netdev - Re: [PATCH v4] memcg: expose socket memory pressure in a cgroup

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Message-ID: <aKYb7_xshbtFbXjb@slm.duckdns.org>
Date: Wed, 20 Aug 2025 09:03:11 -1000
From: Tejun Heo <tj@...nel.org>
To: Matyas Hurtik <matyas.hurtik@...77.com>
Cc: Michal Koutný <mkoutny@...e.com>,
	Daniel Sedlak <daniel.sedlak@...77.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, Jonathan Corbet <corbet@....net>,
	Neal Cardwell <ncardwell@...gle.com>,
	Kuniyuki Iwashima <kuniyu@...gle.com>,
	David Ahern <dsahern@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Yosry Ahmed <yosry.ahmed@...ux.dev>, linux-mm@...ck.org,
	netdev@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>, cgroups@...r.kernel.org
Subject: Re: [PATCH v4] memcg: expose socket memory pressure in a cgroup

Hello,

On Wed, Aug 20, 2025 at 06:51:07PM +0200, Matyas Hurtik wrote:
...
> And the read side:
>   total_duration = 0;
>   for (; !mem_cgroup_is_root(memcg); memcg = parent_mem_cgroup(memcg))
>     total_duration += atomic_long_read(&memcg->socket_pressure_duration);
> Would that work?

This doesn't make sense to me. Why would a child report the numbers from its
ancestors?

Thanks.

-- 
tejun