netdev - Re: [RFC Patch bpf-next] bpf: introduce bpf timer

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Message-ID: <CAM_iQpXrnXU85J=fa5+QjRqgo_evGfkfLU9_-aVdoyM_DJU2nA@mail.gmail.com>
Date:   Mon, 5 Apr 2021 16:49:28 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Song Liu <songliubraving@...com>
Cc:     "open list:BPF (Safe dynamic programs and tools)" 
        <netdev@...r.kernel.org>,
        "open list:BPF (Safe dynamic programs and tools)" 
        <bpf@...r.kernel.org>,
        "duanxiongchun@...edance.com" <duanxiongchun@...edance.com>,
        "wangdongdong.6@...edance.com" <wangdongdong.6@...edance.com>,
        Muchun Song <songmuchun@...edance.com>,
        Cong Wang <cong.wang@...edance.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Yonghong Song <yhs@...com>
Subject: Re: [RFC Patch bpf-next] bpf: introduce bpf timer

On Fri, Apr 2, 2021 at 4:31 PM Song Liu <songliubraving@...com> wrote:
>
>
>
> > On Apr 2, 2021, at 1:57 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> >
> > Ideally I even prefer to create timers in kernel-space too, but as I already
> > explained, this seems impossible to me.
>
> Would hrtimer (include/linux/hrtimer.h) work?

By impossible, I meant it is impossible (to me) to take a refcnt to the callback
prog if we create the timer in kernel-space. So, hrtimer is the same in this
perspective.

Thanks.