linux-kernel - Re: [PATCH] mm: memcontrol: drain stocks on resize limit

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Date:   Wed, 9 May 2018 09:45:08 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Greg Thelen <gthelen@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Linux MM <linux-mm@...ck.org>,
        Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: memcontrol: drain stocks on resize limit

On Fri 04-05-18 13:55:48, Shakeel Butt wrote:
> Resizing the memcg limit for cgroup-v2 drains the stocks before
> triggering the memcg reclaim. Do the same for cgroup-v1 to make the
> behavior consistent.
> 
> Signed-off-by: Shakeel Butt <shakeelb@...gle.com>

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

> ---
>  mm/memcontrol.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 25b148c2d222..e2d33a37f971 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2463,6 +2463,7 @@ static int mem_cgroup_resize_max(struct mem_cgroup *memcg,
>  				 unsigned long max, bool memsw)
>  {
>  	bool enlarge = false;
> +	bool drained = false;
>  	int ret;
>  	bool limits_invariant;
>  	struct page_counter *counter = memsw ? &memcg->memsw : &memcg->memory;
> @@ -2493,6 +2494,12 @@ static int mem_cgroup_resize_max(struct mem_cgroup *memcg,
>  		if (!ret)
>  			break;
>  
> +		if (!drained) {
> +			drain_all_stock(memcg);
> +			drained = true;
> +			continue;
> +		}
> +
>  		if (!try_to_free_mem_cgroup_pages(memcg, 1,
>  					GFP_KERNEL, !memsw)) {
>  			ret = -EBUSY;
> -- 
> 2.17.0.441.gb46fe60e1d-goog

-- 
Michal Hocko
SUSE Labs