netdev - Re: [PATCH RESEND net-next 1/2] net-memcg: Scopify the indicators of sockmem pressure

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Date: Tue, 11 Jul 2023 20:45:37 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Abel Wu <wuyun.abel@...edance.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Johannes Weiner
 <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>, Roman Gushchin
 <roman.gushchin@...ux.dev>, Shakeel Butt <shakeelb@...gle.com>, Muchun Song
 <muchun.song@...ux.dev>, Andrew Morton <akpm@...ux-foundation.org>, David
 Ahern <dsahern@...nel.org>, Yosry Ahmed <yosryahmed@...gle.com>, "Matthew
 Wilcox (Oracle)" <willy@...radead.org>, Yu Zhao <yuzhao@...gle.com>, Kefeng
 Wang <wangkefeng.wang@...wei.com>, Yafang Shao <laoar.shao@...il.com>,
 Kuniyuki Iwashima <kuniyu@...zon.com>, Martin KaFai Lau
 <martin.lau@...nel.org>, Alexander Mikhalitsyn <alexander@...alicyn.com>,
 Breno Leitao <leitao@...ian.org>, David Howells <dhowells@...hat.com>,
 Jason Xing <kernelxing@...cent.com>, Xin Long <lucien.xin@...il.com>,
 Michal Hocko <mhocko@...e.com>, Alexei Starovoitov <ast@...nel.org>,
 linux-kernel@...r.kernel.org (open list), netdev@...r.kernel.org (open
 list:NETWORKING [GENERAL]), cgroups@...r.kernel.org (open list:CONTROL
 GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)), linux-mm@...ck.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

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?