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Date:   Tue, 11 Jul 2023 20:45:37 -0700
From:   Jakub Kicinski <kuba@kernel.org>
To:     Abel Wu <wuyun.abel@bytedance.com>
Cc:     "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Paolo Abeni <pabeni@redhat.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Michal Hocko <mhocko@kernel.org>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Shakeel Butt <shakeelb@google.com>,
        Muchun Song <muchun.song@linux.dev>,
        Andrew Morton <akpm@linux-foundation.org>,
        David Ahern <dsahern@kernel.org>,
        Yosry Ahmed <yosryahmed@google.com>,
        "Matthew Wilcox (Oracle)" <willy@infradead.org>,
        Yu Zhao <yuzhao@google.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        Yafang Shao <laoar.shao@gmail.com>,
        Kuniyuki Iwashima <kuniyu@amazon.com>,
        Martin KaFai Lau <martin.lau@kernel.org>,
        Alexander Mikhalitsyn <alexander@mihalicyn.com>,
        Breno Leitao <leitao@debian.org>,
        David Howells <dhowells@redhat.com>,
        Jason Xing <kernelxing@tencent.com>,
        Xin Long <lucien.xin@gmail.com>,
        Michal Hocko <mhocko@suse.com>,
        Alexei Starovoitov <ast@kernel.org>,
        linux-kernel@vger.kernel.org (open list),
        netdev@vger.kernel.org (open list:NETWORKING [GENERAL]),
        cgroups@vger.kernel.org (open list:CONTROL GROUP - MEMORY RESOURCE
        CONTROLLER (MEMCG)),
        linux-mm@kvack.org (open list:CONTROL GROUP - MEMORY RESOURCE
        CONTROLLER (MEMCG))
Subject: Re: [PATCH RESEND net-next 1/2] net-memcg: Scopify the indicators
 of sockmem pressure
Message-ID: <20230711204537.04cb1124@kernel.org>
In-Reply-To: <20230711124157.97169-1-wuyun.abel@bytedance.com>
References: <20230711124157.97169-1-wuyun.abel@bytedance.com>
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On Tue, 11 Jul 2023 20:41:43 +0800 Abel Wu wrote:
> Now there are two indicators of socket memory pressure sit inside
> struct mem_cgroup, socket_pressure and tcpmem_pressure.
> 
> When in legacy mode aka. cgroupv1, the socket memory is charged
> into a separate counter memcg->tcpmem rather than ->memory, so
> the reclaim pressure of the memcg has nothing to do with socket's
> pressure at all. While for default mode, the ->tcpmem is simply
> not used.
> 
> So {socket,tcpmem}_pressure are only used in default/legacy mode
> respectively. This patch fixes the pieces of code that make mixed
> use of both.

Eric Dumazet is currently AFK, can we wait for him to return 
(in about a week) before merging?