From: Roman Gushchin <roman.gushchin@linux.dev>
To: Suren Baghdasaryan <surenb@google.com>
Cc: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Alexei Starovoitov <ast@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Shakeel Butt <shakeel.butt@linux.dev>,
David Rientjes <rientjes@google.com>,
Josh Don <joshdon@google.com>,
Chuyi Zhou <zhouchuyi@bytedance.com>,
cgroups@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org
Subject: Re: [PATCH rfc 09/12] sched: psi: bpf hook to handle psi events
Date: Wed, 30 Apr 2025 00:58:24 +0000 [thread overview]
Message-ID: <aBF1sPtO_UbE1fYo@google.com> (raw)
In-Reply-To: <CAJuCfpEdyZWac7diTUYV7JjkpAPDuy9hwT5sfE2AC2zDVPA9ZA@mail.gmail.com>
On Tue, Apr 29, 2025 at 05:28:59PM -0700, Suren Baghdasaryan wrote:
> On Sun, Apr 27, 2025 at 8:37 PM Roman Gushchin <roman.gushchin@linux.dev> wrote:
> >
> > Introduce a bpf hook to handle psi events. The primary intended
> > purpose of this hook is to declare OOM events based on the reaching
> > a certain memory pressure level, similar to what systemd-oomd and oomd
> > are doing in userspace.
>
> It's a bit awkward that this requires additional userspace action to
> create PSI triggers. I have almost no experience with BPF, so this
> might be a stupid question, but maybe we could provide a bpf kfunc for
> the BPF handler to register its PSI trigger(s) upon handler
> registration?
It looks like it's doable using struct_ops path: the .init callback
can create psi triggers and "attach" them to the loaded bpf program.
But I need to figure out the details.
Good point, thank you!
next prev parent reply other threads:[~2025-04-30 0:58 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-28 3:36 [PATCH rfc 00/12] mm: BPF OOM Roman Gushchin
2025-04-28 3:36 ` [PATCH rfc 01/12] mm: introduce a bpf hook for OOM handling Roman Gushchin
2025-04-28 3:36 ` [PATCH rfc 02/12] bpf: mark struct oom_control's memcg field as TRUSTED_OR_NULL Roman Gushchin
2025-04-28 3:36 ` [PATCH rfc 03/12] bpf: treat fmodret tracing program's arguments as trusted Roman Gushchin
2025-04-28 3:36 ` [PATCH rfc 04/12] mm: introduce bpf_oom_kill_process() bpf kfunc Roman Gushchin
2025-04-28 3:36 ` [PATCH rfc 05/12] mm: introduce bpf kfuncs to deal with memcg pointers Roman Gushchin
2025-04-28 3:36 ` [PATCH rfc 06/12] mm: introduce bpf_get_root_mem_cgroup() bpf kfunc Roman Gushchin
2025-04-28 3:36 ` [PATCH rfc 07/12] bpf: selftests: introduce read_cgroup_file() helper Roman Gushchin
2025-04-28 3:36 ` [PATCH rfc 08/12] bpf: selftests: bpf OOM handler test Roman Gushchin
2025-04-28 3:36 ` [PATCH rfc 09/12] sched: psi: bpf hook to handle psi events Roman Gushchin
2025-04-28 6:11 ` kernel test robot
2025-04-30 0:28 ` Suren Baghdasaryan
2025-04-30 0:58 ` Roman Gushchin [this message]
2025-04-28 3:36 ` [PATCH rfc 10/12] mm: introduce bpf_out_of_memory() bpf kfunc Roman Gushchin
2025-04-29 11:46 ` Michal Hocko
2025-04-29 21:31 ` Roman Gushchin
2025-04-30 7:27 ` Michal Hocko
2025-04-30 14:53 ` Roman Gushchin
2025-05-05 8:08 ` Michal Hocko
2025-04-28 3:36 ` [PATCH rfc 11/12] bpf: selftests: introduce open_cgroup_file() helper Roman Gushchin
2025-04-28 3:36 ` [PATCH rfc 12/12] bpf: selftests: psi handler test Roman Gushchin
2025-04-28 10:43 ` [PATCH rfc 00/12] mm: BPF OOM Matt Bobrowski
2025-04-28 17:24 ` Roman Gushchin
2025-04-29 1:56 ` Kumar Kartikeya Dwivedi
2025-04-29 15:42 ` Roman Gushchin
2025-05-02 17:26 ` Song Liu
2025-04-29 11:42 ` Michal Hocko
2025-04-29 14:44 ` Roman Gushchin
2025-04-29 21:56 ` Suren Baghdasaryan
2025-04-29 22:17 ` Roman Gushchin
2025-04-29 23:01 ` Suren Baghdasaryan
2025-04-29 22:44 ` Suren Baghdasaryan
2025-04-29 23:01 ` Roman Gushchin
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