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

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Date: Wed, 12 Jul 2023 14:45:26 +0800
From: Abel Wu <wuyun.abel@...edance.com>
To: Jakub Kicinski <kuba@...nel.org>
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>,
 open list <linux-kernel@...r.kernel.org>,
 "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
 "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)"
 <cgroups@...r.kernel.org>,
 "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)"
 <linux-mm@...ck.org>
Subject: Re: Re: [PATCH RESEND net-next 1/2] net-memcg: Scopify the indicators
 of sockmem pressure

Hi Jakub,

On 7/12/23 11:45 AM, Jakub Kicinski wrote:
> 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?

Sure, thanks for providing this information!

Best Regards,
	Abel