From: Alex Shi <alex.shi@linux.alibaba.com>
To: akpm@linux-foundation.org, hannes@cmpxchg.org, lkp@intel.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org
Cc: Michal Hocko <mhocko@kernel.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>
Subject: [PATCH 1/2] mm/memcg: bail early from swap accounting if memcg disabled
Date: Mon, 2 Nov 2020 10:17:15 +0800 [thread overview]
Message-ID: <1604283436-18880-2-git-send-email-alex.shi@linux.alibaba.com> (raw)
In-Reply-To: <1604283436-18880-1-git-send-email-alex.shi@linux.alibaba.com>
We could bail out early when memcg wasn't enabled.
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Reviewed-by: Roman Gushchin <guro@fb.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
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 --git a/mm/memcontrol.c b/mm/memcontrol.c
index 3a24e3b619f5..ec13fe4ed407 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -7172,6 +7172,9 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
VM_BUG_ON_PAGE(PageLRU(page), page);
VM_BUG_ON_PAGE(page_count(page), page);
+ if (mem_cgroup_disabled())
+ return;
+
if (cgroup_subsys_on_dfl(memory_cgrp_subsys))
return;
@@ -7236,6 +7239,9 @@ int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry)
struct mem_cgroup *memcg;
unsigned short oldid;
+ if (mem_cgroup_disabled())
+ return 0;
+
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
return 0;
--
1.8.3.1
next prev parent reply other threads:[~2020-11-02 2:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-02 2:17 [PATCH 0/2] bail out early for memcg disable Alex Shi
2020-11-02 2:17 ` Alex Shi [this message]
2020-11-02 2:17 ` [PATCH 2/2] mm/memcg: warning on !memcg after readahead page charged Alex Shi
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