linux-kernel - Re: [PATCH v5 1/2] mm: vmscan: ignore non-LRU-based reclaim in memcg reclaim

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Message-Id: <20230406152519.b57c4fb4da75e0b5142de2b0@linux-foundation.org>
Date:   Thu, 6 Apr 2023 15:25:19 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     Yosry Ahmed <yosryahmed@...gle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Xu <peterx@...hat.com>, NeilBrown <neilb@...e.de>,
        Shakeel Butt <shakeelb@...gle.com>,
        Michal Hocko <mhocko@...nel.org>, Yu Zhao <yuzhao@...gle.com>,
        Dave Chinner <david@...morbit.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-mm@...ck.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v5 1/2] mm: vmscan: ignore non-LRU-based reclaim in
 memcg reclaim

On Thu, 6 Apr 2023 12:30:56 +0200 David Hildenbrand <david@...hat.com> wrote:

> Otherwise it's hard to judge how far to backport this.

The case for backporting sounded rather unconvincing to me, which is
why I'm still sitting on the v4 series.

What are your thoughts on the desirability of a backport?

It makes sense to design the forthcoming v6 series for backportability,
so that even if we decide "no", others can still take it easily if they
wish to.