[PATCH v14 08/20] mm/memcg: add debug checking in lock_page_memcg
From: Alex Shi <hidden>
Date: 2020-07-03 05:08:57
Also in:
linux-mm, lkml
Subsystem:
control group - memory resource controller (memcg), memory management, the rest · Maintainers:
Johannes Weiner, Michal Hocko, Roman Gushchin, Shakeel Butt, Andrew Morton, Linus Torvalds
Add a debug checking in lock_page_memcg, then we could get alarm if anything wrong here. Suggested-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Alex Shi <redacted> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vladimir Davydov <redacted> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: cgroups@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- mm/memcontrol.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 19622328e4b5..fde47272b13c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c@@ -1983,6 +1983,12 @@ struct mem_cgroup *lock_page_memcg(struct page *page) if (unlikely(!memcg)) return NULL; +#ifdef CONFIG_PROVE_LOCKING + local_irq_save(flags); + might_lock(&memcg->move_lock); + local_irq_restore(flags); +#endif + if (atomic_read(&memcg->moving_account) <= 0) return memcg;
--
1.8.3.1