Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18;
MIME-Version: 1.0
References: <20220225234339.2386398-1-haoluo@google.com> <20220225234339.2386398-5-haoluo@google.com>
 <c323bce9-a04e-b1c3-580a-783fde259d60@fb.com>
In-Reply-To: <c323bce9-a04e-b1c3-580a-783fde259d60@fb.com>
From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date:   Wed, 2 Mar 2022 13:30:28 -0800
Message-ID: <CAADnVQ+q0vF03cH8w0c50XMZU1yf_0UjZ+ZarQ_RqMQrVpOFPA@mail.gmail.com>
Subject: Re: [PATCH bpf-next v1 4/9] bpf: Introduce sleepable tracepoints
To:     Yonghong Song <yhs@fb.com>
Cc:     Hao Luo <haoluo@google.com>, Alexei Starovoitov <ast@kernel.org>,
        Andrii Nakryiko <andrii@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>,
        KP Singh <kpsingh@kernel.org>,
        Shakeel Butt <shakeelb@google.com>,
        Joe Burton <jevburton.kernel@gmail.com>,
        Tejun Heo <tj@kernel.org>, joshdon@google.com,
        Stanislav Fomichev <sdf@google.com>, bpf <bpf@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Wed, Mar 2, 2022 at 1:23 PM Yonghong Song <yhs@fb.com> wrote:
>
>
>
> On 2/25/22 3:43 PM, Hao Luo wrote:
> > Add a new type of bpf tracepoints: sleepable tracepoints, which allows
> > the handler to make calls that may sleep. With sleepable tracepoints, a
> > set of syscall helpers (which may sleep) may also be called from
> > sleepable tracepoints.
>
> There are some old discussions on sleepable tracepoints, maybe
> worthwhile to take a look.
>
> https://lore.kernel.org/bpf/20210218222125.46565-5-mjeanson@efficios.com/T/

Right. It's very much related, but obsolete too.
We don't need any of that for sleeptable _raw_ tps.
I prefer to stay with "sleepable" name as well to
match the rest of the bpf sleepable code.
In all cases it's faultable.