From: Rafael David Tinoco <rafaeldtinoco@gmail.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH bpf-next v5] libbpf: introduce legacy kprobe events support
Date: Tue, 14 Sep 2021 02:02:59 -0300 [thread overview]
Message-ID: <1EEF48CB-0164-40B3-8D56-06EDDAFC5B1E@gmail.com> (raw)
In-Reply-To: <CAEf4BzYpyuw4Bw5+Avx_qmNyrRqgXKRH+MJQ91CPLv9ftBhLhg@mail.gmail.com>
>> Allow kprobe tracepoint events creation through legacy interface, as the
>> kprobe dynamic PMUs support, used by default, was only created in v4.17.
>>
>> After commit "bpf: implement minimal BPF perf link", it was allowed that
>> some extra - to the link - information is accessed through container_of
>> struct bpf_link. This allows the tracing perf event legacy name, and
>> information whether it is a retprobe, to be saved outside bpf_link
>> structure, which would not be optimal.
>>
>> This enables CO-RE support for older kernels.
>>
>> Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>
>> Signed-off-by: Rafael David Tinoco <rafaeldtinoco@gmail.com>
>> ---
>
> I've adjusted the commit message a bit (this has nothing to do with
> CO-RE per se, so I dropped that, for example). Also see my comments
> below, I've applied all that to your patch while applying, please
> check them out.
Thanks. I'm assuming you don't need a v6 based on your adjustment comments, let me know if you do please.
...
>>
>> - if (ioctl(perf_link->perf_event_fd, PERF_EVENT_IOC_DISABLE, 0) < 0)
>> - err = -errno;
>> + ioctl(perf_link->perf_event_fd, PERF_EVENT_IOC_DISABLE, 0);
>
> what's the reason for dropping the error check? I kept it, but please
> let me know if there is any reason to drop it
From: _perf_ioctl() -> case PERF_EVENT_IOC_DISABLE: func = _perf_event_disable;
_perf_ioctl() will always return 0 and func is void (*func)(struct perf_event *).
next prev parent reply other threads:[~2021-09-14 5:03 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-30 5:33 [PATCH v3 bpf-next 00/14] BPF perf link and user-provided bpf_cookie Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 01/14] bpf: refactor BPF_PROG_RUN into a function Andrii Nakryiko
2021-07-30 17:19 ` Yonghong Song
2021-08-09 22:43 ` Daniel Borkmann
2021-08-10 0:28 ` Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 02/14] bpf: refactor BPF_PROG_RUN_ARRAY family of macros into functions Andrii Nakryiko
2021-08-09 23:00 ` Daniel Borkmann
2021-08-10 0:36 ` Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 03/14] bpf: refactor perf_event_set_bpf_prog() to use struct bpf_prog input Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 04/14] bpf: implement minimal BPF perf link Andrii Nakryiko
2021-07-30 17:24 ` Yonghong Song
2021-07-30 5:34 ` [PATCH v3 bpf-next 05/14] bpf: allow to specify user-provided bpf_cookie for BPF perf links Andrii Nakryiko
2021-07-30 22:02 ` Yonghong Song
2021-08-09 23:30 ` Daniel Borkmann
2021-08-10 0:52 ` Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 06/14] bpf: add bpf_get_attach_cookie() BPF helper to access bpf_cookie value Andrii Nakryiko
2021-07-30 22:13 ` Yonghong Song
2021-07-30 5:34 ` [PATCH v3 bpf-next 07/14] libbpf: re-build libbpf.so when libbpf.map changes Andrii Nakryiko
2021-07-30 22:31 ` Yonghong Song
2021-07-30 5:34 ` [PATCH v3 bpf-next 08/14] libbpf: remove unused bpf_link's destroy operation, but add dealloc Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 09/14] libbpf: use BPF perf link when supported by kernel Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 10/14] libbpf: add bpf_cookie support to bpf_link_create() API Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 11/14] libbpf: add bpf_cookie to perf_event, kprobe, uprobe, and tp attach APIs Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 12/14] selftests/bpf: test low-level perf BPF link API Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 13/14] selftests/bpf: extract uprobe-related helpers into trace_helpers.{c,h} Andrii Nakryiko
2021-07-30 5:34 ` [PATCH v3 bpf-next 14/14] selftests/bpf: add bpf_cookie selftests for high-level APIs Andrii Nakryiko
2021-08-01 5:11 ` [PATCH bpf-next v4] libbpf: introduce legacy kprobe events support Rafael David Tinoco
2021-08-06 22:29 ` Andrii Nakryiko
2021-09-12 6:48 ` [PATCH bpf-next v5] " Rafael David Tinoco
2021-09-12 6:52 ` Rafael David Tinoco
2021-09-14 4:44 ` Andrii Nakryiko
2021-09-14 5:02 ` Rafael David Tinoco [this message]
2021-09-14 5:21 ` Andrii Nakryiko
2021-09-14 14:27 ` sunyucong
2021-09-14 15:42 ` Rafael David Tinoco
2021-09-14 20:34 ` [PATCH bpf-next] libbpf: fix build error introduced by legacy kprobe feature Rafael David Tinoco
2021-09-14 21:04 ` Alexei Starovoitov
2021-09-14 21:35 ` [PATCH bpf-next v2] " Rafael David Tinoco
2021-09-14 21:39 ` Rafael David Tinoco
2021-09-14 21:48 ` Andrii Nakryiko
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