linux-kernel - Re: [RFC PATCH 1/3] memcg: add eBPF struct ops support for memory charging

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <aR3rMWgTWHryaZ6n@slm.duckdns.org>
Date: Wed, 19 Nov 2025 06:07:13 -1000
From: Tejun Heo <tj@...nel.org>
To: Hui Zhu <hui.zhu@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>, Kees Cook <kees@...nel.org>,
	Jeff Xu <jeffxu@...omium.org>, mkoutny@...e.com,
	Jan Hendrik Farr <kernel@...rr.cc>,
	Christian Brauner <brauner@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Brian Gerst <brgerst@...il.com>,
	Masahiro Yamada <masahiroy@...nel.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	cgroups@...r.kernel.org, bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org, Hui Zhu <zhuhui@...inos.cn>,
	Geliang Tang <geliang@...nel.org>
Subject: Re: [RFC PATCH 1/3] memcg: add eBPF struct ops support for memory
 charging

Hello, Hui.

On Wed, Nov 19, 2025 at 09:34:06AM +0800, Hui Zhu wrote:
> Handlers can inspect this context and modify certain fields
> (e.g., nr_pages) to adjust reclamation behavior. The design
> enforces single active handler to avoid conflicts.

Other folks would know a lot better how this should hook into memcg, but
given that this is a cgroup feature, this should allow hierarchical
delegation. It probably would be a good idea to aling it with the bpf OOM
handler support that Roman is working on.

Thanks.

-- 
tejun