From: Michal Hocko <mhocko@suse.com>
To: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Shakeel Butt <shakeel.butt@linux.dev>,
Johannes Weiner <hannes@cmpxchg.org>,
Andrii Nakryiko <andrii@kernel.org>,
JP Kobryn <inwardvessel@gmail.com>,
linux-mm@kvack.org, cgroups@vger.kernel.org, bpf@vger.kernel.org,
Martin KaFai Lau <martin.lau@kernel.org>,
Song Liu <song@kernel.org>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>,
Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH v2 23/23] bpf: selftests: PSI struct ops test
Date: Mon, 10 Nov 2025 10:48:49 +0100 [thread overview]
Message-ID: <aRG1AX0tQjAJU6lT@tiehlicka> (raw)
In-Reply-To: <20251027232206.473085-13-roman.gushchin@linux.dev>
On Mon 27-10-25 16:22:06, Roman Gushchin wrote:
> Add a PSI struct ops test.
>
> The test creates a cgroup with two child sub-cgroups, sets up
> memory.high for one of those and puts there a memory hungry
> process (initially frozen).
>
> Then it creates 2 PSI triggers from within a init() BPF callback and
> attaches them to these cgroups. Then it deletes the first cgroup,
> creates another one and runs the memory hungry task. From the cgroup
> creation callback the test is creating another trigger.
>
> The memory hungry task is creating a high memory pressure in one
> memory cgroup, which triggers a PSI event. The PSI BPF handler
> declares a memcg oom in the corresponding cgroup. Finally the checks
> that both handle_cgroup_free() and handle_psi_event() handlers were
> executed, the correct process was killed and oom counters were
> updated.
I might be just dense but what is behind that deleted cgroup
(deleted_cgroup_id etc) dance?
--
Michal Hocko
SUSE Labs
prev parent reply other threads:[~2025-11-10 9:48 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-10-27 23:21 [PATCH v2 11/23] mm: introduce BPF kfunc to access memory events Roman Gushchin
2025-10-27 23:21 ` [PATCH v2 12/23] bpf: selftests: selftests for memcg stat kfuncs Roman Gushchin
2025-10-27 23:21 ` [PATCH v2 13/23] mm: introduce bpf_out_of_memory() BPF kfunc Roman Gushchin
2025-10-27 23:57 ` bot+bpf-ci
2025-10-28 16:43 ` Roman Gushchin
2025-11-10 9:46 ` Michal Hocko
2025-10-27 23:21 ` [PATCH v2 14/23] mm: allow specifying custom oom constraint for BPF triggers Roman Gushchin
2025-10-27 23:48 ` bot+bpf-ci
2025-10-28 15:58 ` Chris Mason
2025-10-28 16:20 ` Roman Gushchin
2025-10-28 16:35 ` Chris Mason
2025-11-10 9:31 ` Michal Hocko
2025-10-27 23:21 ` [PATCH v2 15/23] mm: introduce bpf_task_is_oom_victim() kfunc Roman Gushchin
2025-10-28 17:32 ` Tejun Heo
2025-10-28 18:09 ` Roman Gushchin
2025-10-28 18:31 ` Tejun Heo
2025-10-27 23:21 ` [PATCH v2 16/23] libbpf: introduce bpf_map__attach_struct_ops_opts() Roman Gushchin
2025-10-27 23:48 ` bot+bpf-ci
2025-10-28 17:07 ` Roman Gushchin
2025-10-28 17:24 ` Andrii Nakryiko
2025-10-27 23:22 ` [PATCH v2 17/23] bpf: selftests: introduce read_cgroup_file() helper Roman Gushchin
2025-10-27 23:48 ` bot+bpf-ci
2025-10-28 16:31 ` Roman Gushchin
2025-10-27 23:22 ` [PATCH v2 18/23] bpf: selftests: BPF OOM handler test Roman Gushchin
2025-10-27 23:22 ` [PATCH v2 19/23] sched: psi: refactor psi_trigger_create() Roman Gushchin
2025-10-27 23:22 ` [PATCH v2 20/23] sched: psi: implement bpf_psi struct ops Roman Gushchin
2025-10-27 23:48 ` bot+bpf-ci
2025-10-28 17:40 ` Tejun Heo
2025-10-28 18:29 ` Roman Gushchin
2025-10-28 18:35 ` Tejun Heo
2025-10-28 19:54 ` Roman Gushchin
2025-10-27 23:22 ` [PATCH v2 21/23] sched: psi: implement bpf_psi_create_trigger() kfunc Roman Gushchin
2025-10-27 23:22 ` [PATCH v2 22/23] bpf: selftests: add config for psi Roman Gushchin
2025-10-27 23:22 ` [PATCH v2 23/23] bpf: selftests: PSI struct ops test Roman Gushchin
2025-10-27 23:48 ` bot+bpf-ci
2025-10-28 17:13 ` Roman Gushchin
2025-10-28 17:30 ` Alexei Starovoitov
2025-11-10 9:48 ` Michal Hocko [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aRG1AX0tQjAJU6lT@tiehlicka \
--to=mhocko@suse.com \
--cc=akpm@linux-foundation.org \
--cc=andrii@kernel.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=cgroups@vger.kernel.org \
--cc=hannes@cmpxchg.org \
--cc=inwardvessel@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=martin.lau@kernel.org \
--cc=memxor@gmail.com \
--cc=roman.gushchin@linux.dev \
--cc=shakeel.butt@linux.dev \
--cc=song@kernel.org \
--cc=surenb@google.com \
--cc=tj@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).