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.

Link: https://lkml.kernel.org/r/d77469b90c45c49953ccbc51e54a1d465bc18f70.1627626255.git.baolin.wang@linux.alibaba.com
Fixes: c843966c556d ("mm: allow swappiness that prefers reclaiming anon over the file workingset")
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b09f2639f28b1c25a3e2178c495c7bf2d337afd4..80840e026c2f783216bbdbd090d7e37694d2f9e2 100644 (file)
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4062,7 +4062,7 @@ 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))