linux-kernel - Re: [RFC PATCH 0/3] Memory Controller eBPF support

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Message-ID: <aSWnPfYXRYxCDXG3@tiehlicka>
Date: Tue, 25 Nov 2025 13:55:25 +0100
From: Michal Hocko <mhocko@...e.com>
To: hui.zhu@...ux.dev
Cc: Roman Gushchin <roman.gushchin@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	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>,
	Tejun Heo <tj@...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>
Subject: Re: [RFC PATCH 0/3] Memory Controller eBPF support

On Tue 25-11-25 12:39:11, hui.zhu@...ux.dev wrote:
> My goal is implement dynamic memory reclamation for memcgs without limits,
> triggered by specific conditions.
> 
> For instance, with memcg A and memcg B both unlimited, when memcg A faces
> high PSI pressure, ebpf control memcg B do some memory reclaim work when
> it try charge.

Understood. Please also think whether this is already possible with
existing interfaces and if not what are roadblocks in that direction.

Thanks!
-- 
Michal Hocko
SUSE Labs