From: Yonghong Song <yhs@fb.com>
To: Hao Luo <haoluo@google.com>, Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>
Cc: 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, sdf@google.com, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH bpf-next v1 4/9] bpf: Introduce sleepable tracepoints
Date: Wed, 2 Mar 2022 13:23:35 -0800 [thread overview]
Message-ID: <c323bce9-a04e-b1c3-580a-783fde259d60@fb.com> (raw)
In-Reply-To: <20220225234339.2386398-5-haoluo@google.com>
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/
>
> In the following patches, we will whitelist some tracepoints to be
> sleepable.
>
> Signed-off-by: Hao Luo <haoluo@google.com>
> ---
> include/linux/bpf.h | 10 +++++++-
> include/linux/tracepoint-defs.h | 1 +
> include/trace/bpf_probe.h | 22 ++++++++++++++----
> kernel/bpf/syscall.c | 41 +++++++++++++++++++++++----------
> kernel/trace/bpf_trace.c | 5 ++++
> 5 files changed, 61 insertions(+), 18 deletions(-)
>
> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> index c36eeced3838..759ade7b24b3 100644
> --- a/include/linux/bpf.h
> +++ b/include/linux/bpf.h
> @@ -1810,6 +1810,9 @@ struct bpf_prog *bpf_prog_by_id(u32 id);
> struct bpf_link *bpf_link_by_id(u32 id);
>
> const struct bpf_func_proto *bpf_base_func_proto(enum bpf_func_id func_id);
> +const struct bpf_func_proto *
> +tracing_prog_syscall_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog);
> +
> void bpf_task_storage_free(struct task_struct *task);
> bool bpf_prog_has_kfunc_call(const struct bpf_prog *prog);
> const struct btf_func_model *
> @@ -1822,7 +1825,6 @@ struct bpf_core_ctx {
>
> int bpf_core_apply(struct bpf_core_ctx *ctx, const struct bpf_core_relo *relo,
> int relo_idx, void *insn);
> -
> #else /* !CONFIG_BPF_SYSCALL */
> static inline struct bpf_prog *bpf_prog_get(u32 ufd)
> {
> @@ -2011,6 +2013,12 @@ bpf_base_func_proto(enum bpf_func_id func_id)
> return NULL;
> }
>
> +static inline struct bpf_func_proto *
> +tracing_prog_syscall_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
> +{
> + return NULL;
> +}
> +
> static inline void bpf_task_storage_free(struct task_struct *task)
> {
> }
> diff --git a/include/linux/tracepoint-defs.h b/include/linux/tracepoint-defs.h
> index e7c2276be33e..c73c7ab3680e 100644
> --- a/include/linux/tracepoint-defs.h
> +++ b/include/linux/tracepoint-defs.h
> @@ -51,6 +51,7 @@ struct bpf_raw_event_map {
> void *bpf_func;
> u32 num_args;
> u32 writable_size;
> + u32 sleepable;
> } __aligned(32);
>
> /*
[...]
next prev parent reply other threads:[~2022-03-02 21:24 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-25 23:43 [PATCH bpf-next v1 0/9] Extend cgroup interface with bpf Hao Luo
2022-02-25 23:43 ` [PATCH bpf-next v1 1/9] bpf: Add mkdir, rmdir, unlink syscalls for prog_bpf_syscall Hao Luo
2022-02-27 5:18 ` Kumar Kartikeya Dwivedi
2022-02-28 22:10 ` Hao Luo
2022-03-02 19:34 ` Alexei Starovoitov
2022-03-03 18:50 ` Hao Luo
2022-03-04 18:37 ` Hao Luo
2022-03-05 23:47 ` Alexei Starovoitov
2022-03-08 21:08 ` Hao Luo
2022-03-02 20:55 ` Yonghong Song
2022-03-03 18:56 ` Hao Luo
2022-03-03 19:13 ` Yonghong Song
2022-03-03 19:15 ` Hao Luo
2022-03-12 3:46 ` Al Viro
2022-03-14 17:07 ` Hao Luo
2022-03-14 23:10 ` Al Viro
2022-03-15 17:27 ` Hao Luo
2022-03-15 18:59 ` Alexei Starovoitov
2022-03-15 19:03 ` Alexei Starovoitov
2022-03-15 19:00 ` Al Viro
2022-03-15 19:47 ` Hao Luo
2022-02-25 23:43 ` [PATCH bpf-next v1 2/9] bpf: Add BPF_OBJ_PIN and BPF_OBJ_GET in the bpf_sys_bpf helper Hao Luo
2022-02-25 23:43 ` [PATCH bpf-next v1 3/9] selftests/bpf: tests mkdir, rmdir, unlink and pin in syscall Hao Luo
2022-02-25 23:43 ` [PATCH bpf-next v1 4/9] bpf: Introduce sleepable tracepoints Hao Luo
2022-03-02 19:41 ` Alexei Starovoitov
2022-03-03 19:37 ` Hao Luo
2022-03-03 19:59 ` Alexei Starovoitov
2022-03-02 21:23 ` Yonghong Song [this message]
2022-03-02 21:30 ` Alexei Starovoitov
2022-03-03 1:08 ` Yonghong Song
2022-03-03 2:29 ` Alexei Starovoitov
2022-03-03 19:43 ` Hao Luo
2022-03-03 20:02 ` Alexei Starovoitov
2022-03-03 20:04 ` Alexei Starovoitov
2022-03-03 22:06 ` Hao Luo
2022-02-25 23:43 ` [PATCH bpf-next v1 5/9] cgroup: Sleepable cgroup tracepoints Hao Luo
2022-02-25 23:43 ` [PATCH bpf-next v1 6/9] libbpf: Add sleepable tp_btf Hao Luo
2022-02-25 23:43 ` [PATCH bpf-next v1 7/9] bpf: Lift permission check in __sys_bpf when called from kernel Hao Luo
2022-03-02 20:01 ` Alexei Starovoitov
2022-03-03 19:14 ` Hao Luo
2022-02-25 23:43 ` [PATCH bpf-next v1 8/9] bpf: Introduce cgroup iter Hao Luo
2022-02-26 2:32 ` kernel test robot
2022-02-26 2:32 ` kernel test robot
2022-02-26 2:53 ` kernel test robot
2022-03-02 21:59 ` Yonghong Song
2022-03-03 20:02 ` Hao Luo
2022-03-02 22:45 ` Kumar Kartikeya Dwivedi
2022-03-03 2:03 ` Yonghong Song
2022-03-03 3:03 ` Kumar Kartikeya Dwivedi
2022-03-03 4:00 ` Alexei Starovoitov
2022-03-03 7:33 ` Yonghong Song
2022-03-03 8:13 ` Kumar Kartikeya Dwivedi
2022-03-03 21:52 ` Hao Luo
2022-02-25 23:43 ` [PATCH bpf-next v1 9/9] selftests/bpf: Tests using sleepable tracepoints to monitor cgroup events Hao Luo
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