linux-kernel - Re: [PATCH] mm-vmscan-dont-mess-with-pgdat-flags-in-memcg-reclaim-v2-fix

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Date:   Fri, 6 Apr 2018 12:36:05 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tejun Heo <tj@...nel.org>, Michal Hocko <mhocko@...nel.org>,
        Linux MM <linux-mm@...ck.org>, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org
Subject: Re: [PATCH]
 mm-vmscan-dont-mess-with-pgdat-flags-in-memcg-reclaim-v2-fix

On Fri, Apr 06, 2018 at 04:52:15PM +0300, Andrey Ryabinin wrote:
> On 04/06/2018 05:13 AM, Shakeel Butt wrote:
> > Question: Should this 'flags' be per-node? Is it ok for a congested
> > memcg to call wait_iff_congested for all nodes?
> 
> Indeed, congestion state should be pre-node. If memcg on node A is
> congested, there is no point is stalling memcg reclaim from node B.
> 
> Make congestion state per-cgroup-per-node and record it in
> 'struct mem_cgroup_per_node'.
> 
> Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>

Thanks for fixing this, Andrey. This is great.

For the combined patch and this fix:

Acked-by: Johannes Weiner <hannes@...xchg.org>