linux-kernel - Re: [PATCH V4 2/2] mm: add swapiness= arg to memory.reclaim

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Message-ID: <ZXneCaeJjHvFvecK@dschatzberg-fedora-PF3DHTBV>
Date:   Wed, 13 Dec 2023 11:38:33 -0500
From:   Dan Schatzberg <schatzberg.dan@...il.com>
To:     Yu Zhao <yuzhao@...gle.com>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Yosry Ahmed <yosryahmed@...gle.com>, Huan Yang <link@...o.com>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, Tejun Heo <tj@...nel.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Jonathan Corbet <corbet@....net>,
        Michal Hocko <mhocko@...nel.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Muchun Song <muchun.song@...ux.dev>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Yue Zhao <findns94@...il.com>, Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH V4 2/2] mm: add swapiness= arg to memory.reclaim

On Tue, Dec 12, 2023 at 07:05:36PM -0700, Yu Zhao wrote:
> On Tue, Dec 12, 2023 at 6:39 PM Dan Schatzberg <schatzberg.dan@...il.com> wrote:
> >
> > Allow proactive reclaimers to submit an additional swappiness=<val>
> > argument to memory.reclaim. This overrides the global or per-memcg
> > swappiness setting for that reclaim attempt.
> >
> > For example:
> >
> > echo "2M swappiness=0" > /sys/fs/cgroup/memory.reclaim
> >
> > will perform reclaim on the rootcg with a swappiness setting of 0 (no
> > swap) regardless of the vm.swappiness sysctl setting.
> >
> > Signed-off-by: Dan Schatzberg <schatzberg.dan@...il.com>
> 
> NAK.
> 
> Please initialize new variables properly and test code changes
> thoroughly before submission.

Could you be a bit more specific? The patch is compiling and working
locally but perhaps there's some configuration or behavior that I
haven't been testing.