linux-kernel - Re: [RFC PATCH v2 1/5] mm, oom: Introduce bpf_oom_evaluate

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Message-ID: <cd33ccb9-9f17-4c27-b963-87bc22d4d490@vivo.com>
Date:   Wed, 13 Sep 2023 19:24:03 +0800
From:   Bixuan Cui <cuibixuan@...o.com>
To:     Chuyi Zhou <zhouchuyi@...edance.com>, hannes@...xchg.org,
        mhocko@...nel.org, roman.gushchin@...ux.dev, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, muchun.song@...ux.dev
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        wuyun.abel@...edance.com, robin.lu@...edance.com,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [RFC PATCH v2 1/5] mm, oom: Introduce bpf_oom_evaluate_task



在 2023/8/10 16:13, Chuyi Zhou 写道:
> + +__weak noinline int bpf_oom_evaluate_task(struct task_struct *task, 
> struct oom_control *oc) +{ + return NO_BPF_POLICY; +} + 
> +BTF_SET8_START(oom_bpf_fmodret_ids) +BTF_ID_FLAGS(func, 
> bpf_oom_evaluate_task) +BTF_SET8_END(oom_bpf_fmodret_ids)
I have a question here, why use __weak? Is there other modules that can 
redefine bpf_oom_evaluate_task? why not use __bpf_kfunc 
(Documentation/bpf/kfuncs.rst) ?

Thanks
Bixuan Cui