes@cmpxchg.org>2014-12-10 15:44:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-10 17:41:08 -0800
commit2314b42db67be30b747122d65c6cd2c85da34538 (patch)
tree5dffdf758736c83b6bfe8b6ada0dbb99d992c0f5
parent413918bb61b4fa027baa3e79546c47f15e4b9ea8 (diff)
downloadop-kernel-dev-2314b42db67be30b747122d65c6cd2c85da34538.zip
op-kernel-dev-2314b42db67be30b747122d65c6cd2c85da34538.tar.gz
mm: memcontrol: drop bogus RCU locking from mem_cgroup_same_or_subtree()
None of the mem_cgroup_same_or_subtree() callers actually require it to take the RCU lock, either because they hold it themselves or they have css references. Remove it. To make the API change clear, rename the leftover helper to mem_cgroup_is_descendant() to match cgroup_is_descendant(). Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Vladimir Davydov <vdavydov@parallels.com> Acked-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/memcontrol.h13
-rw-r--r--mm/memcontrol.c59
-rw-r--r--mm/oom_kill.c4
3 files changed, 24 insertions, 52 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index e32ab94..d4575a1 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -68,10 +68,9 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
-bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
- struct mem_cgroup *memcg);
-bool task_in_mem_cgroup(struct task_struct *task,
- const struct mem_cgroup *memcg);
+bool mem_cgroup_is_descendant(struct mem_cgroup *memcg,
+ struct mem_cgroup *root);
+bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg);
extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);
extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
@@ -79,8 +78,8 @@ extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
extern struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg);
extern struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css);
-static inline
-bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg)
+static inline bool mm_match_cgroup(struct mm_struct *mm,
+ struct mem_cgroup *memcg)
{
struct mem_cgroup *task_memcg;
bool match = false;
@@ -88,7 +87,7 @@ bool mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *memcg)
rcu_read_lock();
task_memcg = mem_cgroup_from_task(rcu_dereference(mm->owner));
if (task_memcg)
- match = __mem_cgroup_same_or_subtree(memcg, task_memcg);
+ match = mem_cgroup_is_descendant(task_memcg, memcg);
rcu_read_unlock();
return match;
}
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e5dcebd..b841bf4 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1328,41 +1328,24 @@ void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
VM_BUG_ON((long)(*lru_size) < 0);
}
-/*
- * Checks whether given mem is same or in the root_mem_cgroup's
- * hierarchy subtree
- */
-bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
- struct mem_cgroup *memcg)
+bool mem_cgroup_is_descendant(struct mem_cgroup *memcg, struct mem_cgroup *root)
{
- if (root_memcg == memcg)
+ if (root == memcg)
return true;
- if (!root_memcg->use_hierarchy)
+ if (!root->use_hierarchy)
return false;
- return cgroup_is_descendant(memcg->css.cgroup, root_memcg->css.cgroup);
-}
-
-static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
- struct mem_cgroup *memcg)
-{
- bool ret;
-
- rcu_read_lock();
- ret = __mem_cgroup_same_or_subtree(root_memcg, memcg);
- rcu_read_unlock();
- return ret;
+ return cgroup_is_descendant(memcg->css.cgroup, root->css.cgroup);
}
-bool task_in_mem_cgroup(struct task_struct *task,
- const struct mem_cgroup *memcg)
+bool task_in_mem_cgroup(struct task_struct *task, struct mem_cgroup *memcg)
{
- struct mem_cgroup *curr;
+ struct mem_cgroup *task_memcg;
struct task_struct *p;
bool ret;
p = find_lock_task_mm(task);
if (p) {
- curr = get_mem_cgroup_from_mm(p->mm);
+ task_memcg = get_mem_cgroup_from_mm(p->mm);
task_unlock(p);
} else {
/*
@@ -1371,18 +1354,12 @@ bool task_in_mem_cgroup(struct task_struct *task,
* killed to prevent needlessly killing additional tasks.
*/
rcu_read_lock();
- curr = mem_cgroup_from_task(task);
- css_get(&curr->css);
+ task_memcg = mem_cgroup_from_task(task);
+ css_get(&task_memcg->css);
rcu_read_unlock();
}
- /*
- * We should check use_hierarchy of "memcg" not "curr". Because checking
- * use_hierarchy of "curr" here make this function true if hierarchy is
- * enabled in "curr" and "curr" is a child of "memcg" in *cgroup*
- * hierarchy(even if use_hierarchy is disabled in "memcg").
- */
- ret = mem_cgroup_same_or_subtree(memcg, curr);
- css_put(&curr->css);
+ ret = mem_cgroup_is_descendant(task_memcg, memcg);
+ css_put(&task_memcg->css);
return ret;
}
@@ -1467,8 +1444,8 @@ static bool mem_cgroup_under_move(struct mem_cgroup *memcg)
if (!from)
goto unlock;
- ret = mem_cgroup_same_or_subtree(memcg, from)
- || mem_cgroup_same_or_subtree(memcg, to);
+ ret = mem_cgroup_is_descendant(from, memcg) ||
+ mem_cgroup_is_descendant(to, memcg);
unlock:
spin_unlock(&mc.lock);
return ret;
@@ -1900,12 +1877,8 @@ static int memcg_oom_wake_function(wait_queue_t *wait,
oom_wait_info = container_of(wait, struct oom_wait_info, wait);
oom_wait_memcg = oom_wait_info->memcg;
- /*
- * Both of oom_wait_info->memcg and wake_memcg are stable under us.
- * Then we can use css_is_ancestor without taking care of RCU.
- */
- if (!mem_cgroup_same_or_subtree(oom_wait_memcg, wake_memcg)
- && !mem_cgroup_same_or_subtree(wake_memcg, oom_wait_memcg))
+ if (!mem_cgroup_is_descendant(wake_memcg, oom_wait_memcg) &&
+ !mem_cgroup_is_descendant(oom_wait_memcg, wake_memcg))
return 0;
return autoremove_wake_function(wait, mode, sync, arg);
}
@@ -2225,7 +2198,7 @@ static void drain_all_stock(struct mem_cgroup *root_memcg)
memcg = stock->cached;
if (!memcg || !stock->nr_pages)
continue;
- if (!mem_cgroup_same_or_subtree(root_memcg, memcg))
+ if (!mem_cgroup_is_descendant(memcg, root_memcg))
continue;
if (!test_and_set_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) {
if (cpu == curcpu)
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 5340f6b..3b014d3 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -119,7 +119,7 @@ found:
/* return true if the task is not adequate as candidate victim task. */
static bool oom_unkillable_task(struct task_struct *p,
- const struct mem_cgroup *memcg, const nodemask_t *nodemask)
+ struct mem_cgroup *memcg, const nodemask_t *nodemask)
{
if (is_global_init(p))
return true;
@@ -353,7 +353,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
* State information includes task's pid, uid, tgid, vm size, rss, nr_ptes,
* swapents, oom_score_adj value, and name.
*/
-static void dump_tasks(const struct mem_cgroup *memcg, const nodemask_t *nodemask)
+static void dump_tasks(struct mem_cgroup *memcg, const nodemask_t *nodemask)
{
struct task_struct *p;
struct task_struct *task;
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