diff mbox series

[v8,10/10] mm/memcg: add debug checking in lock_page_memcg

Message ID 1579143909-156105-11-git-send-email-alex.shi@linux.alibaba.com (mailing list archive)
State New, archived
Headers show
Series per lruvec lru_lock for memcg | expand

Commit Message

Alex Shi Jan. 16, 2020, 3:05 a.m. UTC 
This extra irq disable/enable and BUG_ON checking costs 5% readtwice
performance on a 2 socket * 26 cores * HT box. So put it into
CONFIG_PROVE_LOCKING.

Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
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 mbox series

Patch

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a567fd868739..4ad1b4d2eb1e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2029,6 +2029,12 @@  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;