linux-kernel - Re: [PATCH v1 13/14] sched: psi: implement bpf_psi_create

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Message-ID: <87h5xvxru3.fsf@linux.dev>
Date: Mon, 25 Aug 2025 09:56:52 -0700
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Martin KaFai Lau <martin.lau@...ux.dev>
Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>,  linux-mm@...ck.org,
  bpf@...r.kernel.org,  Suren Baghdasaryan <surenb@...gle.com>,  Johannes
 Weiner <hannes@...xchg.org>,  Michal Hocko <mhocko@...e.com>,  David
 Rientjes <rientjes@...gle.com>,  Matt Bobrowski
 <mattbobrowski@...gle.com>,  Song Liu <song@...nel.org>,  Kumar Kartikeya
 Dwivedi <memxor@...il.com>,  Alexei Starovoitov <ast@...nel.org>,  Andrew
 Morton <akpm@...ux-foundation.org>,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 13/14] sched: psi: implement bpf_psi_create_trigger()
 kfunc

Martin KaFai Lau <martin.lau@...ux.dev> writes:

> On 8/20/25 5:36 PM, Roman Gushchin wrote:
>> It will. Idk how big of a problem it is, given that the caller needs
>> a trusted reference to bpf_psi. Also, is there a simple way to constrain
>> it? Wdyt?
>
> The bpf qdisc has the kfunc filtering. Take a look at the
> bpf_qdisc_kfunc_filter in bpf_qdisc.c.

Thanks! I'll take a look.