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From: Steven Rostedt <rostedt@goodmis.org>
To: Beau Belgrave <beaub@linux.microsoft.com>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-trace-kernel@vger.kernel.org,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>, bpf <bpf@vger.kernel.org>,
	David Vernet <void@manifault.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	dthaler@microsoft.com, brauner@kernel.org, hch@infradead.org
Subject: Re: [PATCH] tracing/user_events: Run BPF program if attached
Date: Mon, 15 May 2023 17:57:12 -0400	[thread overview]
Message-ID: <20230515175712.649aa5f6@gandalf.local.home> (raw)
In-Reply-To: <20230515192407.GA85@W11-BEAU-MD.localdomain>

On Mon, 15 May 2023 12:24:07 -0700
Beau Belgrave <beaub@linux.microsoft.com> wrote:

> > Beau,
> > please provide a detailed explanation of your use case and how bpf helps.
> >   
> 
> There are teams that have existing BPF programs that want to also pull
> in data from user processes in addition to the data they already collect
> from the kernel.
> 
> We are also seeing a trend of teams wanting to drop buffering approaches
> and move into non-buffered analysis of problems. An example is as soon
> as a fault happens in a user-process, they would like the ability to see
> what that thread has done, what the kernel did a bit before the error
> (or other processes that have swapped in, etc).
> 
> We also have needs to aggregate operation duration live, and as soon as
> they deviate, trigger corrective actions. BPF is ideal for us to use for
> aggregating data cheaply, comparing that to other kernel and user
> processes, and then making a decision quickly on how to mitigate or flag
> it. We are working with OpenTelemetry teams to make this work via
> certain exporters in various languages (C#/C++/Rust).

This is turning into a very productive discussion. Thank you Alexei and
Beau for this.

Beau,

Could you possibly also add (in a separate patch), a simple use case of a
BPF program that would be attached to some user event. Could be contrived.
Perhaps supply a patch to ls.c[1] that adds a user event to where it reads a
file type and the bpf program can do something special if the file belongs
to the user. OK, I'm just pulling crazy ideas out of thin air!

[1] https://github.com/coreutils/coreutils/blob/master/src/ls.c

Could copy the ls with the user event to the samples directory for user
events. It is GPL.

-- Steve

  reply	other threads:[~2023-05-15 21:57 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-08 16:37 [PATCH] tracing/user_events: Run BPF program if attached Beau Belgrave
2023-05-09 15:24 ` Alexei Starovoitov
2023-05-09 17:01   ` Steven Rostedt
2023-05-09 20:30     ` Steven Rostedt
2023-05-09 20:42       ` Steven Rostedt
2023-05-15 16:57       ` Alexei Starovoitov
2023-05-15 18:33         ` Steven Rostedt
2023-05-15 19:35           ` Beau Belgrave
2023-05-15 21:38             ` Steven Rostedt
2023-05-15 19:24         ` Beau Belgrave
2023-05-15 21:57           ` Steven Rostedt [this message]
2023-05-17  0:36           ` Alexei Starovoitov
2023-05-17  0:56             ` Linus Torvalds
2023-05-17  1:46               ` Linus Torvalds
2023-05-17  2:29                 ` Steven Rostedt
2023-05-17  3:03                   ` Linus Torvalds
2023-05-17 17:22                     ` Beau Belgrave
2023-05-17 18:15                       ` Linus Torvalds
2023-05-17 19:07                         ` Beau Belgrave
2023-05-17 19:26                           ` Linus Torvalds
2023-05-17 19:36                             ` Beau Belgrave
2023-05-17 19:36                             ` Linus Torvalds
2023-05-17 19:37                               ` Linus Torvalds
2023-05-17 23:00                                 ` Beau Belgrave
2023-05-17 23:14                                   ` Linus Torvalds
2023-05-17 23:25                                     ` Steven Rostedt
2023-05-18  0:14                                       ` Beau Belgrave
2023-05-18  0:23                                         ` Linus Torvalds
2023-05-17 20:08                               ` Linus Torvalds
2023-05-17  1:26             ` Steven Rostedt
2023-05-17 16:50               ` Beau Belgrave
2023-05-18  0:10                 ` Alexei Starovoitov
2023-05-18  0:19                   ` Beau Belgrave
2023-05-18  0:56                     ` Alexei Starovoitov
2023-05-18  1:18                       ` Beau Belgrave
2023-05-18  2:08                         ` Steven Rostedt
2023-05-18  3:14                           ` Alexei Starovoitov
2023-05-18 13:36                             ` Steven Rostedt
2023-05-18 17:28                               ` Beau Belgrave
2023-06-01  9:46                   ` Christian Brauner
2023-06-01 15:24                     ` Beau Belgrave
2023-06-01 15:57                       ` Christian Brauner
2023-06-01 16:29                         ` Beau Belgrave
2023-06-06 13:37                           ` Masami Hiramatsu
2023-06-06 17:05                             ` Beau Belgrave
2023-06-07 14:07                               ` Masami Hiramatsu
2023-06-07 19:26                                 ` Beau Belgrave
2023-06-08  0:25                                   ` Masami Hiramatsu
2023-05-17 17:51             ` Beau Belgrave
2023-06-06 13:57             ` Masami Hiramatsu
2023-06-06 16:57               ` Andrii Nakryiko
2023-06-06 20:57                 ` Beau Belgrave

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