netdev - Re: [PATCH bpf-next v3 00/13] bpf: Introduce selectable memcg for bpf map

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Message-ID: <Yxi8I4fXXSCi6z9T@slm.duckdns.org>
Date:   Wed, 7 Sep 2022 05:43:31 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
        haoluo@...gle.com, jolsa@...nel.org, hannes@...xchg.org,
        mhocko@...nel.org, roman.gushchin@...ux.dev, shakeelb@...gle.com,
        songmuchun@...edance.com, akpm@...ux-foundation.org,
        lizefan.x@...edance.com, cgroups@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH bpf-next v3 00/13] bpf: Introduce selectable memcg for
 bpf map

Hello,

On Fri, Sep 02, 2022 at 02:29:50AM +0000, Yafang Shao wrote:
...
> This patchset tries to resolve the above two issues by introducing a
> selectable memcg to limit the bpf memory. Currently we only allow to
> select its ancestor to avoid breaking the memcg hierarchy further. 
> Possible use cases of the selectable memcg as follows,

As discussed in the following thread, there are clear downsides to an
interface which requires the users to specify the cgroups directly.

 https://lkml.kernel.org/r/YwNold0GMOappUxc@slm.duckdns.org

So, I don't really think this is an interface we wanna go for. I was hoping
to hear more from memcg folks in the above thread. Maybe ping them in that
thread and continue there?

Thanks.

-- 
tejun