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From: Michal Hocko <mhocko@suse.com>
To: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: akpm@linux-foundation.org, hannes@cmpxchg.org,
	vdavydov.dev@gmail.com, cgroups@vger.kernel.org,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: memcontrol: Set the correct memcg swappiness restriction
Date: Fri, 30 Jul 2021 08:39:13 +0200	[thread overview]
Message-ID: <YQOekWWgtZUfim4M@dhcp22.suse.cz> (raw)
In-Reply-To: <d77469b90c45c49953ccbc51e54a1d465bc18f70.1627626255.git.baolin.wang@linux.alibaba.com>

On Fri 30-07-21 14:26:35, Baolin Wang wrote:
> 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@linux.alibaba.com>

Yes, this looks like an omission. It doesn't really make sense to have
two different constrains on the value.

Acked-by: Michal Hocko <mhocko@suse.com>

Thanks!

> ---
>  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

-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2021-07-30  6:39 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30  6:26 Baolin Wang
2021-07-30  6:39 ` Michal Hocko [this message]
2021-08-03 15:20   ` Vlastimil Babka
2021-08-03 15:45     ` Baolin Wang
2021-08-03 20:25       ` Andrew Morton

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