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From: Steven Rostedt <rostedt@goodmis.org>
To: Alexei Starovoitov <ast@fb.com>
Cc: <davem@davemloft.net>, <daniel@iogearbox.net>,
	<torvalds@linux-foundation.org>, <peterz@infradead.org>,
	<netdev@vger.kernel.org>, <kernel-team@fb.com>,
	<linux-api@vger.kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH v6 bpf-next 08/11] bpf: introduce BPF_RAW_TRACEPOINT
Date: Tue, 27 Mar 2018 13:11:43 -0400	[thread overview]
Message-ID: <20180327131143.4b83534c@gandalf.local.home> (raw)
In-Reply-To: <20180327130211.284c8924@gandalf.local.home>

On Tue, 27 Mar 2018 13:02:11 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> Honestly, I think this is too much of a short cut and a hack. I know
> you want to keep it "simple" and save space, but you really should do
> it the same way ftrace and perf do it. That is, create a section and
> have all tracepoints create a structure that holds a pointer to the
> tracepoint and to the bpf probe function. Then you don't even need the
> kernel_tracepoint_find_by_name(), you just iterate over your table and
> you get the tracepoint and the bpf function associated to it.

Also, if you do it the perf/ftrace way, you get support for module
tracepoints pretty much for free. Which would include tracepoints in
networking code that is loaded by a module.

-- Steve

WARNING: multiple messages have this Message-ID (diff)
From: Steven Rostedt <rostedt@goodmis.org>
To: Alexei Starovoitov <ast@fb.com>
Cc: davem@davemloft.net, daniel@iogearbox.net,
	torvalds@linux-foundation.org, peterz@infradead.org,
	netdev@vger.kernel.org, kernel-team@fb.com,
	linux-api@vger.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH v6 bpf-next 08/11] bpf: introduce BPF_RAW_TRACEPOINT
Date: Tue, 27 Mar 2018 13:11:43 -0400	[thread overview]
Message-ID: <20180327131143.4b83534c@gandalf.local.home> (raw)
In-Reply-To: <20180327130211.284c8924@gandalf.local.home>

On Tue, 27 Mar 2018 13:02:11 -0400
Steven Rostedt <rostedt@goodmis.org> wrote:

> Honestly, I think this is too much of a short cut and a hack. I know
> you want to keep it "simple" and save space, but you really should do
> it the same way ftrace and perf do it. That is, create a section and
> have all tracepoints create a structure that holds a pointer to the
> tracepoint and to the bpf probe function. Then you don't even need the
> kernel_tracepoint_find_by_name(), you just iterate over your table and
> you get the tracepoint and the bpf function associated to it.

Also, if you do it the perf/ftrace way, you get support for module
tracepoints pretty much for free. Which would include tracepoints in
networking code that is loaded by a module.

-- Steve

  reply	other threads:[~2018-03-27 17:11 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-27  2:46 [PATCH v6 bpf-next 00/11] bpf, tracing: introduce bpf raw tracepoints Alexei Starovoitov
2018-03-27  2:46 ` Alexei Starovoitov
2018-03-27  2:46 ` [PATCH v6 bpf-next 01/11] treewide: remove large struct-pass-by-value from tracepoint arguments Alexei Starovoitov
2018-03-27  2:46   ` Alexei Starovoitov
2018-03-27  2:46 ` [PATCH v6 bpf-next 02/11] net/mediatek: disambiguate mt76 vs mt7601u trace events Alexei Starovoitov
2018-03-27  2:46   ` Alexei Starovoitov
2018-03-27  2:46 ` [PATCH v6 bpf-next 03/11] net/mac802154: disambiguate mac80215 vs mac802154 " Alexei Starovoitov
2018-03-27  2:46   ` Alexei Starovoitov
2018-03-27  2:46 ` [PATCH v6 bpf-next 04/11] net/wireless/iwlwifi: fix iwlwifi_dev_ucode_error tracepoint Alexei Starovoitov
2018-03-27  2:46   ` Alexei Starovoitov
2018-03-27  2:47 ` [PATCH v6 bpf-next 05/11] macro: introduce COUNT_ARGS() macro Alexei Starovoitov
2018-03-27  2:47   ` Alexei Starovoitov
2018-03-27  2:47 ` [PATCH v6 bpf-next 06/11] tracepoint: compute num_args at build time Alexei Starovoitov
2018-03-27  2:47   ` Alexei Starovoitov
2018-03-27 15:15   ` Steven Rostedt
2018-03-27 15:15     ` Steven Rostedt
2018-03-27  2:47 ` [PATCH v6 bpf-next 07/11] tracepoint: introduce kernel_tracepoint_find_by_name Alexei Starovoitov
2018-03-27  2:47   ` Alexei Starovoitov
2018-03-27 14:07   ` Steven Rostedt
2018-03-27 14:07     ` Steven Rostedt
2018-03-27 14:18     ` Mathieu Desnoyers
2018-03-27 14:42       ` Steven Rostedt
2018-03-27 15:53         ` Alexei Starovoitov
2018-03-27 16:09           ` Mathieu Desnoyers
2018-03-27 16:36           ` Daniel Borkmann
2018-03-27  2:47 ` [PATCH v6 bpf-next 08/11] bpf: introduce BPF_RAW_TRACEPOINT Alexei Starovoitov
2018-03-27  2:47   ` Alexei Starovoitov
2018-03-27 17:02   ` Steven Rostedt
2018-03-27 17:02     ` Steven Rostedt
2018-03-27 17:11     ` Steven Rostedt [this message]
2018-03-27 17:11       ` Steven Rostedt
2018-03-27 18:58       ` Steven Rostedt
2018-03-27 18:58         ` Steven Rostedt
2018-03-27 21:04         ` Steven Rostedt
2018-03-27 21:04           ` Steven Rostedt
2018-03-27 22:48           ` Alexei Starovoitov
2018-03-27 22:48             ` Alexei Starovoitov
2018-03-27 23:13             ` Mathieu Desnoyers
2018-03-28  0:00               ` Alexei Starovoitov
2018-03-28  0:44                 ` Mathieu Desnoyers
2018-03-28  0:51                   ` Alexei Starovoitov
2018-03-28 14:06                     ` Steven Rostedt
2018-03-27 18:45     ` Alexei Starovoitov
2018-03-27 18:45       ` Alexei Starovoitov
2018-03-27 19:00       ` Steven Rostedt
2018-03-27 19:00         ` Steven Rostedt
2018-03-27 19:07         ` Steven Rostedt
2018-03-27 19:07           ` Steven Rostedt
2018-03-27 19:10         ` Steven Rostedt
2018-03-27 19:10           ` Steven Rostedt
2018-03-27 19:10         ` Mathieu Desnoyers
2018-03-27  2:47 ` [PATCH v6 bpf-next 09/11] libbpf: add bpf_raw_tracepoint_open helper Alexei Starovoitov
2018-03-27  2:47   ` Alexei Starovoitov
2018-03-27  2:47 ` [PATCH v6 bpf-next 10/11] samples/bpf: raw tracepoint test Alexei Starovoitov
2018-03-27  2:47   ` Alexei Starovoitov
2018-03-27  2:47 ` [PATCH v6 bpf-next 11/11] selftests/bpf: test for bpf_get_stackid() from raw tracepoints Alexei Starovoitov
2018-03-27  2:47   ` Alexei Starovoitov

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