linux-kernel - Re: [PATCH net v3 3/3] sock: Ignore memcg pressure heuristics when raising allocated

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Date:   Tue, 24 Oct 2023 00:35:18 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     Abel Wu <wuyun.abel@...edance.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v3 3/3] sock: Ignore memcg pressure heuristics when
 raising allocated

On Tue, Oct 24, 2023 at 12:08 AM Paolo Abeni <pabeni@...hat.com> wrote:
>
> On Thu, 2023-10-19 at 20:00 +0800, Abel Wu wrote:
> > Before sockets became aware of net-memcg's memory pressure since
> > commit e1aab161e013 ("socket: initial cgroup code."), the memory
> > usage would be granted to raise if below average even when under
> > protocol's pressure. This provides fairness among the sockets of
> > same protocol.
> >
> > That commit changes this because the heuristic will also be
> > effective when only memcg is under pressure which makes no sense.
> > So revert that behavior.
> >
> > After reverting, __sk_mem_raise_allocated() no longer considers
> > memcg's pressure. As memcgs are isolated from each other w.r.t.
> > memory accounting, consuming one's budget won't affect others.
> > So except the places where buffer sizes are needed to be tuned,
> > allow workloads to use the memory they are provisioned.
> >
> > Signed-off-by: Abel Wu <wuyun.abel@...edance.com>
> > Acked-by: Shakeel Butt <shakeelb@...gle.com>
> > Acked-by: Paolo Abeni <pabeni@...hat.com>
>
> It's totally not clear to me why you changed the target tree from net-
> next to net ?!? This is net-next material, I asked to strip the fixes
> tag exactly for that reason.
>
> Since there is agreement on this series and we are late in the cycle, I
> would avoid a re-post (we can apply the series to net-next anyway) but
> any clarification on the target tree change will be appreciated,
> thanks!
>

I didn't even notice the change in the target tree. I would say let's
keep this for net-next as there are no urgent fixes here.