linux-kernel - [PATCH] mm: memcontrol: Set the correct memcg swappiness restriction

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Message-Id: <d77469b90c45c49953ccbc51e54a1d465bc18f70.1627626255.git.baolin.wang@linux.alibaba.com>
Date:   Fri, 30 Jul 2021 14:26:35 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     akpm@...ux-foundation.org, hannes@...xchg.org, mhocko@...nel.org,
        vdavydov.dev@...il.com
Cc:     baolin.wang@...ux.alibaba.com, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: memcontrol: Set the correct memcg swappiness restriction

Since commit c843966c556d ("mm: allow swappiness that prefers reclaiming
anon over the file workingset") has expended the swappiness value to
make swap to be preferred in some systems. We should also change the
memcg swappiness restriction to allow memcg swap-preferred.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/memcontrol.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6580c23..988fc94 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4046,7 +4046,7 @@ static int mem_cgroup_swappiness_write(struct cgroup_subsys_state *css,
 {
 	struct mem_cgroup *memcg = mem_cgroup_from_css(css);
 
-	if (val > 100)
+	if (val > 200)
 		return -EINVAL;
 
 	if (!mem_cgroup_is_root(memcg))
-- 
1.8.3.1